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A full implementation of UCSD p-System IV.0 for RomWBW. Derived from the official Z80 Adaptable p-System. My first real programming was on this system. So many memories...patch v3.1.1-pre.192
Wayne Warthen
3 years ago
32 changed files with 1170 additions and 16 deletions
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@ -0,0 +1,37 @@ |
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@echo off |
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setlocal |
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|
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set TOOLS=../../Tools |
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|
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set PATH=%TOOLS%\tasm32;%PATH% |
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|
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set TASMTABS=%TOOLS%\tasm32 |
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|
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echo. |
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echo Building p-System Loader for RomWBW... |
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echo. |
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tasm -t80 -g3 loader.asm loader.bin loader.lst || exit /b |
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if errorlevel 1 goto :eof |
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|
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echo. |
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echo Building p-System BIOS for RomWBW... |
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echo. |
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tasm -t80 -g3 bios.asm bios.bin bios.lst || exit /b |
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if errorlevel 1 goto :eof |
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|
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::echo. |
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::echo Creating p-System BIOS Tester boot image |
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::echo. |
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::copy /b loader.bin + bios.bin + biostest.dat psys.bin |
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|
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echo. |
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echo Generating p-System Boot Track... |
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echo. |
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copy /b loader.bin + bios.bin + boot.dat + fill.dat trk0.bin || exit /b |
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|
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echo. |
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echo Generating p-System Disk Image... |
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echo. |
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copy /b trk0.bin + psys.vol + trk0.bin + blank.vol psys.img || exit /b |
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|
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copy psys.img ..\..\Binary || exit /b |
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@ -0,0 +1,6 @@ |
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@echo off |
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setlocal |
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|
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if exist *.bin del *.bin |
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if exist *.lst del *.lst |
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if exist *.img del *.img |
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@ -0,0 +1,11 @@ |
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OBJECTS = psys.img |
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TOOLS = ../../Tools |
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DEST = ../../Binary |
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OTHERS = *.bin *.lst *.img |
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include $(TOOLS)/Makefile.inc |
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|
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trk0.bin: loader.bin bios.bin boot.dat fill.dat |
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cat loader.bin bios.bin boot.dat fill.dat > trk0.bin |
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|
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psys.img: trk0.bin psys.vol blank.vol |
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cat trk0.bin psys.vol trk0.bin blank.vol > psys.img |
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@ -0,0 +1,100 @@ |
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This directory contains a port of p-System IV.0 for RomWBW. |
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|
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It was derived from the p-System Adaptable Z80 System. Unlike |
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some other distributions, this implements a native p-System |
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Z80 BIOS, it does not use a CP/M BIOS layer. |
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|
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Files: |
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|
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loader.asm p-System primary loader for RomWBW |
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bios.asm p-System BIOS for RomWBW HBIOS source (TASM) |
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biostest.dat binary image of SBIOSTESTER |
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boot.dat binary image of p-System bootstrap |
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psys.vol first (boot) slice, all p-System dist files |
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blank.vol a generic blank p-System volume |
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fill.dat used to complete the track 0 build (see below) |
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|
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Notes: |
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|
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This adatation runs on a single RomWBWW HBIOS hard disk |
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type device (CF Cart, SD Card, IDE drive, etc.). The |
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image built (psys.img) should be copied to your disk media |
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start at the first sector. You can then boot by selecting |
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the corresponding disk device unit number from the RomWBW |
