5 Sep
2015
5 Sep
'15
11:25 a.m.
From william degnan
I was looking to see if references to the tm11 were
"module/card" or
backplane interface.
I think pretty much all that earliest generation of UNIBUS interfaces were
stand-alone backplanes (i.e. 19" wide things that went in an H960 in a fixed
location, and were filled with the small Flip Chip modules); the RK11-C,
RP11-C, RF11, and TC11 all are.
I surprisingly found little commentary or threads
about the TU10 /
TM11, other than DEC docs. I guess these are not super common
Yeah, I think they were the first PDP-11 tape drives - not as rare as RF11's
now, but pretty rare.
Noel
6 Sep
6 Sep
5:14 a.m.
On 2015-09-05 20:25, Noel Chiappa wrote:
Partly correct. All early Unibus controllers which did DMA had their own
backplanes. Which is why the NPR is obnoxious on the Unibus. Unlike the
BR lines, the NPR is normally always just jumpered in the backplane, and
located away from the BR lines. When DMA on single cards became more
common, this became an obvious issue on the Unibus. You have to cut the
wire on the backplane, and when you remove the card you either have to
reinsert the write, or get the bug grant card that is double height,
which also do the NPR jumper.
But non-DMA controllers were single cards even back in the early days of
the Unibus, like the DL-11.
(Early DMA controllers were all multiple cards, so having their own
dedicated backplanes were a pretty sane idea.)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
From william
degnan
I was looking to see if references to the tm11
were "module/card" or
backplane interface.
I think pretty much all that earliest generation of UNIBUS interfaces were
stand-alone backplanes (i.e. 19" wide things that went in an H960 in a fixed
location, and were filled with the small Flip Chip modules); the RK11-C,
RP11-C, RF11, and TC11 all are. 
5:21 a.m.
I am going to see if I can find the card inventory and installtion guide
info for the TM11 so that I can confirm whether I indeed have one
installed in the TU10'S cabinet. So far I have found little.
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Sep 6, 2015 8:14 AM, "Johnny Billquist" <bqt at update.uu.se> wrote:
On 2015-09-05 20:25, Noel Chiappa wrote:
Partly correct. All early Unibus controllers which did DMA had their own
backplanes. Which is why the NPR is obnoxious on the Unibus. Unlike the BR
lines, the NPR is normally always just jumpered in the backplane, and
located away from the BR lines. When DMA on single cards became more
common, this became an obvious issue on the Unibus. You have to cut the
wire on the backplane, and when you remove the card you either have to
reinsert the write, or get the bug grant card that is double height, which
also do the NPR jumper.
But non-DMA controllers were single cards even back in the early days of
the Unibus, like the DL-11.
(Early DMA controllers were all multiple cards, so having their own
dedicated backplanes were a pretty sane idea.)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
From
william degnan
I was looking to see if references to the tm11
were "module/card"
or
backplane interface.
I think pretty much all that earliest generation of UNIBUS interfaces were
stand-alone backplanes (i.e. 19" wide things that went in an H960 in a
fixed
location, and were filled with the small Flip Chip modules); the RK11-C,
RP11-C, RF11, and TC11 all are.
3621
days inactive
3622
days old
2 comments
3 participants
participants (3)
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billdegnan＠gmail.com -
bqt＠update.uu.se -
jnc＠mercury.lcs.mit.edu