PDP-11/20 in Iowa (x3)

steven at malikoff.com steven at malikoff.com
Mon Mar 27 17:35:48 CDT 2017

>> On Mar 27, 2017, at 9:15 AM, Ethan Dicks via cctalk <cctalk at classiccmp.org> wrote:
>> Was there ever a quad MOS memory board for the 11/20?  It would have
>> to be 4K or less, I'd expect, given the era and size of RAM.  I know
>> by a few years later, with the 11/04, MOS was becoming common.
> I don't know of MOS memory appearing in 11/20s as built by DEC, but there's no reason against it.  It's just Unibus memory.  It wouldn't have to be 4k either; if you had a 32kW memory card that should work just fine.
> 	paul

After seeing this modern memory board project for the PDP-8/e using NVRAMMs
I wonder how much effort it would be to refactor the Omnibus logic to Unibus
to build a PDP-11 version, and thus have a quad size card for /15's and /20's?


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