26 Sep
2012
26 Sep
'12
4:25 p.m.
On Wed, Sep 26, 2012 at 3:06 PM, Paul Anderson <useddec at gmail.com> wrote:
I might have a bunch of thek here, but I don't
remember tha paet number.
From the PDP-11 Field Guide:
M8728-AA MK11 U 64-Kword 39-bit MOS memory array (11/70, 11/750)
M8728-AA (Also M8728-AB, -AC, -AD, -AE, -AF, -AH, -AK, -AM,
M8728-AA -AN)
M8728-CM MK11 U 16-Kword 39-bit MOS memory array (11/70)
M8728-CM (Also M8728-CN)
As mentioned, the 256Kbyte card works in the PDP-11/70 _and_ the
VAX-11/750, but the VAX only has eight memory slots, so that's a max
of 2MB. ISTR when originally shipped, the 11/750 came with two cards
standard. You had to purchase the next six separately. My 11/750 S/N
BT000354 was originally delivered that way, then upgraded to 2MB
before I first saw it. I added the wire and newer memory controller
board (and fiddled the SID switchpack) to let it take 1MB modules,
boosting it to 8MB.
I probably still have the original memory, in static bags, untouched
since it was removed in the late 1980s. I will be going through that
(indoor) storage this fall and keep an eye out.
The most I would have would be a half-load for an 11/70.
-ethan