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boot loader prompt. The p-System disk image (psys.img) is |
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entirely different from the RomWBW CP/M-style disk images. |
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|
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The boot device hard disk is broken up into 6 logical |
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p-System volumes. These are referred to as p-System |
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slices. A single RomWBW disk device can contain either |
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CP/M-style slices or p-System slices, but not both. |
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Each p-System slices is exactly 8 MB and support for |
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exactly 6 slices is provided. |
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|
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The first track of each volume contains all of the code |
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required to boot the p-System. However, the assignment |
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of the volumes is always in the order that the slices |
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appear physically on the hard disk device. Normally, |
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you would just boot to slice 0 from the RomWBW Boot |
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Loader. |
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|
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The first track contains the following: |
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- 4 sector p-System primary loader for RomWBW HBIOS |
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- 1 sector p-System BIOS for RomWBW HBIOS |
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- 4 sector p-System bootstrap |
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- 7 sector filler to complete a full track |
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|
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The p-System bootstrap is a binary image provided in the |
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p-System distribution. The loader and the BIOS are |
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custom for RomWBW and the source is provided here. |
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|
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The layout of the first track does not conform exactly to |
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the recommended p-System layout. The recommended layout |
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is not possible because it conflicts with the RomWBW |
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definition for a boot track. However, the changes are |
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simply slilghtly different sector assignments for the |
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different boot componets -- the general boot sequence |
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and mechanism for the p-System is completely standard. |
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|
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The logical disk geometry used by this p-System |
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adaptation is: |
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- 512 byte sector length |
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- 16 sectors per track |
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- 192 tracks per disk |
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|
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This layout does not occupy the full 8MB slice size |
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allocated. This is to allow for future expansion of |
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the filesystems. |
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|
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The p-System distribution includes a BIOS tester that |
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is provided as a binary image. This tester was used |
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to test the BIOS code in this adaptation. Note that |
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the tester fails for the BIOS as is. After a lot of |
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code tracing, a definite bug was identified in the |
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tester that exists for 512 byte sectors (which are |
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supported). When the BIOS is modified to use 128 or |
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256 byte sectors, the tester completes perfectly. |
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Significant use of the BIOS shows there are no issues |
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for a normal running system with 512 byte sectors. |
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|
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The boot disk provided here was constructed by simply |
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copying all of the content from the p-System distribution |
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disks onto the boot disk. SYSTEM.MISCINFO was updated |
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for an ANSI terminal. The GOTOXY routine in |
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SYSTEM.PASCAL was also updated for an ANSI terminal. |
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Note that the BIOS conwrit routine is hacked to add |
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a '[' to any output escape character. This is needed |
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because p-System has limited terminal escape sequence |
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handling configuration. |
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|
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At this time, there is no straightforward way to move |
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files in and out of the p-System volumes. There are |
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ways to do this, but they are complicated. Please |
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contact me if you are interested. |
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|
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There is currently no support for floppy drives. |
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|
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Wayne Warthen |
