15 Nov
2004
15 Nov
'04
3:02 p.m.
PROMS, I suppose). Some of the 74L and 74H chips are
getting difficult to
find, but these are the chips that never were popular (like the expanders
and AOI gates).
Thay may not have been popular, but they were used. The HP98x0 processor
(bit-serial, 16 bit) has a 74H52 on one of the memory control boards as
the mux at one input to the ALU and a 74H54 with an expander (I forget
which, and I don't feel like grabbign the schematics) on the processor
data path PCB as the mux at the other ALU input. They do fail (the former
especially!).
-tony