DEC H207 Core Memory Boards
IanK at vulcan.com
Mon Jul 20 13:54:03 CDT 2009
I just happened across a description of the MP8-E memory parity module. It uses another core stack to maintain parity data for all other memory installed in the machine. All core was 12-bit. Source: PDP8/e Maintenance Manual, Vol. 2. -- Ian
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> bounces at classiccmp.org] On Behalf Of Allison
> Sent: Friday, July 10, 2009 5:46 PM
> To: cctech at classiccmp.org
> Subject: Re: DEC H207 Core Memory Boards
> 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
> 13bit rom /ram mix device).
> >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).
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