Testing Power Supplies! Re: Norsk Data Nord-10/S restoration

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Mon Nov 15 23:02:25 2004

> 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
Received on Mon Nov 15 2004 - 23:02:25 GMT