20 May
2018
20 May
'18
11:13 a.m.
From: Bob Smith
8110 for MOS memory, and 8120 for bipolar memory is
what field guyde
list says.
Well, the early bipolar MS11-C (1K boards) used the M8110 during early
production (see e.g. DEC-11-HMSAA-D-D, pg. 1-1), and apparently then switched
over to the M8120. I've only seen the later MS11-A bipolar (4K boards - dunno
why it's in reverse alpha order) associated with the M8120.
I think the there was some change from special select
parts and a move
to schottky 74S series around the time of the 45/50 days.
I wondered that, but the MS11-C and MS11-A are the same speed (300 nsec);
although maybe the M8110 was a bit marginal, and component changes in the
M8120 made it more robust?
I guess I'll have to do it the hard way, and compare the ICs... :-(
11/40 was faster than 11/35, but if you changed a
wire, they were the
same.
I've heard of other manufacturers doing that, but I thought the /35 and /40
were identical, except for the number on the console inlay, and the sales
channel?
Noel
21 May
21 May
9:24 a.m.
11/35 vs 40, I think there was some attempt to discriminate between
the two, as the /35 with no added boxes was a great little machine
cost and performance wise, I recall the timing being different when
going through the prints for the two machines, got parts for 35 out of
surplux, checked the backplane and there was one wire different, fixed
it toe match /40 and we gave away the machine as a retirement gift to
one of the guys who was starting somekind of boat shop in Maine, can
remember his face. maybe his name but that was a long long time ago!!
bb
On Sun, May 20, 2018 at 2:13 PM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
From: Bob
Smith
8110 for MOS memory, and 8120 for bipolar memory
is what field guyde
list says.
Well, the early bipolar MS11-C (1K boards) used the M8110 during early
production (see e.g. DEC-11-HMSAA-D-D, pg. 1-1), and apparently then switched
over to the M8120. I've only seen the later MS11-A bipolar (4K boards - dunno
why it's in reverse alpha order) associated with the M8120.
I think the there was some change from special
select parts and a move
to schottky 74S series around the time of the 45/50 days.
I wondered that, but the MS11-C and MS11-A are the same speed (300 nsec);
although maybe the M8110 was a bit marginal, and component changes in the
M8120 made it more robust?
I guess I'll have to do it the hard way, and compare the ICs... :-(
11/40 was faster than 11/35, but if you changed a
wire, they were the
same.
I've heard of other manufacturers doing that, but I thought the /35 and /40
were identical, except for the number on the console inlay, and the sales
channel?
Noel
2407
days inactive
2408
days old
1 comments
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