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wwarthen@gmail.com |
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|
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3:13 PM Thursday, January 12, 2023 |
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@ -0,0 +1,371 @@ |
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; |
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;----------------------------------------------------------------------- |
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; p-System BIOS for RomWBW HBIOS |
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; |
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;----------------------------------------------------------------------- |
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; |
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; 3:46 PM 1/13/2023 - WBW - Initial release |
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; |
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; TODO: |
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; |
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; - Assign the HBIOS console device to the p-System console instead |
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; of just using a hard-coded reference to Serial Unit 0. |
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; |
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; - Implement Extended BIOS. |
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; |
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|
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#include "../ver.inc" |
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; |
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#include "psys.inc" |
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; |
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#include "../HBIOS/hbios.inc" |
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; |
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; IORESULT values |
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; |
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ior_ok .equ 0 ; No error |
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ior_badblk .equ 1 ; Bad block, CRC error (parity) |
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ior_baddev .equ 2 ; Bad device number |
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ior_badio .equ 3 ; Illegal I/O request |
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ior_timout .equ 4 ; Data-com timeout |
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ior_offlin .equ 5 ; Volume is no longer on-line |
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ior_nofile .equ 6 ; File is no longer in directory |
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ior_filnamerr .equ 7 ; Illegal file name |
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ior_full .equ 8 ; No room; insufficient space on disk |
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ior_novol .equ 9 ; No such volume on-line |
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ior_notfnd .equ 10 ; No such file name in directory |
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ior_dupfil .equ 11 ; Duplicate file |
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ior_notclos .equ 12 ; Not closed: attempt to open an open file |
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ior_notopen .equ 13 ; Not open: attempt to access a closed file |
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ior_badfmt .equ 14 ; Bad format: error reading real or integer |
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ior_bufovr .equ 15 ; Ring buffer overflow |
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ior_diskwp .equ 16 ; Write attempt to protected disk |
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ior_blknumerr .equ 17 ; Illegal block number |
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ior_bufadrerr .equ 18 ; Illegal buffer address |
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ior_badsiz .equ 19 ; Bad text file size |
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; |
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; |
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; |
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.org bios_loc |
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; |
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; Simple BIOS vectors |
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jp sysinit ; 0: Initialize machine |
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jp syshalt ; 1: Exit UCSD Pascal |
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jp coninit ; 2: Console initialize |
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jp constat ; 3: Console status |
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jp conread ; 4: Console input |
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jp conwrit ; 5: Console output |
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jp setdisk ; 6: Set disk number |
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jp settrak ; 7: Set track number |
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jp setsect ; 8: Set sector number |
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jp setbufr ; 9: Set buffer address |
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jp dskread ; 10: Read sector from disk |
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jp dskwrit ; 11: Write sector to disk |
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jp dskinit ; 12: Reset disk |
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jp dskstrt ; 13: Activate disk |
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jp dskstop ; 14: De-activate disk |
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; |
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; Extended BIOS vectors |
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jp panic ; 15: Extended BIOS vector |
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jp panic ; 16: Extended BIOS vector |
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jp panic ; 17: Extended BIOS vector |
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jp panic ; 18: Extended BIOS vector |
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jp panic ; 19: Extended BIOS vector |
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jp panic ; 20: Extended BIOS vector |
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jp panic ; 21: Extended BIOS vector |
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jp panic ; 22: Extended BIOS vector |
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jp panic ; 23: Extended BIOS vector |
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jp panic ; 24: Extended BIOS vector |
