> On Jul 29, 2023, at 12:45 PM, Chris Zach via cctalk <cctalk@classiccmp.org>
> wrote:
>
> Answering my own question: Yes it does work. My Pro/380 now sees 320kw of
> memory instead of 256kw.
>
> Now to buy some sockets and upgrade these boards to 256kw each. One can go in
> the Pro/350 and the other plus the memory boards should take my Pro/380 to
> almost 1kw.
>
> I wonder if the CTI memory boards can be upgraded from 64k chips to 256k
> chips. Probably would require reprogramming the ROM as well on the board. Hm.
The Pro Technical Manual (on Bitsavers) answers a bunch of these questions. If
I remember right, the 380 will accept 350 memory daugher cards but also
larger-capacity cards (bigger chips) that are 380 only. Also, the wiring for
the board allows for larger memories than what DEC actually built; the details
are in the CPU/Motherboard chapter of the manual. And/or in the schematics.
I've thought about building such a daughtercard, I think the best case allows
close to full 4 MB worth of memory.
paul
