PDP-11/20 in Iowa (x3)

Paul Koning paulkoning at comcast.net
Mon Mar 27 09:28:43 CDT 2017

> On Mar 27, 2017, at 9:15 AM, Ethan Dicks via cctalk <cctalk at classiccmp.org> wrote:
>> ...Haha, those low-brain comments!
>> User g4ugm: "have core memory... lower value"
> Indeed... I'm still kind of annoyed that the 11/20 I rescued from the
> dumpster at work in 1984 got mildly "souveniered" before I got it - at
> least one core plane went to another employee who wanted a
> wall-hanger.
> 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.


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