You must be very old to remember this chip.
MC14500B was a metal-gate CMOS chip that, with its simple 16 instructions, could be the core of a PLC.
Apart from the datasheet of the chip and of the companion I/O chips, there was a booklet with a red cover that explained how to use it.
If someone has a PDF of that booklet ... I'd like to have a copy
Here is the chip image and the booklet cover
hi,
I have got an original of that book, its 106 pages long!
Also have 6 new MC14500B you can have, no charge.
PM me your address and I'll post them both off to you if you are interested.
If you prefer tell me which pages you want I will scan and post on the forum.