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jp panic ; 25: Extended BIOS vector |
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jp panic ; 26: Extended BIOS vector |
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jp panic ; 27: Extended BIOS vector |
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; |
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; |
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; |
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sysinit: |
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;ld a,0 |
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;jp panic |
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|
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ld hl,str_banner |
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call prtstr |
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call conread |
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|
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ld b,BF_SYSGET ; HBIOS SysGet function |
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ld c,BF_SYSGET_BOOTINFO ; BootInfo sub-function |
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rst 08 ; do it, boot disk device unit in |
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ld a,d ; boot unit id returned in D |
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ld (hb_dev),a ; save for disk I/O |
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|
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; sysinit is being called twice during startup. Once from |
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; the bootstrap and then from the interpreter. So, we |
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; remap the vector here to avoid doing the above stuff |
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; multiple times. |
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ld hl,sysinit1 ; re-vector to sysinit1 |
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ld (bios_loc+1),hl ; update the jump table |
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|
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sysinit1: |
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xor a ; signal success |
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ret ; done |
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|
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syshalt: |
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;ld a,1 |
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;jp panic |
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|
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; The syshalt vector does not seem be to invoked when |
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; selecting the Halt option from the p-System menu. |
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; I have no idea why. |
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ld b,BF_SYSRESET ; HBIOS reset function |
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ld c,BF_SYSRES_WARM ; warm reset is fine |
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rst 08 ; do it |
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|
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; we should never get here |
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di ; interrupts off |
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halt ; ... and die |
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|
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|
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coninit: |
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;ld a,2 |
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;jp panic |
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|
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xor a ; signal success |
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ret ; done |
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|
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constat: |
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;ld a,3 |
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;jp panic |
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|
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ld b,BF_CIOIST ; serial port status function |
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ld c,0 ; port 0 |
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rst 08 ; call HBIOS |
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ld c,0 ; assume no chars pendin |
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jr z,constat1 ; if zero, no chars waiting |
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ld c,$FF ; signal char(s) pending |
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constat1: |
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xor a ; signal success |
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ret ; done |
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|
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conread: |
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;ld a,4 |
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;jp panic |
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|
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ld b,BF_CIOIN ; serial port read function |
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ld c,0 ; port 0 |
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rst 08 ; call HBIOS |
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ld c,e ; char to C |
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xor a ; signal success |
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ret ; done |
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|
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conwrit: |
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;ld a,5 |
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;jp panic |
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|
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ld a,c |
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cp 27 ; escape? |
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jr nz,conwrit1 ; if not, handle normally |
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call conwrit1 ; else, send escape |
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ld c,'[' ; ... followed by '[' for ANSI |
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conwrit1: |
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ld e,c ; char to write to E |
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ld b,BF_CIOOUT ; serial port write function |
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ld c,0 ; port 0 |
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rst 08 ; call HBIOS |
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xor a ; signal success |
