20 Feb
2007
20 Feb
'07
7:15 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,
fourteen of 16 pins, and and thirteen of 14 pins (well, thirteen 14-pin
DIP packages; I think two are resistor packs rather than logic), plus
two ten-pin SIP resistor packs, a two-switch DIP switch bank, a
five-switch DIP switch bank, a small pot, four discrete resistors,
seventeen discrete capacitors, and a crystal oscillator. Oh, and
card-edge fingers on one side and a back panel with an HPIB connector
on the other.
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B