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Type: Posts; User: resman

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  1. Replies
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    Can't help you with SCSI cables, but could I ask...

    Can't help you with SCSI cables, but could I ask which SystemPro you have? I wrote the firmware for the original IDA. Still have my prototype IDA but SystemPros, especially the original, are as rare...
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    I had this exact same problem hooking up a...

    I had this exact same problem hooking up a monochrome Amdek to my CGA Deskpro. I ended up writing my own TSR to fix this issue:...
  3. Thread: Adding NOPs

    by resman
    Replies
    53
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    2,697

    It's going to be a little difficult to debug...

    It's going to be a little difficult to debug without any real insight into the operation of the CPU, but a few things to try:

    Did you initialize the reset vector to $0000?

    When it comes out of...
  4. This looks similar to the Orchid Tiny Turbo 286 I...

    This looks similar to the Orchid Tiny Turbo 286 I have in my Compaq Portable. It provides a nice boost of performance for all the programs I've run on it (mostly development tools).
  5. Thread: Adding NOPs

    by resman
    Replies
    53
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    2,697

    Without further qualifying the addresses of the...

    Without further qualifying the addresses of the flip flop's set & reset, any IRQ, NMI, or RST is going to drive both set & reset when the 6502 tries to fetch the vector from page $FF, setting A15..A8...
  6. Thread: Adding NOPs

    by resman
    Replies
    53
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    2,697

    So the OSI 300 is pretty much the barest bones...

    So the OSI 300 is pretty much the barest bones 6502 possible (with 1 bit I/O). It doesn't even have a ROM - you have to preload the reset vector into locations $7C and $7D (reflecting $FFFC and...
  7. Thread: Adding NOPs

    by resman
    Replies
    53
    Views
    2,697

    It only hooks up address line A0..A6, so the same...

    It only hooks up address line A0..A6, so the same 128 bytes are replicated through the memory map. As long as the stack pointer is initialized to $7F (or actually $FF would work, too), it will look...
  8. Thread: Adding NOPs

    by resman
    Replies
    53
    Views
    2,697

    So they conveniently attached the flip flop to...

    So they conveniently attached the flip flop to page 1 (where the 6502 stack lives)? Better take that into consideration any time you use a subroutine call to play with the flip flop!
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    Speaking of neat bit twiddling, Jim Blinn wrote a...

    Speaking of neat bit twiddling, Jim Blinn wrote a very informative article describing tricks you can do with the IEEE FP format. Look at page 132 here:...
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    Which one? The one with MMX, MMX2 , SSE, SSE2?...

    Which one? The one with MMX, MMX2 , SSE, SSE2? Maybe I'm just a little irked that I can't run modern browsers (Chrome/Mozilla) on my non-SSE2 machine ;-)
  11. Hi sudo459- reenigne certainly has a lot of...

    Hi sudo459-

    reenigne certainly has a lot of experience with coding for both, but I'd add that although the CGA may have a simpler programming model, it doesn't come without challenges. Color is a...
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    Great! Pictures...

    Great! Pictures...
  13. Thread: Slow News Day

    by resman
    Replies
    103
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    6,230

    For me, the issue is related to the shorthand...

    For me, the issue is related to the shorthand multiplication operator used. Most of us are used to seeing an algebraic equation like:

    ax + by + c

    where the inner terms are multiple together...
  14. Replies
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    3,577

    Here are the results for a Compaq Deskpro at...

    Here are the results for a Compaq Deskpro at ~7.14 MHz with a NEC V30:

    100: 0.22
    1000: 12.08
    3000: 102.53
  15. Replies
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    Try pressing Ctrl Alt > to switch to external...

    Try pressing Ctrl Alt > to switch to external monitor: https://en.wikipedia.org/wiki/Compaq_Portable
  16. The first day of work at Compaq ( 1988 ) I...

    The first day of work at Compaq ( 1988 ) I received my development computer and accessories in boxes and the requisite torx toolkit to assemble it all. You were expected to be able to put everything...
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    It's reporting a video failure. Not many options...

    It's reporting a video failure. Not many options to try, but:

    Double check the motherboard DIP switch setting to make sure it matches CGA and Compaq internal monitor.

    Try a different...
  18. Replies
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    The memory boards aren't anything like the...

    The memory boards aren't anything like the Portable 386's - if you're a little patient they will show up on eBay (even though the OP doesn't want to look there).

    The 386/20e was still ISA - the...
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    With the unicorn CRT. Well done! The 386/20e is...

    With the unicorn CRT. Well done! The 386/20e is my favorite Compaq (well, right after the original SystemPro). The perfect combination of size and power and I really like the feel of the keyboard....
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    I think there is, but with a NEC V20 upgrade you...

    I think there is, but with a NEC V20 upgrade you can use the Iomega ZIP software.
  21. Replies
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    MASM 5.1 works well on 8088/86. I like it because...

    MASM 5.1 works well on 8088/86. I like it because it supports the older feels-like-programming-a-mainframe syntax as well as the simplified model syntax.

    Also, as the OP is coming from higher...
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    The first thing I'd do is put a simple RC circuit...

    The first thing I'd do is put a simple RC circuit in front of that tach module to "debounce" the signal. I think without cleaning up the ringing, your just going to frustrate yourself.
  23. Replies
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    One possible option is to pass the command in on...

    One possible option is to pass the command in on the dosbox command line via '-c'. For instance:



    dosbox -c "dir /w" -c exit


    No need to change any configuration files except to maybe mount...
  24. Replies
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    So I dragged out my 64 bit linux laptop and...

    So I dragged out my 64 bit linux laptop and installed DOSEMU. No dice running WATCOM tools. I then decided to try running under Wine and it came back with "unable to allocate DOS memory. Install...
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    Did you try: echo 1 > /proc/sys/abi/ldt16 ...

    Did you try:


    echo 1 > /proc/sys/abi/ldt16

    That tip should probably be part of the dosemu documentation.


    from the bug report?
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