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186 lines
9.2 KiB
186 lines
9.2 KiB
BPBIOS for RomWBW / HBIOS
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-------------------------
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The build process included in this directory constructs multiple BPBIOS OS images that
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can be loaded dynamically on a running RomWBW CP/M-like system. Normally, you would
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boot CP/M and then load the desired variant. On a running system, you would enter
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something like "LDSYS BP34". This document describes the specifics of the build
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process and the image variations which are identified by naming convention.
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Each image is composed of three basic components: Command Processor (CCP), Disk
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Operating System (DOS), and Basic I/O System (BIOS). The CCP and DOS components
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are pre-built, relocatable binaries. The BIOS (BPBIOS) is assembled into a relocatable
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binary by the build, then the build links together all three components to form the
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final loadable image (.IMG) file. The linking process is performed by the custom BPBIOS
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linker (BPBUILD.COM). In addition to linking the 3 components, BPBUILD also
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adjusts the ZCPR environment configuration.
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BPBUILD is designed to be run interactively. However, it can be started with an
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existing OS image to edit an existing image file. In order to achieve an automated
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build process with no interaction, this directory contains several template image (.DAT)
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files that have environment configurations defined below. The build process passes the desired
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tempate file to BPBUILD on the command line and uses input redirection to automate the
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running of BPBUILD.
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The CCP can be ZCPR 3.3 (ZCPR33?.REL), ZCPR 3.4 (Z34.REL), or ZCPR 4.1 (Z41.ZRL). ZCPR 3.3
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uses static references to the ZCPR segments, so a custom version of it must be assembled.
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The ZCPR33 subdirectory provides a build process for doing this. It produces a custom
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version of ZCPR33.REL with the correct static references to the ZCPR segments.
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The DOS can be ZSDOS 1.1 (ZSDOS.ZRL) or ZSDOS 2.03 (ZS203.ZRL). These are both pre-built
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relocatable binaries. Note that only certain version combinations of ZSDOS and ZCPR are
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possible as indicated below. Additionally, ZSDOS 2.X requires a banked BIOS.
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ZCPR 3.X == ZSDOS 1.X
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ZCPR 4.X == ZSDOS 2.X
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BPBIOS must be assembled for the target configuration. BPBIOS includes a DEF-WW-???????.LIB
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file during assembly which sets various equates to contol the features and behavior of
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BPBIOS. The relevant settings are:
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BANKED: If YES, BPBIOS implements memory banking features
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ZSDOS2: If YES, BPBIOS is built to utilize ZSDOS 2.X specifics features
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The table below illustrates the target build configurations along with the
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.DAT and .LIB files which are utilized for the specific configuration. The "?"
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is replaced with a letter that represents one of the ZCPR memory segment configurations
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described later in this document.
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BP33.DAT DEF-WW-Z33.LIB Non-Banked BPBIOS w/ ZCPR 3.3 & ZSDOS 1.1
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BP33BNK.DAT DEF-WW-Z33BNK.LIB Banked BPBIOS w/ ZCPR 3.3 & ZSDOS 1.1
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BP34.DAT DEF-WW-Z34.LIB Non-Banked BPBIOS w/ ZCPR 3.4 & ZSDOS 1.1
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BP34BNK.DAT DEF-WW-Z34BNK.LIB Banked BPBIOS w/ ZCPR 3.4 & ZSDOS 1.1
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BP41BNK.DAT DEF-WW-Z41BNK.LIB Banked BPBIOS w/ ZCPR 4.1 & ZSDOS 2.X
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The table below illustrates the BPBIOS equates used and the specific CCP/DOS/BIOS
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components that are used to generate each configuration. As above, the "?" is
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replaced with a letter that represents one of the ZCPR memory segment configurations
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described later in this document.
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BP33 BP33BNK BP34 BP34BNK BP41BNK
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-------------- -------------- -------------- -------------- -------------- --------------
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BANKED NO YES NO YES YES
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ZSDOS2 NO NO NO NO YES
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-------------- -------------- -------------- -------------- -------------- --------------
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CCP ZCPR33.REL ZCPR33.REL Z34.REL Z34.REL Z41.ZRL
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DOS ZSDOS.ZRL ZSDOS.ZRL ZSDOS.ZRL ZSDOS.ZRL ZS227G.ZRL
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BIOS BP33.REL BP33BNK.REL BP34.REL BP34BNK.REL BP41BNK.REL
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-------------- -------------- -------------- -------------- -------------- --------------
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In addition to the configuration options above, ZCPR also utilizes a
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defined set of memory segments in upper memory. The location and
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size of these segments have many ramifications and general ZCPR /
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BPBIOS documents should be consulted to understand these. The build
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process used here produces a custom configuration appropriate for
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RomWBW. The original distributed memory segment configuration occupies
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the top of memory which, unfortunately, conflicts with the RomWBW
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HBIOS need to occupy this space.
