Need DOS 3.3 to restore a PC based instrument

From: Richard Erlacher <>
Date: Sun Nov 28 13:44:57 1999

In case you can't get the right dos version right away, perhaps you could
try loading SETVER. That should work with your later DOS version.


-----Original Message-----
From: Stan Perkins <>
To: Discussion re-collecting of classic computers
Date: Sunday, November 28, 1999 10:49 AM
Subject: Need DOS 3.3 to restore a PC based instrument

>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 - 13:44:57 GMT

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