25 Jan
2004
25 Jan
'04
3:39 p.m.
David,
The PDP8/A did not use a microprocessor. It was TTL SSI/MSI like the 8/E,
though
ia different design and packaged more densely. The 8/A replaced some random
logic
with small ROMSs, and later models used semiconductor memory instead of
core.
All subsequent models, e.g., vT78 and DecMate, were microprocessor-based.
--Bill
----- Original Message -----
From: "David V. Corbin" <dvcorbin(a)optonline.net>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Sunday, January 25, 2004 3:56 PM
Subject: RE: PDP Manual on eBay
Actually that (I am pretty sure) is a version that
focuses mainly on the
PDP-8/a which was microprocessor (rather than discrete component) based.
Earlier editions (which had more information on Flip-Chip based
designs),are
much more useful to those intersted in older
PDP-8's (/I /E /L /M /S).