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

[Tony Duell]

> 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