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Type: Posts; User: Ruud

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  1. Using no labels and other fancy stuff means you...

    Using no labels and other fancy stuff means you only need a little bit of memory and that will be a fixed amount IMHO. That's why most monitors fit nicely in the $Cxxxx block. Some even tell you what...
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    IMHO if it is able to communicate with one IEEE...

    IMHO if it is able to communicate with one IEEE drive, it should work for all IEEE drives. I have a small project, CBM-PC, where a PC emulates more or less a CBM. It is meant to create disk images by...
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    Having no experience at all it is good to hear...

    Having no experience at all it is good to hear this from someone who made the journey already. And a second thought: if needed I always can discard the non-FP routines.


    I already started to...
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    To be able to modify it, you need the sources. Or...

    To be able to modify it, you need the sources. Or am I missing something? And I don't have these sources. I did quite some Google to find them but I haven't found anything written in 80x86 assembly...
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    I was thinking about handling integers as...

    I was thinking about handling integers as integers, including their own mathematical routines. The advantage: easier and faster, the disadvantage: more code.

    [/QUOTE]As far as transcendental...
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    Sometimes things are so obvious for yourself that...

    Sometimes things are so obvious for yourself that you forget that they are not for others.

    It is meant to run on an IBM-PC (compatible) system with at least 64 KB. But I intend to store variables...
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    Thank you!

    Thank you!
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    Which means that all FP routines are taken care...

    Which means that all FP routines are taken care of by the C compiler. Or am I overlooking something?
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    Because it are fun projects and having a job, a...

    Because it are fun projects and having a job, a family, etc. progress is slow. So it could take years before having a working result. The state of the various projects:
    - My OS: it boots and you can...
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    What OS are you using? And do you own a 1541...

    What OS are you using? And do you own a 1541 drive? I had the weird experience that under Windows 7 I was able to read and write floppies with the 1541 but things didn't work for my 8250LP. Never...
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    First: this is purely a fun project. This BASIC...

    First: this is purely a fun project. This BASIC should be an interpreter. I'm also busy with my own Pascal compiler, written in Free Pascal. The end results should be able to run under my own OS....
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    Floating point info code for 8088 wanted

    I'm writing my own BASIC from scratch in 8088 assembly. The editor, the way the lines are stored and can be listed again seems to work fine. The next step is to write the code for the various...
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    One thing you can do as minimum is to connect the...

    One thing you can do as minimum is to connect the IORDY line to GND when starting up. This will halt the CPU. Then use a voltmeter to measure all address and data lines. The result should be 0FFF0...
  14. To be more specific: if lines have been shorted...

    To be more specific: if lines have been shorted in the inner layers, I would have no idea how to separate them again.

    I have a debugger that can show me if the CPU starts reading the BIOS ROM...
  15. Thread: 8050

    by Ruud
    Replies
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    2,023

    The same. 10 OPEN 15, 8, 15 20 INPUT# 15,...

    The same.


    10 OPEN 15, 8, 15
    20 INPUT# 15, A$, B$, C$, D$
    30 PRINT A$, B$, C$, D$
  16. Thread: 8050

    by Ruud
    Replies
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    Certainly a C64 program, not sure if it is for...

    Certainly a C64 program, not sure if it is for the VIC-20 as well.


    No. Your remark about "?file not found" is correct.
  17. Thread: 8050

    by Ruud
    Replies
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    In that case you are wrong. I'm sure that that...

    In that case you are wrong. I'm sure that that you have listed various games and in most case you see something like "2010 SYS 1959". You know the game is much bigger then the few bytes on the screen...
  18. Things work fine after a warm boot so IMHO the...

    Things work fine after a warm boot so IMHO the RTC IC is fine. Because it only goes wrong after the power has been turned off, the only thing I can think off is that the RTC IC doesn't get its power...
  19. Thread: Unknown PC

    by Ruud
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    I disagree. A MDA card would need 80*25*2 = 4000...

    I disagree. A MDA card would need 80*25*2 = 4000 bytes or TWO 6116 SRAMs. And this RCA IC doesn't look like a SRAM to me.

    Bottom-left the second and third IC above "MADE IN TAIWAN" you see two...
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    Today I removed the original 8237 and replaced...

    Today I removed the original 8237 and replaced with one coming from a working board. No difference, it won't boot. But I forgot to mention that you can hear moving the head so that part is working. I...
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    Different code, same type of RAM. Are you...

    Different code, same type of RAM.


    Are you sure about measuring 12 MHz? I just checked the data sheets and the 8284 divides the incoming clock by three, whether it is coming from the internal...
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    Some findings: - The manual doesn't mention the...

    Some findings:
    - The manual doesn't mention the possibility to place up to 1MB of RAM except the dip switch settings. Remark: the board on Modem7's site has a NEC chip, my board has a VDL one. It...
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    Hallo Tronix and dkedrowitsch, Thank you for...

    Hallo Tronix and dkedrowitsch,

    Thank you for your information!
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    I have the impression that you think that it has...

    I have the impression that you think that it has an on board FDC. Except it has a V30 as CPU and being capable of driving 1 MB of RAM, it is a normal bare XT clone.

    Regarding the software: I have...
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    Unknown XT V30 board

    I found this V30 board, see attachment. On the back it just says "DS-11-02B". It is also capable of handling 1 MB. It has two EPROMs on board, as you can see. I expected them to be the odd and even...
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