29 Jul
2023
29 Jul
'23
10:36 a.m.
On Jul 29, 2023, at 12:45 PM, Chris Zach via cctalk
<cctalk(a)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