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ret ; done |
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|
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setdisk: |
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;ld a,6 |
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;jp panic |
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|
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ld a,c ; disk number to A |
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ld (curdisk),a ; save for later |
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xor a ; signal success |
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ret ; done |
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|
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settrak: |
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;ld a,7 |
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;jp panic |
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|
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ld a,c ; track number to A |
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ld (curtrak),a ; save for later |
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xor a ; signal success |
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ret ; done |
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|
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setsect: |
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;ld a,8 |
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;jp panic |
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|
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ld a,c ; sector number to A |
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dec a ; from 1 indexed to 0 indexed |
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ld (cursect),a ; save for later |
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xor a ; signal success |
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ret |
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|
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setbufr: |
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;ld a,9 |
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;jp panic |
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|
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ld (curbufr),bc ; save buf adr for later |
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xor a ; signal success |
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ret ; done |
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|
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dskread: |
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;ld a,10 |
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;jp panic |
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|
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;ld a,(curdisk) |
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;cp 0 |
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;jr nz,dskinit1 |
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|
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call chkdisk |
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ret nz |
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|
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call seek |
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ret nz |
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|
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ld b,BF_DIOREAD ; HBIOS disk read function |
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ld a,(hb_dev) ; HBIOS disk unit |
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ld c,a ; ... goes in C |
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ld a,(HB_CURBNK) ; get current memory bank |
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ld d,a ; use as target bank for transfer |
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ld e,1 ; read 1 sector |
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ld hl,(curbufr) ; disk read buffer adr |
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rst 08 ; do it |
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ret z ; return if good read |
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ld a,ior_badblk ; else i/o error |
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ret ; done |
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|
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dskwrit: |
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;ld a,11 |
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;jp panic |
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|
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call chkdisk |
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ret nz |
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|
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call seek |
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ret nz |
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|
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ld b,BF_DIOWRITE ; HBIOS disk read function |
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ld a,(hb_dev) ; HBIOS disk unit |
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ld c,a ; ... goes in C |
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ld a,(HB_CURBNK) ; get current memory bank |
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ld d,a ; use as target bank for transfer |
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ld e,1 ; read 1 sector |
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ld hl,(curbufr) ; disk read buffer adr |
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rst 08 ; do it |
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ret z ; return if good read |
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ld a,ior_badblk ; else i/o error |
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ret ; done |
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|
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dskinit: |
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;ld a,12 |
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;jp panic |
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|
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call chkdisk |
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ret nz |
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|
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xor a ; signal success |
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ret ; done |
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|
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dskstrt: |
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;ld a,13 |
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;jp panic |
