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  1. Replies
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    Regarding System Commander: does anyone have a...

    Regarding System Commander: does anyone have a version number that should work on 8088 PCs? WinWorld can provide versions starting form 2.26 and higher.
    Thanks!
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    First for everybody: thank you for reacting! Your...

    First for everybody: thank you for reacting! Your comments gave me a lot of input and a better insight how I can handle files.


    I already reserved some routines for handling files, including...
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    When is the FAT saved?

    Hallo allemaal,

    Background: I'm writing my own OS with its own File System, just for fun. When adding or deleting files, the BAM (Commodore equivalent of the FAT) has to be edited when ever a...
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    ruud @ baltissen . org

    ruud
    @
    baltissen
    .
    org
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    171

    I think there is a small misunderstanding. The...

    I think there is a small misunderstanding. The image will be a file about 160 KB big and can be sent by email. So no blank floppy needed.

    Please visit my site to obtain my personal email address.
  6. Thread: Make my own 5150

    by Ruud
    Replies
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    333

    More or less, yes. To be honest, I was thinking...

    More or less, yes. To be honest, I was thinking about a board with only standard ICs. My reason: the chance that they are available is much higher then any 'old' ASIC or other type of custom IC. But...
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    To be able to run MADS inside VICE you will need...

    To be able to run MADS inside VICE you will need a disk image where you can load it from. When using a 1541 inside VICE that must be a D64 image. So use google or another program to search internet...
  8. Thread: Make my own 5150

    by Ruud
    Replies
    6
    Views
    333

    Hmmm, just popped up: what about a board that...

    Hmmm, just popped up: what about a board that fits into an ATX-case? Just an idea :)
  9. Thread: Make my own 5150

    by Ruud
    Replies
    6
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    333

    I just happen to have the schematics of the 5160...

    I just happen to have the schematics of the 5160 in Eagle, although not complete: it only has two slots instead of the original five. Just blame my laziness. No board. It isn't a 5150 but if you...
  10. As an addition, By dividing it by two you get the...

    As an addition, By dividing it by two you get the 14,318 MHz needed for the ISA bus and the onboard CGA card. So I cannot advise you to replace it with a faster oscillator.
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    Question: could you open the case so we could...

    Question: could you open the case so we could have a look inside, please? With these printer cartridges I'm always interested in what hardware they use.

    I had some of these cartridges and IIRC...
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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!
  13. Replies
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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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