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How to slow down the bus speed ?

Discussion in 'Electronic Design' started by AndyS, Jun 16, 2007.

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  1. AndyS

    AndyS Guest

    I have a Modular Circuit Technology EPROM programmer that
    I bought 15 years ago, and used with a PC-XT 4.77 Mhz and
    it worked well.

    However, I no longer have the old XT and would like to use the
    programmer with a later model computer.

    The problem is that the programmer cannot be used with a
    system that has a bus speed of above 8 Mhz...

    So, does anyone here know whether or not there is a software
    program that will slow down a computer's bus speed, maybe by
    using wait states or something, that will enable me to use
    the programmer with a more modern computer ?

    Perhaps, if this isn't the right group to ask, someone could
    tell me about a computer newsgroup where I could ask.

    Thanks for any advice you may have.

    Andy W4OAH
  2. Guest

    People laugh at me when I dumpster dive or pick old PC's
    out of the trash and take them to my warehouse. I still have
    customers who are running DOS. The proprietary software
    they have won't run on modern systems. I have seen some
    software for the avid overclocker crowd that allows all sorts
    of adjustments to motherboard buss speeds that could be
    useful to you but I have not used any of it. You may have
    to bite the bullet and cruse the thrift stores and recyclers
    to find suitable hardware.

    "Command line", never forget.

    [8~{} Uncle Monster
  3. Jamie

    Jamie Guest

    Hmm, is it possible that the software you're using has the
    problem and not the hardware?
    I do remember back in the Turbo Pascal days of using the
    Delay function. It used CPU counting, that program would fail
    on faster machines because it would over flow .

    You could call it built in obsolescents.
    The fix was, I wrote my own CRT unit and used the tick timer
    If you know the programming sequence to the programmer, I'm sure
    it would be simple to whack out a program to dump a bin file to the
    I suspect that the software you're using must be using a delay loop
    when communicating with the COM/Parallel port. Because that was a common
    thing back then.
  4. AndyS

    AndyS Guest

    Jamie wrote:> I suspect that the software you're using must be
    using a delay loop
    Andy writes:
    It says SPECIFICALLY in the manual that it cannot be used with
    bus speed of greater than 8 Mhz.

    While I know it is possible to trace out the circuit and write a
    program that
    will run thru a printer port to simulate a low speed computer, I have
    retired and
    am too damn lazy to start a project like that from scratch..

    I just want to see if there is a way to load a "MODERN" program
    with a
    patch that will automatically provide a couple of hundred wait states
    after each
    instruction and allow the effective bus speed to be below 8 Mhz.....

    Yeah, I know,..... but I am too damn old to be smelting my own ore
    get the metal to build a screwdriver......

    Thanks , tho, for your post...... My background is both hardware
    and software,
    but I don't have the enthusiasm to pursue the building of new tools
    Hell, I'd probly just use flint arrowheads if I could get away with
    .... which is why I don't just pay $500 for a new programmer that will
    replace the
    one I have.... :>)))

  5. joseph2k

    joseph2k Guest

    I have an old ISA bus device programmer as well. I haven't had an ISA slot
    to plug it into for some time now. My new programmer is USB2, it cost me
    about U$200. Decide whether to support antiques, or support newer stuff.
  6. JeffM

    JeffM Guest

    Wait states are set in CMOS Setup.
    AFAIK the most ever available is 3.

    Here's what AMD has to say:
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