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Type: Posts; User: JohnElliott

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  1. Replies
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    564

    I remember seeing a floppy disc formatter for the...

    I remember seeing a floppy disc formatter for the BBC micro that showed each track as a hollow bar; as each track was formatted, the bar was filled in and a musical note was played, ascending in...
  2. Thread: Pcw9512

    by JohnElliott
    Replies
    61
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    3,384

    This sounds like the Gotek issue mentioned...

    This sounds like the Gotek issue mentioned upthread. CP/M BIOSes since 1.9 stop the drive motor and wait for the drive to become not-ready. Fine on a normal PCW, but a Gotek doesn't emulate that...
  3. Thread: Pcw9512

    by JohnElliott
    Replies
    61
    Views
    3,384

    Worked fine when I wrote it :p

    Worked fine when I wrote it :p
  4. Thread: Pcw9512

    by JohnElliott
    Replies
    61
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    3,384

    The main differences are: * The built-in printer...

    The main differences are:
    * The built-in printer (8000-series and 9256 have a dot-matrix printer, 9512s have a daisywheel).
    * The monitor (8000-series have a green screen, 9000-series have a white...
  5. Thread: Pcw9512

    by JohnElliott
    Replies
    61
    Views
    3,384

    You can't boot a 9512 from an 8000-series disk...

    You can't boot a 9512 from an 8000-series disk image, or vice versa; the boot sector is different.
  6. mtools under linux can list the contents of an...

    mtools under linux can list the contents of an MSDOS filesystem:
    mdir -i filename

    It won't work with disk images that contain any sort of metadata, like TD0 or IMD.
  7. Replies
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    313

    I've got a paper copy of the PC2086 service...

    I've got a paper copy of the PC2086 service manual here. If I'm reading it correctly, the power supply chassis schematic diagram shows three connectors coming off it:

    CD601 has:
    Pin 1: +5V
    Pin...
  8. Thread: Pcw9512

    by JohnElliott
    Replies
    61
    Views
    3,384

    There are no jumpers but the drives do have a...

    There are no jumpers but the drives do have a link to select whether they are drive 0 or 1, so it may be possible to desolder and rewire the link. However the service manuals don't say how the link...
  9. Replies
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    898

    There are various ways to do bank-to-bank memory...

    There are various ways to do bank-to-bank memory transfers (XMOVE / MOVE), depending on the system hardware. On the Amstrad PCW, for example, which has a 16k memory paging granularity and can map any...
  10. Replies
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    898

    It's a tradeoff, particularly if you plan to...

    It's a tradeoff, particularly if you plan to bring up MP/M on the same hardware as well. In MP/M, each process has to go below the start of common memory so it wants to start at a relatively high...
  11. Replies
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    They're in Compaq QRST (Quick Release Sector...

    They're in Compaq QRST (Quick Release Sector Transfer) format. You'll need to write them to a floppy using Compaq's tool (qrst.exe) or LibDsk.
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    You need to check how the DIP switches...

    You need to check how the DIP switches are set - it may be configured for an external monitor rather than the internal display.
  13. VirtualBox has a command-line tool (vboxmanage)...

    VirtualBox has a command-line tool (vboxmanage) which can do this: vboxmanage convertfromraw raw_image vm_image
  14. Replies
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    429

    Apricot PCs like the Portable have their own...

    Apricot PCs like the Portable have their own non-standard boot sector, which Windows won't recognise. However Apricot MS-DOS, at least in some versions, can access disks in the standard PCDOS 713k...
  15. Replies
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    672

    For a 3.5" drive A:, the PC1512 needs a drive...

    For a 3.5" drive A:, the PC1512 needs a drive that can respond to DS0 rather than DS1, since unlike an IBM it doesn't use the cable twist to distinguish drives.
  16. Replies
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    1,779

    Yes, F0 is a key-up prefix in scancode Sets 2 and...

    Yes, F0 is a key-up prefix in scancode Sets 2 and 3.
  17. Replies
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    1,779

    That looks like the same controller board and MCU...

    That looks like the same controller board and MCU as my 1390876, so it probably sends the same scancodes.



    If you download KB from http://www.seasip.info/DOS/ it allows you to display the...
  18. Replies
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    672

    A Gotek with the stock 720k firmware...

    A Gotek with the stock 720k firmware (SFRM72-TU100K) should also work, though I haven't tried this on a PC1512.
  19. Replies
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    1,779

    Are you able to open it up and see if there's a...

    Are you able to open it up and see if there's a label on the keyboard microcontroller? The 3270PC keyboard MCU is part number 1385001; the AT keyboard MCU is part number 1503099.
  20. Replies
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    Not quite - they have a presence detect signal on...

    Not quite - they have a presence detect signal on pins 24/28.
  21. Poll: Apart from systems that have sentimental value...

    Apart from systems that have sentimental value for me, my interest tends to be in the software rather than the hardware it runs on. So I obtain (say) a graphics card to find out how it works,...
  22. Replies
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    I've dumped the ROMs, at least. The Motorola chip...

    I've dumped the ROMs, at least. The Motorola chip on the keyboard card is likely to be a microcontroller, but without the use of fuming nitric acid I'm not sure how you'd prove it.

    I'm not aware...
  23. LibDsk, as presently constituted, can't - it can...

    LibDsk, as presently constituted, can't - it can access / convert disc images where different tracks have different geometries, but the built-in tools can't create them from scratch. The nearest it...
  24. Replies
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    I've now scanned my four :YES manuals: ...

    I've now scanned my four :YES manuals:

    Getting Started
    User Guide
    DOS Plus User Guide
    MSDOS 3.1 User Guide

    If anyone would like a copy, let me know.
  25. Replies
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    The other consideration is copyright. GEM was...

    The other consideration is copyright. GEM was open-sourced, so I didn't feel any particular compunction about disassembling binary files and basing drivers on them (as long as the copyright message...
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