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  1. Ruud

    8087 Applications and Programming for the IBM PC and Other PCs

    I found the PDF of this book on internet, very interesting. It does mentioned it is accompanied with a disk. I searched internet but nothing found. Does anybody have (the contents of) this disk and is willing to share it with us? Thank you very much!
  2. Ruud

    Edit/Debug Pacioli 2000 for Y2K Compatibility

    In the first place, you need a bit more professional tool than DEBUG and I would suggest Borland Turbo Debugger. But I must warn you: if the program is more than a few KB, it will be a hell of a job. Debugging undocumented C or Pascal code can be very difficult but debugging undocumented ML code...
  3. Ruud

    Need some help from 6809 programmers at byte level

    Me, having a chicken head as avatar, why didn't I think of that? Thank you!
  4. Ruud

    Need some help from 6809 programmers at byte level

    First: thank you for answering all of my questions! That's the same in the datasheet I have. But for the post bytes [,R+] and [,-R] it states these are "not allowed". That blank confused me and that's why I asked. I think, for the moment, the only thing I can do is to dig up an emulator...
  5. Ruud

    Switching between two 8088 CPUs

    The basic idea: a toggle switch either enables the 8088 or the V20. Use the change in signal to trigger a circuit that resets the PC. Or use a DPDT toggle switch and use the second switch to trigger the reset in one or another way.
  6. Ruud

    Need some help from 6809 programmers at byte level

    A new question: ADCA [$1234] will end up as A9 9F 12 34 ADCA $1234 will end up as B9 12 34 I'm also creating a disassembler. The datasheet of the 6809 doesn't mention that an instruction, where bit 4 of the postbyte is zero ,is not allowed. That would mean that: A9 8F 12 34 can be...
  7. Ruud

    What are good examples of Windows Vista/7 era laptops that can run XP?

    Have you thought about using W7-32 bits? It still can run 16-bit programs and games just like XP but also has other advantages like being able to handle newer hardware.
  8. Ruud

    Switching between two 8088 CPUs

    Then what about using the RQ lines plus a small circuit that resets the system after turning the switch? No buffers needed IMHO. Only some gates to make sure that the switch tri-states the right CPU.
  9. Ruud

    MicroPython on IBM PC?

    I'm busy with creating my own OS with its own file system plus its own BASIC, all in assembly, meant to be run on a 8088. For cheer fun. So if someone wants to create Python for 8088, why not? Regarding the speed difference: it is an extra challenge to let Python run at a decent speed. The...
  10. Ruud

    Switching between two 8088 CPUs

    I'm at work and cannot get to schematics but one thing is sure: the Commodore SuperPET was a CBM 8032 with an extra board that contained a 6502 and a 6809. The 6502 was replaced with a socket + cable that was connected with this board. To get the 6809 running, the 6502 was simply powered off and...
  11. Ruud

    Help with custom autoexec messages?

    Could you give us some examples of the lines that go wrong, please?
  12. Ruud

    Need help identifying 386 board and RAM

    No, 1 MB + parity.
  13. Ruud

    XT-FDC project level of interest

    To be honest, I didn't read it all. But to I want to mention this: my XT uses a 16-bit FDC/IDE card. The FDC part is 8 bits and I use Sergey Kiselev's software to control it. And I connected an 8-bit CF card to the IDE port.
  14. Ruud

    What was the excitement of your first PC?

    My first computer was a Commodore 64. A class mate had started a company to assemble PCs (and it still exists) and I was his first worker. I got my own XT-clone with a whopping 640 KB of memory for loan. So much memory for those days, that I used a part of it as RAM disk: I was able to work much...
  15. Ruud

    Enta 486SX / Award V3.20-E Laptop won't work with any IDE drive....

    I worked with quite some old laptops and PCs and as long you had an HDD that was within range, things worked fine. EXCEPT if something deeper down broke! Specific case: two laptops with identical drives, one would start up with both HDDs, the other one couldn't even detect one.
  16. Ruud

    Need some help from 6809 programmers at byte level

    I had to think things over, quite hard, because this is a new situation for me. I do have a multi-pass assembler but it was meant to handle variables that contained variables declared after the original ones. But the mechanism can be used IMHO for this idea as well. The idea is to use long...
  17. Ruud

    Need some help from 6809 programmers at byte level

    That old assembler is indeed a two-pass assembler. OK, that explains everything, thank you very much!
  18. Ruud

    Need some help from 6809 programmers at byte level

    Already in 1985 I started writing my own 6502 assembler, written in Turbo Pascal. And I have been expanding it with other CPUs. I'm busy assembling this MicroKit09 and want to be able to write software for it using my own assembler. That will be an weird experience because the last time I wrote...
  19. Ruud

    Looking for ROM Images for a CBM 4040 drive and 6510 Kernal for a TED System

    The 6510 is slightly different in the use of its I/O pins and the original ROM cannot be used. The 4040 ROMS can be obtained here.
  20. Ruud

    Some questions about the Xi 8088….

    So speed cannot be the issue. When at home, I have to look what parts I use on my XI8088. FYI, I use a 16-bit FDC/IDE card with a CF card, 1.44 MB FDD and 1.2 MB FDD. As both the FDC and CF card only needs 8 bits, the extra 8 bits are unused.
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