MEM11A questions

Mike Ross tmfdmike at
Mon Mar 7 16:06:28 CST 2016

On Tue, Mar 8, 2016 at 10:46 AM, Guy Sotomayor <ggs at> wrote:
>> On Mar 7, 2016, at 1:27 PM, Mike Ross <tmfdmike at> wrote:
>> On Tue, Mar 8, 2016 at 8:16 AM, Guy Sotomayor <ggs at> wrote:
>>> Hi,
>>> Over the weekend I was looking through some old CAD files and came across my
>>> original design for the MEM11A.  It was an SPC board that contained only 128KW
>>> of FRAM.
>>> I’m wondering if there’s any interest in that board.  I do have to iterate on the design
>>> a bit but I should be able to get something ready sooner than with my current board
>>> design (plus I know it will fit in an SPC form factor because I’ve already done it).
>>> What I’d like to know from folks is if there’s interest in that design?  Would there still
>>> be interest in what I’m now calling UMF11 (Unibus Multi-Function)?
>> Ummm enlighten us a little more about what exactly it could do and
>> what machines it could be used in?
> MEM11A?  It can be used in any PDP11 that has SPC slots and will provide 128KW
> of non-volatile RAM.  I had originally gone down this road to provide memory for
> memory challenged machines (most notably the 11/20) but could be used in any
> Unibus PDP11.

Ah ok so it's a universal RAM board that will add modern reliable
Unibus memory to any -11 from the 11/20 on up?

I'll have six please! Preferably tomorrow! (It was the 'multifunction'
bit that confused me; I wondered if it was doing something else beyond

'No greater love hath a man than he lay down his life for his brother.
Not for millions, not for glory, not for fame.
For one person, in the dark, where no one will ever know or see.'

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