Visit Don Lancaster's web site.
https://tinaja.com/
He wrote some great books on TTL logic and made clear a lot of questions
I had about digital logic when I first started out, as I was never
formally trained in electronics servicing or Boolean Logic.
Note he has many free ebooks!
John :-#)#
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(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."