For the reason
already stated (HP would call it 'HPIB', not 'GPIB' or
'IEEE')_, I doubt it's an HP machine. Although to be honest, HP tended
to
just use a SEND command unless it as an HP9830 when it was CMD.
HP may well not have used the IEEE ref, but I would think the code was
more likely written by the end customer or the assembler of the ATE
system, not HP.
Possible, but HP users tended to have the 'HPIB' name ingrained into
them...
For alternatives, what other companies made HPIB/GPIB/IEEE controllers?
At that time, I would guess Tektronix did. Possibly Fluke? Actually just
about anyotne in the ATE buisness would have done, surely?
-tony