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@ -16,12 +16,12 @@ fill.asm used to complete the track 0 build (see below) |
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Notes: |
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Notes: |
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This adatation runs on a single RomWBWW HBIOS hard disk type device (CF |
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Cart, SD Card, IDE drive, etc.). The image built (psys.img) should be |
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copied to your disk media start at the first sector. You can then boot |
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by selecting the corresponding disk device unit number from the RomWBW |
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boot loader prompt. The p-System disk image (psys.img) is entirely |
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different from the RomWBW CP/M-style disk images. |
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This adaptation runs on a single RomWBW HBIOS hard disk type device (CF |
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Card, SD Card, IDE drive, etc.). The image built (psys.img) should be |
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copied to your disk media starting at the first sector. You can then |
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boot by selecting the corresponding disk device unit number from the |
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RomWBW 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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The boot device hard disk is broken up into 6 logical p-System |
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The boot device hard disk is broken up into 6 logical p-System |
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volumes. These are referred to as p-System slices. A single RomWBW |
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volumes. These are referred to as p-System slices. A single RomWBW |
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@ -91,4 +91,51 @@ There is currently no support for floppy drives. |
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Wayne Warthen |
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Wayne Warthen |
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wwarthen@gmail.com |
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wwarthen@gmail.com |
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5:42 PM Sunday, January 15, 2023 |
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5:42 PM Sunday, January 15, 2023 |
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So, it turns out that the serial line support in p-System is seriously |
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deficient. It insists on polling all of the serial input devices |
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(console, remote, and printer) when the sytem is idle with the idea |
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that it will queue up any characters received. I guess the idea is |
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that this will help in scenarios where characters are coming in too |
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fast to be processed. However, the basic/default interpreter does not |
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support the queues! Strangely, it still polls the the devices and |
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literally discards anything received. This completely undermines the |
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ability of the underlying hardware which is doing it's own robust |
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interrupt or hardware based buffering and flow control. |
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I have relinked the interpreter (SYSTEM.INTERP) so that it now uses |
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the BIOS version that supports the queues (BIOS.CRP). This mostly |
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resolves the situation, but needlessly increases the size of the |
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interpreter. Additionally, I believe that if the p-System queue gets |
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full, it will still poll and discard any new characters received. I |
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have not seen any documentation indicating the size of the queues. |
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Seriously, what were they thinking. |
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One last thing in case anyone actually reads this. As indicated |
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above, this is an adaptation of p-System IV.0. It is well documented |
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that SofTech produced a IV.1 with some nice enhancements (like |
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subsidiary volumes and decent support for ANSI/VT-100 terminals). I |
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have been unable to track down the IV.1 distribution media despite |
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trying very hard. If anyone knows of a source for the media of the |
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Adapable p-System for Z80, I would love to get hold of it. |
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3:58 PM Tuesday, January 17, 2023 |
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I forgot to discuss the terminal handling. |
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The p-System has a setup program (SETUP.CODE) that is used to define |
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terminal handling escape sequences. However, it is limited to a |
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single character to introduce the escape sequences. Since ANSI |
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and VT-100 escape sequences start with 2 characters, this is |
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problematic. The BIOS for RomWBW borrows a hack used by Udo Monk. |
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Specifically, whenever an outbound <esc> is seen, a '[' is added |
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in flight. |
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Likewise, it is problematic to define a way to interpret the |
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arrow keys transmitted by an ANSI/VT-100 terminal. In this case, |
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the setup program was used to define up/down/left/right like |
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WordStar does: ^E,^X,^S,^D. |
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5:48 PM Tuesday, January 17, 2023 |
b1ackmai1er
3 years ago
GitHub