Need DOS 3.3 to restore a PC based instrument

From: Stan Perkins <>
Date: Sun Nov 28 11:41:06 1999

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,
Received on Sun Nov 28 1999 - 11:41:06 GMT

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