Re: Need an 8280 formatted 8" disk

From: Francesco Messineo <>
Date: Mon, 13 Feb 2017 20:18:45 +0100
Message-ID: <>
> BTW, Frank:
> I watched your very nice video about repairing your 3032 and am just curious: how did you hold the camera, and what software were you using to test the IEEE port?

I have a tripod, but I used it only on the oscilloscope waveform
parts. Other bits were all filmed with the camera on one hand :(
Placing the tripod in a convenient location each time would steal too
much time and I mostly work on this in the night or spare time.
The IEEE port was tested with a small basic program that I've found on
the "PET and the IEEE488 bus" book, that can be found with a google
search (otherwise I can share it).
Since I saved it on tape, I can also transfer the program with cbmlink
and share it to anyone who doesn't want to manually type the program
The only signal that can't be tested by the program is SRQ (afair)
since it's input only to the PET. All other signals have separate
Input and Output lines, that connect together at the bus drivers
(either MC3446 or "discrete" open-collector drivers).
I'm going to hook some HP instruments to the IEEE488 bus and try to
program them via basic commands, as the book suggests.

Frank IZ8DWF

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Received on 2017-02-13 20:02:16

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