How to set up an old PC to run LAPDOS

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Revision as of 12:09, 24 December 2008 by 130.15.90.160 (talk) (New page: == Creating a PC for use with LAPDOS and PDD.EXE == Hello! From time to time I have needed to put together a PC capable of running both LAPDOS and PDD.EXE, for accessing data on a TPD...)
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Creating a PC for use with LAPDOS and PDD.EXE

Hello!

From time to time I have needed to put together a PC capable of running both LAPDOS and PDD.EXE, for accessing data on a TPDD.

Typically, I have some Pentium class computer lying around, so that is what I have used. I cannot confirm that anything newer that this will work, but I would bet that a Pentium III would still work. My standard needs are 1-2 serial ports, a small hard drive, and a floppy, and I typically use DOS 6.22.

My current system for this is a K6-3 400 on a Super 7 PCB (100MHz clock rate). Ridiculous overkill.

The key thing to do, is to slow down the CPU so that it runs at a similar pace to a PC from 1987 ish. There are 2 things I do.

1) I disable the on-chip cache on the CPU. This is done from the bios of the PC. 2) I run SLOWDOWN V 3.10 from Bret Johnson. See the link below.

http://bretjohnson.us/

For settings, I use the following command in autoexec.bat-

slowdown /c:no /s:100


That is about it. If when running either LAP.EXE or PDD.EXE, you have timeout problems when accessing the TPDD, or the TPDD cannot be found, try slowing down the system further with a smaller number than 100.

Give it a try.

cheers, Steve Adolph.