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Type: Posts; User: Ruud

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    There are several solutions: - my own CBM-HD...

    There are several solutions:
    - my own CBM-HD. Takes some work but is cheap (Ja, ik ben een Hollander :)).
    - Zoomfloppy, store.go4retro.com › zoomfloppy
    - PetSD

    Have fun!
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    If it has a Dutch manual, it does not mean it has...

    If it has a Dutch manual, it does not mean it has been imported from the Netherlands. In Flanders it was common to order your computer with a US keyboard instead of a French one. In those days there...
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    It seems that I did not mention that I would be...

    It seems that I did not mention that I would be using timer 0. IMHO I cannot use the other timers because another program or even a part of the actual program may need them. So that only leaves me to...
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    OK, I wrote a new "1 ms. delay" routine: ;**...

    OK, I wrote a new "1 ms. delay" routine:


    ;** Delay 1 millisecond
    ; 1 ms. is equivalent to (65536 / 18.2065 = 3599.59) = 3600 count downs
    ; from register 0 of the 8253 timer
    Delay1ms:...
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    The main reason I used the count down loop is...

    The main reason I used the count down loop is that I'm a lazy person and this method was easier to implement. That TP used it just backed up that decision. Because of this run time error I added DX...
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    I'm working on a P4-i5 but the target machine for...

    I'm working on a P4-i5 but the target machine for all of my projects mentioned on this forum is an 8088/8086 equipped computer. These mainly will be IBM-PC/XT compatible computers but one of my...
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    Very good remark! I had not think about the last....

    Very good remark! I had not think about the last.


    I disagree. A faster CPU will just will count faster and so my initial test will get higher values for CX and DX. TP3 only uses counting down...
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    I'm writing my own Turbo Pascal compatible...

    I'm writing my own Turbo Pascal compatible version, just for fun. And it has this "Wait" function which use a 1 ms. loop.

    I have indeed thought about checking the 8253 timer registers directly....
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    Unfortunately a wrong assumption :( When doing a...

    Unfortunately a wrong assumption :( When doing a divsion, in this case DX:AX div BX, AX becomes the result and DX the remainder (and not the high-word as I thought). This means the initial DX can be...
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    Calculating the number of loops for 1 ms.

    I was wondering if this thread should be in the Hardware thread or here. I needed a way to calculate the length of one millisecond in the form of counting a loop. I used a method I used, more or...
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    In the thread, please.

    In the thread, please.
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    That is something I realized later. I always...

    That is something I realized later. I always thought you wanted the Diagnostic ROM as is PLUS serial support. The above idea has its advantages and disadvantages.

    The biggest advantage: during the...
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    I have downloaded it and tried to disassemble the...

    I have downloaded it and tried to disassemble the ROM. "Tried" because there is something that makes it hard to disassemble the code. But I think I already have the idea what the ROM does: what ever...
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    I only have seen the brown one so far so it could...

    I only have seen the brown one so far so it could be possible that the green one is the wanted one. The only differences are frequencies of various used ICs and crystal. If the 808286 is a 6 MHz one,...
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    Thank you!

    Thank you!
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    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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