Re: II+ beeps but then reacts very oddly

[Linards Ticmanis <ticmanis@gmx.de>]

Hello Michael,

Michael J. Mahon wrote:
> LS TTL is remarkably reliable and resistant to damage, which is why
> it's always the *last* thing I consider as the source of a problem
> (unless it's charred  ;-).

Well, it was a 74S chip that was broken, not a 74LS. Are the S variants
less durable?

> And pulling chips wholesale and replacing them is the setup for a
> mistake that will change a single-fault problem (easily localized)
> to a multiple-fault problem that is very difficult to localize.

You'll have to admit though that the problem "absolutely no reaction at
power on" is not *that* easy to localize without a 'scope - or am I
mistaken in this?

Best Wishes,
-- 
Linards Ticmanis