11 Nov
2014
11 Nov
'14
9:12 p.m.
From: Paul Anderson
The first board is definitely a DEC core board. If it
will help anyone
I can pull a MM8-A and MM11-D and compare them to the pic to see which.
That would be really useful.
If I had to bet, I'd go with the 8: DEC SPC/MUD memory boards often have CA1
jumpered to CB1 (NPG), and I don't see that here. And the way CC1 is ganged
to CF1 to CT1 is very odd - CC1 is Parity A in an SPC/MUD slot. (Yes, it
could be for a specially wired system unit - but those don't usually use hex
cards.) And then there are a number of different kinds of component (e.g. the
transistors in the cans, TO-18 I think?) which seem to be in multiples of 12.
Too bad there's no picture of the edge of the handles to give us an M-number!
Noel
11 Nov
11 Nov
10:11 p.m.
A clearer pic of the rear of the board would have been nice. I compared it
to an MM8-AB and that appears to be what it is.
On Tue, Nov 11, 2014 at 11:12 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
From: Paul
Anderson
The first board is definitely a DEC core board.
If it will help
anyone
I can pull a MM8-A and MM11-D and compare them to
the pic to see
which.
That would be really useful.
If I had to bet, I'd go with the 8: DEC SPC/MUD memory boards often have
CA1
jumpered to CB1 (NPG), and I don't see that here. And the way CC1 is ganged
to CF1 to CT1 is very odd - CC1 is Parity A in an SPC/MUD slot. (Yes, it
could be for a specially wired system unit - but those don't usually use
hex
cards.) And then there are a number of different kinds of component (e.g.
the
transistors in the cans, TO-18 I think?) which seem to be in multiples of
12.
Too bad there's no picture of the edge of the handles to give us an
M-number!
Noel
3698
days inactive
3698
days old
1 comments
2 participants
participants (2)
-
jnc＠mercury.lcs.mit.edu -
useddec＠gmail.com