DEC H207 Core Memory Boards

[Allison]

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