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From: werner@ut-ngp.UUCP (Werner Uhrig)
Newsgroups: net.micro.mac
Subject: Re: Schematics for Mac? [REALLY: info about PALs]
Message-ID: <2655@ut-ngp.UUCP>
Date: Wed, 27-Nov-85 04:04:09 EST
Article-I.D.: ut-ngp.2655
Posted: Wed Nov 27 04:04:09 1985
Date-Received: Fri, 29-Nov-85 21:26:45 EST
References: <12900001@hplvle.UUCP> <27800004@ada-uts.UUCP> <347@mhuxl.UUCP>
Organization: UTexas Computation Center, Austin, Texas
Lines: 16

> What I would really like to know, is what's inside the PAL's.  "IM
> Underground" leaves the PAL's as black box's.  And how about what's in
> that IWZ box?  Does anyone have that information??

The October 1985 Issue has a most interesting article addressing exactly
this topic (and which I ran into last night, playing "catch-up" ):

see page 44, "ELECTRICAL MAC - PAL Technology Explained" by Jeff Mitchell.
it explains the different technologies of PLDs (programmabable logic devices),
in general, and the 6 HALs in the MAC in particular.

lucky you asked about it today, tomorrow might have been too late already
for my aging brain .....  ((-:

MacTutor, P.O. Box 846, Placentia CA 92670  (714)993-9939
or at your local MAC-hacker-store (or it doesn't deserve the compliment)