MS11 M8110/M8120 controller card differences

Bob Smith bobsmithofd at
Sun May 20 12:05:14 CDT 2018

Had to look it up, 8110 for MOS memory, and 8120 for bipolar memory is
what field guyde list says.
I think the there was some change from special select parts and a move
to schottky 74S series around the time of the 45/50 days.

but my memory could be wrong - 11 group did a bit of rebranding with
model numbers and parts change, 11/40 was faster than 11/35, but if
you changed a wire, they were the same.

On Sun, May 20, 2018 at 8:49 AM, Noel Chiappa via cctalk
<cctalk at> wrote:
> So I notice that M8120 controller card for the MS11 seems to share its etch
> with the earlier M8110 variant (the M8120 says "M8110" in the etch :-); so the
> differences must be component/configuration/ECO. Does anyone happen to know
> what the differences between the two are? Thanks!
>      Noel

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