Re: Motherboard chip descriptions?

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

"Ernest" <leucoplast@seanet.NOSPAMS.com> writes:
> Does anyone know of a book or website that describes what each of the
> different ICs (74LS* chips) on the Apple II and clone motherboards do?

TTL Databook for Design Engineers, Second Edition, by Texas Instruments.
Long since out of print, but you should be able to find a used copy.

Alternatively, just go to http://www.ti.com/ and type the part numbers
into the search box (one at a time).

None of the 74xx TTL chips in the Apple II are very obscure.  Probably
the most difficult to find information on at this late date will be
the DP8304 bus buffers used in some revisions, but they are very similar
to the 74LS245.

Also note that some 74xx chips have non-74xx equivalents.  For instance,
the 9334 and 74LS259 are interchangeable 8-bit addressable latches.