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|
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xor a ; signal success |
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ret ; done |
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|
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dskstop: |
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;ld a,14 |
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;jp panic |
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|
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xor a ; signal success |
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ret ; done |
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|
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chkdisk: |
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; Validate that curdisk is <= max supported |
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ld a,(curdisk) ; get current disk |
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cp disks ; compare to disk count |
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jr nc,chkdisk1 ; if too high, go to err |
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xor a ; signal success |
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ret ; done |
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chkdisk1: |
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ld a,ior_novol ; signal not online |
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or a |
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ret |
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|
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seek: |
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; A single physical HBIOS disk device will contain p-System |
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; volume slices. Each slice will be 8MB. Start by computing |
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; a track offset using the p-System disk number as an |
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; index. <Track Offset> = 8MB * <Disk Number> |
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; A track contains 0x20000 bytes: |
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; 512 (bytes per sec) * 16 (sec per trk) * 16 (hds per cyl) |
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; So, 8MB / 0x20000 = 0x40 tracks |
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ld hl,0 ; starting unit track offset |
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ld de,$0040 ; per disk track offset |
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ld a,(curdisk) ; get current disk |
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or a ; set flags |
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jr z,seek2 ; disk 0 needs no offset |
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ld b,a ; into B for loop counter |
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seek1: |
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add hl,de ; add another offset |
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djnz seek1 ; and loop as needed |
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seek2: |
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push hl ; save total track offset |
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ld a,(curtrak) ; get current track value |
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push af ; save track value |
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and $0F ; head is low 4 bits of track |
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ld d,a ; save in D for head |
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pop af ; recover original track value |
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rra ; rotate to remove head bits |
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rra |
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rra |
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rra |
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and $0F ; mask off other bits |
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ld l,a ; save in low byte of HL |
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ld h,0 ; zero out high byte of HL |
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ld a,(cursect) ; get sector |
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ld e,a ; put in E |
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pop bc |
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add hl,bc ; add track offset |
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ld b,BF_DIOSEEK ; HBIOS seek function |
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ld a,(hb_dev) ; HBIOS disk unit |
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ld c,a ; ... goes in C |
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rst 08 ; do it |
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ret z ; if no error, done |
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ld a,ior_badblk ; signal I/O error |
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ret ; done |
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|
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prtstr: |
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ld a,(hl) |
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or a |
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ret z |
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push hl |
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ld c,a |
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call conwrit |
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pop hl |
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inc hl |
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jr prtstr |
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|
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|
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panic: |
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di |
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halt |
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|
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|
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hb_dev .db 3 ; HBIOS disk device unit |
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; |
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curdisk .db 0 ; Current disk number |
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curtrak .db 0 ; Current track number |
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cursect .db 0 ; Current sector number |
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curbufr .dw 0 ; Current disk buffer address |
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; |
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str_banner .db 13,10,"RomWBW p-System BIOS v" |
