(no subject)

From: Larry Mollica (larry-2004_at_pacbell.net)
Date: 2004-04-12 21:44:16

Hi all. I'm wondering if anyone has experience with, or knows of a source of
information regarding using the PET to control Hewlett Packard test equipment.

I need a way to send specific "bus commands" to the HP gear.
From what I gather, bus commands are essentially like sending regular data
except that the ATN line is held low. If there's a way to do this within PET
basic, it has escaped me.

I'm thinking that it should be possible to brute-force bus commands by POKEingto
the PIA such that it simulates sending data with ATN low. It could probably
cheat some steps too, like using a timing loop rather than looking for proper
bus hand shakes, etc. There are only a few bus commands I need to send, mostly
to release control of the instrument front panel.

I'm hoping someone has already figured this out and knows how to do it...


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