Apple II hardware design

From: A.R. Duell <>
Date: Tue Jun 24 08:55:57 1997

> Signetic (I think it was them) had some PAL like devices back in the
> mid-1970s. I do not think they were as flexible as PALs, but they did
> combine the best of the PROM and glue worlds for decoding schemes.

Ah yes. The 82S100 and related devices. They were less flexible than later
PALs in that there were no flip-flops on the outputs and no internal
feedback terms, but were more flexible in that you could program both the
AND matrix (like a PAL) and the OR matrix (to decide how many (and which)
product terms to use for each output).

> William Donzelli

The gates in my computer are AND,OR and NOT, not Bill
Received on Tue Jun 24 1997 - 08:55:57 BST

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