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.db BIOSVER |
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.db 13,10,13,10 |
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.db "Press any key...",0 |
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; |
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; |
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; |
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.fill bios_end - $ |
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|
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; |
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.end |
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@ -0,0 +1,375 @@ |
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;=============================================================================== |
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; LOADER.ASM |
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; |
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; BOOTLOADER FOR ROMWBW PSYSTEM |
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; |
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; CP/M DISK FORMATS ALLOW FOR RESERVED TRACKS THAT CONTAIN AN IMAGE OF THE |
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; OPERATING SYSTEM TO BE LOADED WHEN THE DISK IS BOOTED. THE OPERATING SYSTEM |
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; IMAGE ITSELF IS NORMALLY PREFIXED BY A 1-N SECTORS CONTAINING OS BOOTSTRAP |
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; CODE AND DISK METADATA. |
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; |
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; THE RETROBREW COMPUTING GROUP HAS BEEN USING A CONVENTION OF PREFIXING THE |
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; OS IMAGE WITH 3 SECTORS (512 BYTES X 3 FOR A TOTAL OF 1536 BYTES): |
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; |
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; SECTOR 1: IBM-PC STYLE BOOT BLOCK CONTAINING BOOTSTRAP, |
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; PARTITION TABLE, AND BOOT SIGNATURE |
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; SECTOR 2: RESERVED |
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; SECTOR 3: METADATA |
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; |
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; THE HARDWARE BIOS IS EXPECTED TO READ AND LOAD THE FIRST TWO SECTORS FROM THE |
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; DISK TO MEMORY ADDRESS $8000 AND JUMP TO THAT LOCATION TO BEGIN THE BOOT |
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; PROCESS. THE BIOS IS EXPECTED TO VERIFY THAT A STANDARD BOOT SIGNATURE |
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; OF $55, $AA IS PRESENT AT OFFSET $1FE-$1FF. IF THE SIGNATURE IS NOT FOUND, |
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; THE BIOS SHOULD ASSUME THE DISK HAS NOT BEEN PROPERLY INITIALIZED AND SHOULD |
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; NOT JUMP TO THE LOAD ADDRESS. |
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; |
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;=============================================================================== |
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; |
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#INCLUDE "../ver.inc" |
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; |
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#INCLUDE "psys.inc" |
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; |
|||
SYS_ENT .EQU $0100 ; SYSTEM (OS) ENTRY POINT ADDRESS |
|||
SYS_LOC .EQU $0100 ; STARTING ADDRESS TO LOAD SYSTEM IMAGE |
|||
SYS_END .EQU $0100 + loader_size + bios_size + boot_size ; ENDING ADDRESS OF SYSTEM IMAGE |
|||
; |
|||
SEC_SIZE .EQU 512 ; DISK SECTOR SIZE |
|||
BLK_SIZE .EQU 128 ; OS BLOCK/RECORD SIZE |
|||
; |
|||
PREFIX_SIZE .EQU (SEC_SIZE * 3) ; 3 SECTORS |
|||
; |
|||
META_SIZE .EQU 32 ; SEE BELOW |
|||
META_LOC .EQU (PREFIX_SIZE - META_SIZE) |
|||
; |
|||
PT_LOC .EQU $1BE |
|||
PT_SIZ .EQU $40 |
|||
; |
|||
.ORG 0 |
|||
; |
|||
;------------------------------------------------------------------------------- |
|||
; SECTOR 1 |
|||
; |
|||
; THIS SECTOR FOLLOWS THE CONVENTIONS OF AN IBM-PC MBR CONTAINING THE OS |
|||
; BOOTSTRAP CODE, PARTITION TABLE, AND BOOT SIGNATURE |
|||
; |
|||
;---------------------------------------------------------------------------- |
|||
; |
|||
.FILL PT_LOC - $,0 ; FILL TO START OF PARTITION TABLE |
|||
; |
|||
; RESERVE SPACE FOR STANDARD IBM-PC PARTITION TABLE. ALTHOUGH A |
|||
; PARTITION TABLE IS NOT RELEVANT FOR A FLOPPY DISK, IT DOES NO HARM. |
|||
; THE CONTENTS OF THE PARTITION TABLE MUST BE MANAGED BY FDISK80. |
|||
; |
|||
PARTTBL .FILL PT_SIZ,0 ; PARTITION TABLE, FILL WITH ZEROES |
|||
; |
|||
; THE END OF THE FIRST SECTOR MUST CONTAIN THE TWO BYTE BOOT SIGNATURE. |
|||
; |
|||
BOOTSIG .DB $55,$AA ; STANDARD BOOT SIGNATURE |
|||
; |
|||
;------------------------------------------------------------------------------- |
|||
; SECTOR 2 |
|||
; |
|||
; THIS SECTOR HAS NOT BEEN DEFINED AND IS RESERVED. |
|||
; |
|||
;---------------------------------------------------------------------------- |
|||
; |
|||
.FILL SEC_SIZE,0 ; JUST FILL SECTOR WITH ZEROES |
|||
; |
|||
;------------------------------------------------------------------------------- |
|||
; SECTOR 3 |
|||
; |
|||
; OS AND DISK METADATA |
|||
; |
|||
;---------------------------------------------------------------------------- |
|||
; |
|||
.FILL (BLK_SIZE * 3),0 ; FIRST 384 BYTES ARE NOT YET DEFINED |
|||
; |
|||
; THE FOLLOWING TWO BYTES ARE AN ADDITIONAL SIGNATURE THAT IS VERIFIED BY |
|||
; SOME HARDWARE BIOSES. |
|||
; |
|||
PR_SIG .DB $5A,$A5 ; SIGNATURE GOES HERE |
|||
; |
|||
.FILL (META_LOC - $),0 |
|||
; |
|||
; METADATA |
|||
; |
|||
PR_WP .DB 0 ; (1) WRITE PROTECT BOOLEAN |
|||
PR_UPDSEQ .DW 0 ; (2) PREFIX UPDATE SEQUENCE NUMBER (DEPRECATED?) |
|||
PR_VER .DB RMJ,RMN,RUP,RTP ; (4) OS BUILD VERSION |
|||
PR_LABEL .DB "Unlabeled$$$$$$$","$" ; (17) DISK LABEL (EXACTLY 16 BYTES!!!) |
|||
.DW 0 ; (2) DEPRECATED |
|||
PR_LDLOC .DW SYS_LOC ; (2) ADDRESS TO START LOADING SYSTEM |
|||
PR_LDEND .DW SYS_END ; (2) ADDRESS TO STOP LOADING SYSTEM |
|||
PR_ENTRY .DW SYS_ENT ; (2) ADDRESS TO ENTER SYSTEM (OS) |
|||
; |
|||
#IF (META_SIZE != ($ - META_LOC)) |
|||
.ECHO "META_SIZE VALUE IS WRONG!!!\r\n" |
|||
!!! |
|||
#ENDIF |
|||
; |
|||
#IF ($ != PREFIX_SIZE) |
|||
.ECHO "LOADER PREFIX IS WRONG SIZE!!!\r\n" |
|||
!!! |
|||
#ENDIF |
|||
; |
|||
;------------------------------------------------------------------------------- |
|||
; SECTOR 4+ |
|||
; |
|||
; PSYSTEM LOADER |
|||
; - LOAD SBIOS TO HIGH MEMORY (JUST BELOW HBIOS PROXY) |
|||
; - LOAD PSYSTEM BOOTSTRAP & JUMP TO IT |
|||
; |
|||
;---------------------------------------------------------------------------- |
