21 Feb
2007
21 Feb
'07
4:07 p.m.
Is there
anyone here who knows enough about typical HPIB hardware of
the hp300 era to be able to take a list of chip markings and tell me
which one is probably the relevant driver?
What I would do is trace back from the
data pins of the HPIB
connector (IIRC that's pins 1-4 and 13-16 of the 24 pin Microribbon
connector). On most modern-ish machines (anything since the 9830
:-)), there is only one chip connected to those lines, and that's the
HPIN data buffer. One common
type is the 75160, which comes in a 20 pin DIL package, or
I guess some kind of SMD thing.
This hardware is entirely through-hole DIP. Not a suface-mount part in
sight. Fairly low-density through-hole DIP, too - on a board measuring
17x14 cm, there are only 31 chips: one of 48 pins, three of 20 pins,