10 Jul
2009
10 Jul
'09
5:46 p.m.
There wass never ECC memory as the logic for that likely exceeds
that of the PDP-8. There was 13bit Parity memory (I don't mean the oddball
13bit rom /ram mix device).
Allison
Subject: Re: DEC H207 Core Memory Boards
From: Ethan Dicks <ethan.dicks at gmail.com>
Date: Fri, 10 Jul 2009 19:43:52 -0400
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On 7/10/09, Brent Hilpert <hilpert at cs.ubc.ca> wrote:
While the use of the H207 has apparently been
determined, out of curiousity was
there ever any ECC core memory for the PDP-8?, it might have have had a width
of 16 or 17 bits.
I have never seen ECC core for any DEC machine (but don't take that as
the definitive answer). The PDP-8/L, though, was commonly shipped
with parity (there's space in the CPU chassis that's pre-wired for the
parity support cards and the slots for the core sense/inhibit wires
are wired for 13 bits). It might also be supported in the -8/i, but
I'd have to look that up (I know about the -8/L for certain because
one of mine arrived with that option populated).
-ethan