|||
; |
|||
#include "../HBIOS/hbios.inc" |
|||
; |
|||
; |
|||
bel .equ 7 ; ASCII bell |
|||
bs .equ 8 ; ASCII backspace |
|||
lf .equ 10 ; ASCII linefeed |
|||
cr .equ 13 ; ASCII carriage return |
|||
; |
|||
interp_base .equ $0100 ; first loc used by the interpreter |
|||
low_memory .equ $0100 ; lowest available ram location |
|||
interleave .equ 1 ; interleaving factor (n:1) |
|||
first_track .equ 1 ; first interleaved track |
|||
skew .equ 0 ; track-to-track skew |
|||
; |
|||
; |
|||
; |
|||
.org loader_loc |
|||
; |
|||
ld sp,stack ; setup private stack |
|||
; |
|||
call nl2 ; formatting |
|||
ld hl,str_banner ; display boot banner |
|||
call pstr ; do it |
|||
; |
|||
; Copy BIOS to running location |
|||
; |
|||
ld hl,loader_end ; BIOS image is at end of loader |
|||
ld de,bios_loc ; BIOS execution location |
|||
ld bc,bios_size ; Size of BIOS |
|||
ldir ; do it |
|||
; |
|||
; Copy p-System bootstrap to running location |
|||
; |
|||
ld hl,loader_end + bios_size ; bootstrap appended after BIOS |
|||
ld de,boot_loc ; bootstrap runs here |
|||
ld bc,boot_size ; size of bootstrap code |
|||
ldir ; do it |
|||
; |
|||
; Print some interesting info |
|||
; |
|||
call nl2 ; spacing |
|||
ld hl,str_info ; info string |
|||
call pstr ; print it |
|||
ld bc,bios_loc ; bios location adr |
|||
call prthexword ; print it |
|||
ld hl,str_info2 ; additional info string |
|||
call pstr ; print it |
|||
ld bc,boot_loc ; bootstrap location adr |
|||
call prthexword ; print it |
|||
call nl2 ; spacing |
|||
; |
|||
; Push key values onto the stack |
|||
; |
|||
ld hl,seclen ; maximum number of bytes per sector |
|||
push hl |
|||
ld hl,sectors ; maximum number of sectors in table |
|||
push hl |
|||
ld hl,skew ; track-to-track skew |
|||
push hl |
|||
ld hl,first_track ; first interleaved track |
|||
push hl |
|||
ld hl,interleave ; interleaving factor |
|||
push hl |
|||
ld hl,seclen ; bytes per sector |
|||
push hl |
|||
ld hl,sectors ; sectors per track |
|||
push hl |
|||
ld hl,tracks ; tracks per disk |
|||
push hl |
|||
ld hl,bios_loc-2 ; top word of available ram - sbios address-2 |
|||
push hl |
|||
ld hl,low_memory ; bottom word of available ram |
|||
push hl |
|||
ld hl,bios_loc ; address of BIOS (start of jump table) |
|||
push hl |
|||
ld hl,interp_base ; starting address of the interpreter |
|||
push hl |
|||
#if testbios |
|||
;ld hl,disks-1 ; maximum (highest) disk drive number |
|||
;push hl |
|||
#endif |
|||
; |
|||
jp boot_loc ; jump to bootloader |
|||
; |
|||
ret |
|||
; |
|||
; |
|||
; Print string at HL on console, null terminated |
|||
; |
|||
pstr: |
|||
ld a,(hl) ; get next character |
|||
or a ; set flags |
|||
inc hl ; bump pointer regardless |
|||
ret z ; done if null |
|||
call cout ; display character |
|||
jr pstr ; loop till done |
|||
; |
|||
; Print volume label string at HL, '$' terminated, 16 chars max |
|||
; |
|||
pvol: |
|||
ld b,16 ; init max char downcounter |
|||
pvol1: |
|||
ld a,(hl) ; get next character |
|||
cp '$' ; set flags |
|||
inc hl ; bump pointer regardless |
|||
ret z ; done if null |
|||
call cout ; display character |
|||
djnz pvol1 ; loop till done |
|||
ret ; hit max of 16 chars |
|||
; |
|||
; Start a newline on console (cr/lf) |
|||
; |
|||
nl2: |
|||
call nl ; double newline |
|||
nl: |
|||
ld a,cr ; cr |
|||
call cout ; send it |
|||
ld a,lf ; lf |
|||
jp cout ; send it and return |
|||
; |
|||
; Print a dot on console |
|||
; |
|||
pdot: |
|||
push af |
|||
ld a,'.' |
|||
call cout |
|||
pop af |
|||
ret |
|||
; |
|||
; Print the hex byte value in A |
|||
; |
|||
prthexbyte: |
|||
push af |
|||
push de |
|||
call hexascii |
|||
ld a,d |
|||
call cout |
|||
ld a,e |
|||
call cout |
|||
pop de |
|||
pop af |
|||
ret |
|||
; |
|||
; Print the hex word value in BC |
|||
; |
|||
prthexword: |
|||
push af |
|||
ld a,b |
|||
call prthexbyte |
|||
ld a,c |
|||
call prthexbyte |
|||
pop af |
|||
ret |
|||
; |
|||
; Convert binary value in A to ASCII hex characters in DE |
|||
; |
|||
hexascii: |
|||
ld d,a |
|||
call hexconv |
|||
ld e,a |
|||
ld a,d |
|||
rlca |
|||
rlca |
|||
rlca |
|||
rlca |
|||
call hexconv |
|||
ld d,a |
|||
ret |
|||
; |
|||
; Convert low nibble of A to ASCII hex |
|||
; |
|||
hexconv: |
|||
and 0Fh ; low nibble only |
|||
add a,90h |
|||
daa |
|||
adc a,40h |
|||
daa |
|||
ret |
|||
; |
|||
; Output character from A |
|||
; |
|||
cout: |
|||
; Save all incoming registers |
|||
push af |
|||
push bc |
|||
push de |
|||
push hl |
|||
; |
|||
; Output character to console via HBIOS |
|||
ld e,a ; output char to E |
|||
ld c,CIO_CONSOLE ; console unit to C |
|||
ld b,BF_CIOOUT ; HBIOS func: output char |
|||
rst 08 ; HBIOS outputs character |
|||
; |
|||
; Restore all registers |
|||
pop hl |
|||
pop de |
|||
pop bc |
|||
pop af |
|||
ret |
|||
; |
|||
; Input character to A |
|||
; |
|||
cin: |
|||
; Save incoming registers (AF is output) |
|||
push bc |
|||
push de |
|||
push hl |
|||
; |
|||
; Input character from console via hbios |
|||
ld c,CIO_CONSOLE ; console unit to c |
|||
ld b,BF_CIOIN ; HBIOS func: input char |
|||
rst 08 ; HBIOS reads character |
|||
ld a,e ; move character to A for return |
|||
; |
|||
; Restore registers (AF is output) |
|||
pop hl |
|||
pop de |
|||
pop bc |
|||
ret |
|||
; |
|||
; Return input status in A (0 = no char, != 0 char waiting) |
|||
; |
|||
cst: |
|||
; Save incoming registers (AF is output) |
|||
push bc |
|||
push de |
|||
push hl |
|||
; |
|||
; Get console input status via HBIOS |
|||
ld c,CIO_CONSOLE ; console unit to C |
|||
ld b,BF_CIOIST ; HBIOS func: input status |
|||
rst 08 ; HBIOS returns status in A |
|||
; |
|||
; Restore registers (AF is output) |
|||
pop hl |
|||
pop de |
|||
pop bc |
|||
ret |
|||
; |
|||
str_banner .db "RomWBW HBIOS p-System Loader v" |
|||
.db BIOSVER |
|||
.db 0 |
|||
str_info .db "Loading pSystem BIOS @ 0x",0 |
|||
str_info2 .db ", Bootstrap @ 0x",0 |
|||
; |
|||
.fill 32,0 |
|||
stack .equ $ |
|||
; |
|||
.fill loader_end - $ |
|||
; |
|||
.end |
|||
@ -0,0 +1,32 @@ |
|||
testbios .equ 0 |
|||
; |
|||
; p-System Loader |
|||
; |
|||
loader_size .equ $200 |
|||
loader_loc .equ $100 |
|||
loader_end .equ loader_loc + loader_size |
|||
; |
|||
; p-System BIOS |
|||
; |
|||
bios_size .equ $200 |
|||
bios_loc .equ $FE00 - bios_size |
|||
bios_end .equ bios_loc + bios_size |
|||
; |
|||
; p-System Bootstrap |
|||
; |
|||
#if testbios |
|||
boot_size .equ $300 |
|||
boot_loc .equ $8000 |
|||
boot_end .equ boot_loc + boot_size |
|||
#else |
|||
boot_size .equ $800 |
|||
boot_loc .equ $8200 |
|||
boot_end .equ boot_loc + boot_size |
|||
#endif |
|||
; |
|||
; Disk geometry |
|||
; |
|||
seclen .equ 512 ; bytes per sector |
|||
sectors .equ 16 ; sectors per track |
|||
tracks .equ 192 ; tracks per disk |
|||
disks .equ 6 ; number of pSystem disk devices |
|||
Binary file not shown.
Loading…
Reference in new issue