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Although RomWBW HBIOS is implemented in it's own dedicated memory
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bank, it requires a small proxy at the top of memory which acts as a
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mechansim to route calls to HBIOS. The proxy occupies FE00H-FFFFH and
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implements all of the HBIOS routing code.
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Taking the above into account, the build process implements a memory
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segment configuration that is compatible with RomWBW HBIOS.
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Essentially, this configuration rearranges the ZCPR memory segments to
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free up the area required by the HBIOS proxy. Note that this is a bit
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complicated because there are some constraints on the locations of
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certain segments.
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BPBIOS is assembled as relocatable code. Subsequently, the BPBUILD tool
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is used to link BPBIOS with the CCP and DOS relocatable code to produce
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the loadable image (.IMG file). Note that BPBUILD does more than just
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linking. As part of it's work, BPBUILD adjusts the built-in environment
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segment to customize the final image for the desired location and size
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of Z-System segments.
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The following table summarizes the original memory segment configuration and the
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new configuration utilized by this build process. As indicated above, the
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original configuration is incompatible with RomWBW HBIOS because it occupies the
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very top of memory. The original configuration is shown below purely to
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document the original distributed configuration.
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SEGMENT Original RomWBW Config
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-------------- -------------- --------------
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Environment FE00 FC00
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# Recs 2 2
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Flow Ctl Pkg FA00 F700
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# Recs 4 4
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I/O Pkg EC00 EF00
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# Recs 12 0
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Res Cmd Pkg F200 EF00
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# Recs 16 16
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Cmd Line FF00 FD00
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# Bytes 203 251
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Named Dirs FC00 F900
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# Ents 14 25
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Ext Path FDF4 FBF4
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# Ents 5 5
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Shell Stack FD00 FB00
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# Ents 4 4
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Ent Size 32 32
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Msg Buffer FD80 FB80
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Ext FCB FDD0 FBD0
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Ext Stack FFD0 FAD0
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User Space E900 EC00
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Size 300 300
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Wheel Byte FDFF FBFF
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The sections below provide a more detailed description of the memory
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segment configurations.
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=============================================================================
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ORIGINAL DISTRIBUTION CONFIGURATION (NO HBIOS):
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This is the original distribution configuration of BPBIOS which
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occupies all upper RAM (to FFFFH). So, there is no room for the
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HBIOS proxy and, therefore, is not compatibile with RomWBW. This
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configuration is documented only for reference. It is not built
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by the build process and is not compatible with RomWBW HBIOS.
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-----------------------------------------------------------------------------
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A - Environment - FE00H F - Named Dirs - FC00H
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Size (# recs)- 2 # of Entries - 14
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B - Flow Ctrl Pkg - FA00H G - External Path - FDF4H
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Size (# recs)- 4 # of Entries - 5
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C - I/O Package - EC00H H - Shell Stack - FD00H
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Size (# recs)- 12 # of Entries - 4
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D - Res Cmd Proc - F200H Entry Size - 32
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Size (# recs)- 16 I - Msg Buffer - FD80H
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E - Command Line - FF00H J - Ext. FCB - FDD0H
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Size (bytes) - 203 K - Ext. Stack - FFD0H
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=============================================================================
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=============================================================================
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ROMWBW CONFIGURATION (HBIOS PROXY @ FE00-FFFF):
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-----------------------------------------------------------------------------
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A - Environment - FC00H F - Named Dirs - F900H
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Size (# recs)- 2 # of Entries - 25
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B - Flow Ctrl Pkg - F700H G - External Path - FBF4H
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Size (# recs)- 4 # of Entries - 5
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C - I/O Package - EF00H H - Shell Stack - FB00H
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Size (# recs)- 0 # of Entries - 4
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D - Res Cmd Proc - EF00H Entry Size - 32
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Size (# recs)- 16 I - Msg Buffer - FB80H
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E - Command Line - FD00H J - Ext. FCB - FBD0H
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Size (bytes) - 251 K - Ext. Stack - FAD0H
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=============================================================================
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BPBIOS is designed to invoke a command at startup (autostart command). There
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are 3 ZEX command files customized for this build. They are ZSTT.ZEX, ZSTN.ZEX,
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and ZSTF.ZEX. BPBIOS is customized to launch the ZEX command file corresponding
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to the version of ZCPR being linked with it.
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The table below summarizes the loadable image files created by the build
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process:
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ZCPR ZSDOS BPBIOS STARTUP HBIOS PROXY IMAGE
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------ ------ -------------- -------------- -------------- --------------
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v3.3 v1.1 NON-BANKED ZST.ZEX EXTERNAL BP33.IMG
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v3.3 v1.1 BANKED ZST.ZEX EXTERNAL BP33BNK.IMG
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v3.4 v1.1 NON-BANKED ZST.ZEX EXTERNAL BP34.IMG
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v3.4 v1.1 BANKED ZST.ZEX EXTERNAL BP34BNK.IMG
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v4.1 v2.03 BANKED ZSTF.ZEX EXTERNAL BP41BNK.IMG
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--WBW 1:34 PM 10/7/2021
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