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Thread: Tool to slowdown?

  1. #1
    Join Date
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    Default Tool to slowdown?

    Hello, is there a software tool which can slowdown an XT a little bit? For example if a game runs to fast on a 8/10 MHz 8086/V30 machine?

  2. #2

    Default

    There is SLOWDOWN.COM written by Charles Petzold in 1988. It was written for the AT but it could be good for a 'fast' XT as well. It's small, simple and works. Give it a try to see if you like it.

    https://books.google.com/books?id=Xr...page&q&f=false

    I have the compiled .COM file if you want it.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  3. #3
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    Default

    Quote Originally Posted by Stone View Post
    I have the compiled .COM file if you want it.
    Yes, please.

  4. #4

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    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  5. #5

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    What machine is it? Most of those faster XT clones had built-in ways for slowing them down, for the sake of compatibility. If not a turbo button, then a key combination.

    Petzold's SLOWDOWN won't work with every game/program (as he notes in the article), and when it does, I suspect that the method he uses will result in a rather "choppy" type of slowdown.
    int10h.org :: :: :: blog

  6. #6
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    Default

    Thanks, I will try it. It's Olivetti M24/M24SP/M240, they don't have a built in throttle.

  7. #7

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    Let us know how you make out.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  8. #8

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    FWIW...an old thread....

    https://www.vogons.org/viewtopic.php?t=44

    NB...Your mileage may vary...

  9. #9
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    Default

    Slowdown.com works by toggling IRQ8, which services the real time clock. The interrupt and the real time clock are part of the AT architecture, which also supports a 286 at a minimum. The OP is using an Olivetti M24 SP or M240, which uses a 10MHz 8086 and something closer to the XT architecture. Although the Olivetti does support a real time clock, I do not believe it supports the upper IRQs, so slowdown should do nothing with it.
    My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

  10. #10
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    Default

    Yes, just tested, you are right, slowdown.com has no effect.

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