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Type: Posts; User: JohnElliott

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  1. Replies
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    VGA cards tend to have a 32k BIOS ROM, and this...

    VGA cards tend to have a 32k BIOS ROM, and this would conflict with the PGC transfer buffer at C600:0000. If you can find a VGA card with a 16k BIOS ROM it should work. You'd also need to disable CGA...
  2. I spotted one problem with my patch after...

    I spotted one problem with my patch after posting: mode 6 VRAM is at segment B800 but mode 11h VRAM is at segment A000. Unfortunately it's not useful to do a binary search for 00 B8 in all of VisiOn,...
  3. VISIONAT.EXE seems to be responsible for setting...

    VISIONAT.EXE seems to be responsible for setting the mode - I loaded it under DEBUG, put a breakpoint at the INT 10h handler, and a couple of levels up the stack found some code that looks as if it's...
  4. I've had a quick look; the format written by DCF...

    I've had a quick look; the format written by DCF 5.1 is a raw disc image with an extra 512 bytes at the end containing geometry information.


    00168000 00 A0 05 F6 F6 F6 F6 F6 F6 F6 F6 00 02...
  5. If they're using Windows 10 they can load the...

    If they're using Windows 10 they can load the Windows Subsystem for Linux and run the daemon within it :-)
  6. IMD access could probably be done by using LibDsk...

    IMD access could probably be done by using LibDsk as a block layer on the server end, but I expect a lot of copy-protected software uses direct hardware access to do non-standard things with the FDC...
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    My own JOYCE (http://www.seasip.info/Unix/Joyce/)...

    My own JOYCE emulates a specific CP/M computer (the Amstrad PCW) and has utilities to export and import files to/from the host environment.
  8. Not that it helps with a CP/M 2.2 use case, but...

    Not that it helps with a CP/M 2.2 use case, but CP/M 3 and CP/M-86 have this covered with DRV_FLUSH (BDOS function 30h).

    In your case, if you perform another directory operation after closing the...
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    I'll try to be patient, then, and keep trying to...

    I'll try to be patient, then, and keep trying to disassemble the firmware ROM of the one I've got.

    I'd noticed the John Grant talk - not sure how straightforward it would be for me to get there...
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    Nine Tiles Multilink network

    I only became aware of this networking system recently, when I saw an adapter for it on eBay. Google turned up a few more leads, and I was able to create a web page gathering together just about...
  11. I've got a physical PG-640 manual. On DIP...

    I've got a physical PG-640 manual. On DIP switches, it says:
  12. The QG-640 manual is on Bitsavers:...

    The QG-640 manual is on Bitsavers: http://www.bitsavers.org/pdf/matrox/ . I think all the bits about commands and their syntax will apply to the PG-640.
  13. Thread: Pcw9512

    by JohnElliott
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    1,012

    Back in the day, 3.5" expansion kits for PCWs...

    Back in the day, 3.5" expansion kits for PCWs came with a file to widen the hole in the case, and a self-adhesive bezel to cover the open gap. This worked better on the 9512 (where the drive was...
  14. Yes - there are five iterations of the Portable...

    Yes - there are five iterations of the Portable CGA card, and all but the first will also fit in a Deskpro. They have jumpers on them to control whether the 9-pin video socket is enabled in...
  15. You never know. One 80s computer I bought on eBay...

    You never know. One 80s computer I bought on eBay had obviously been used to run a hotel. I only investigated briefly before wiping the drive, but it could have contained customers' or employees'...
  16. What to do with apparently dead hard drives

    As I'm going through my collection winnowing out those items that I don't know to be useful or believe to be beautiful, I've come upon a couple of vintage hard drives that don't spin up (a TM-262...
  17. You'd probably need to tweak the BIOS so the...

    You'd probably need to tweak the BIOS so the keyboard controller looks for an XT keyboard rather than an AT one.
  18. Here's the Deluxe Option Board document in...

    Here's the Deluxe Option Board document in question: ftp://ftp.mindcandydvd.com/pub/OptionBoard/(1989)%20Deluxe%20Option%20Board%20v5.4/Package%20Contents/Documentation/OB_Drive_Note.pdf
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    I've tried it with an ATI EGA Wonder in a system...

    I've tried it with an ATI EGA Wonder in a system with motherboard CGA. It does work but you can only use the EGA for text mode 7 (mono text) and 0Fh (640x350 mono graphics).
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    Or if you've got a DS-DOS boot floppy, you can...

    Or if you've got a DS-DOS boot floppy, you can run VIDEO.COM to switch from native to CGA video.
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    The Paradise EGA chipset has hardware emulation...

    The Paradise EGA chipset has hardware emulation of CGA (and Plantronics, and Hercules) cards, selected using the PEGA utility.
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    Also the PC1640 and PC1512 have different video...

    Also the PC1640 and PC1512 have different video hardware, so GEM is configured with different video drivers on each disk set.
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    And because it's been open-sourced I've been able...

    And because it's been open-sourced I've been able to write drivers for video cards / modes that weren't supported at the time (such as VESA 1024x768 mode). Windows 1.x / 2.x drivers are a much...
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    I don't know if this will work with OS/2 but I've...

    I don't know if this will work with OS/2 but I've done a similar process with other operating systems:
    * Create a FAT16-formatted VHD
    * Add it to the OS/2 virtual machine
    * Copy the files onto...
  25. Would a dump of the keyboard microcontroller ROM...

    Would a dump of the keyboard microcontroller ROM be any use to you?

    (When setting LEDs on an IBM keyboard, the first byte of the command is 0EDh. I think I recognise that as 11101101 in your...
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