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Type: Posts; User: BillGee

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  1. Replies
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    I would look for hardware handshaking first. ...

    I would look for hardware handshaking first.

    My first computer was a SWTPC 6809 built from a kit. It refused to do anything. Everything pointed to a defective serial interface card. I was...
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    960

    There is "an app" for that. Circuit board...

    There is "an app" for that.

    Circuit board ejectors lever against the top of the card cage. They are very inexpensive, but shipping can be a killer. Maybe try to find something with free shipping...
  3. I am now able to cross assemble most inherent...

    I am now able to cross assemble most inherent 6800 instructions.

    While 6800 binary files currently have no value on a 6502, this means that a large part of the fundamental infrastructure of the...
  4. I have to partially retract that statement. ...

    I have to partially retract that statement. Somehow, I managed to forget that the 6800 only has one index register; the X register must to be ping ponged between I and J. Still, completely...
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    XLT86 from Digital Research is what I remember. ...

    XLT86 from Digital Research is what I remember. They were trying very hard to get programs running on CP/M-86.

    http://en.wikibedia.ru/wiki/XLAT86
  6. I have been known to say that programming a 6502...

    I have been known to say that programming a 6502 in assembly language is tedious compared with other processors. However, I just encountered an example in which the 6502 absolutely blows away the...
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    http://www.rcollins.org/ddj/Sep96/Sep96.html

    http://www.rcollins.org/ddj/Sep96/Sep96.html
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    Some but definitely not all. Other Z80...

    Some but definitely not all. Other Z80 instruction prefixes are DD, FD and CB. And some like the relative jumps reside in the main code page without a prefix.
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    For the .COM version, leave off MOV AX,...

    For the .COM version, leave off



    MOV AX, DSEG
    MOV DS, AX


    the system automatically loads DS with the code segment.
  10. A simple and elegant solution presented itself...

    A simple and elegant solution presented itself after I slept on it and came back to look at the problem from outside of the box: format each line of code, or not, in this case, as if the whole thing...
  11. I dove headlong into the assembler. Implementing...

    I dove headlong into the assembler. Implementing conditional assembly does not initially appear to be very easy.

    So to learn the code, I made a few changes to fix some things which have always...
  12. This is a bit of a one month progress report. ...

    This is a bit of a one month progress report.

    The FLEX file system (File Management System or FMS) is feature complete except for the portions dealing with the creation, reading and writing of...
  13. I can now view a catalog of files on a disk, type...

    I can now view a catalog of files on a disk, type out the contents of text files, delete and rename files.

    Overall, I am very pleased with the progress of this project; it was started on April 6,...
  14. At long last, I am finally able to load and run a...

    At long last, I am finally able to load and run a program from a binary file. A surprising amount of the file system had to be implemented in order to be able to do that. I am very thankful to be...
  15. I just tried running TLINK version 5.1 from the...

    I just tried running TLINK version 5.1 from the Borland C++ 3.1 installation. It failed trying to load DPMI support. That is something very far from my radar.

    alecv is right. These tools run...
  16. The reason I asked is that a long, long time ago...

    The reason I asked is that a long, long time ago in a place not at all far away, I set upon writing a 16-bit x86 emulator. The original objective was to be able to run Windows 3.x programs on a...
  17. What kind of DOS programs are you trying to run?

    What kind of DOS programs are you trying to run?
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    I believe the V20 supports the 80186 instruction...

    I believe the V20 supports the 80186 instruction set, not the 286.
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    I have worked with object file formats in the...

    I have worked with object file formats in the past. Mostly Intel and Microsoft OMF and a little with Borland's TPU.

    A smart linker needs to know the boundaries of the individual functions within...
  20. Thread: Isa card help

    by BillGee
    Replies
    7
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    419

    Look for drivers for the Western Digital chip...

    Look for drivers for the Western Digital chip set.

    I know in the past, there were only a handful of companies which made chip sets for video cards. The drivers did not usually care who actually...
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    Do you know the format of the .DSK file? Is it...

    Do you know the format of the .DSK file? Is it just a raw sector dump by any chance?

    I have played with the .IMD file format and can convert it to a raw image.
  22. The CP/M trick moves code in 256 byte increments,...

    The CP/M trick moves code in 256 byte increments, so only the upper bytes of addresses need to be patched.
  23. I have encountered the linked list idea in some...

    I have encountered the linked list idea in some object code file formats. The problem is that the links leave no room for the original contents of the item to be adjusted, so to what do I add the...
  24. For greatest portability, I am staying away from...

    For greatest portability, I am staying away from functionality in various ROMs.

    FLEX for the 680x allocates 128 bytes for the input buffer and another 128 bytes for the stack.

    It looks like a...
  25. There is a trick I learned while working on CP/M...

    There is a trick I learned while working on CP/M system software: build the code ORGed at two different locations and compare them. The bytes which differ are the ones needing adjustment when the...
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