Need DOS 3.3 to restore a PC based instrument

From: Sipke de Wal <>
Date: Tue Nov 30 15:13:26 1999

Did you try the "setver.exe" utility on the .exe files of that
It kinda cheats the apps to think that it is running an older version
of DOS.

Sipke de Wal

Stan Perkins wrote:
> Hello all,
> I have just acquired a PC-based instrument. It's a Model DTA 8850
> Digital Timing Analyzer, made in 1989 by a company called International
> Test Instruments, Inc. in Irvine, CA. Unfortunately, they seem to be out
> of business.
> The machine is based on a PC architecture, with the specialized signal
> conditioning circuitry on a backplane. It has some sort of non-volatile
> electronic disk as the C drive. I was able to determine that the
> operating system is DOS 3.3, but there is something munged about it,
> because it won't run the application software for the instrument. I can
> boot the instrument from a floppy, but the only version of DOS I have is
> 6.22, and the instrument gives "Incorrect DOS Version" error messages
> when I run the application software (but it does run).
> I would like to get a copy of DOS 3.3 to restore this machine to its
> original state. Also, does anyone know anything about International Test
> Instruments, or (fingers crossed) have a manual or other information
> about this machine?
> Thanks in advance,
> Stan
Received on Tue Nov 30 1999 - 15:13:26 GMT

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