29 Jul
2023
29 Jul
'23
11:55 a.m.
I'll have to look that pro380 technical book up, I've always referred to
my XT100 documents but those were pre-release for the Pro/350.
Now for the real 50k question: Does the AVO socket next to it take the
same board format for the 8 bit color video memory? Anyone have a
picture of the AVO board?
It's the same size and the board fits. Maybe it had more space for 256kb
of memory chips for video RAM?
C
On 7/29/2023 1:36 PM, Paul Koning wrote:
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