30 Oct
2005
30 Oct
'05
5:09 p.m.
The 1969 Motorola Semiconductor Data Book lists the
MC1806 as
DTL quad 2 input AND gate (no inversion), pinout as you inferred (outputs 3,6,8,11).
Argh, I have the 1968 databook (seriously!).
I am suprised it's an AND gate, but it could make sense. Basically, there
has to be a way to force the output low (to turn off the transistor
connected there, which drives an HPIB data line). That means it has to be
an AND or a NOR gate. Turns out I was wrong guessing the data had to be
inverted going through this gate.
Thanks for the info, I'll figure out the rest of the board...
-tony