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

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue Nov 16 18:20:36 2004

>
> Paul Koning wrote:
>
> > Tore> But access to a complete array of spares if nessecary. Oh, and
> > Tore> the CPU is built in TTL logic, so no hard-to-get spares.
> >
> > TTL is getting hard to find, especially the more obscure types such as
> > 74S series. (And if the book says they want 74S, it's quite possible
> > no other variant will work...)
> >
> > paul
>
> I thought that 74F series parts were generally replacements for 74S
> parts. Is this incorrect? A more serious concern is that the parts

'Generally' is right. 9 times out of 10 you can use 74F in place of 74S
(if the right function exists, which is by no means certain). The tenth
time, the F part is too fast, or causes too much ground bounce, or ...

-tony
Received on Tue Nov 16 2004 - 18:20:36 GMT