6 Nov
1999
6 Nov
'99
8:55 a.m.
Backplane #1 (working from right to left as seen from
the front)
M8266 (6)
11/34A control
M8265 (6)
11/34A data paths
M8267 (6)
11/34A FP
M7859 (4) M9312 (2)
Console interface and bootstrap/terminator
M7896 (6)
My book says the M7896-YA is a quad board, and is a DSS11 with 48 24V
contact sense inputs. This doesn't match up with what I'd expect here,
nor your description of it as a hex-height board. Can you double-check
this one? I suspect that it's actually a memory board...
M7856 (4)
DL11 async line interface
M7228 (4) M920 (2) ** bus jumper **
KW11-P real-time programmable clock
Backplane #2
M7800 (4)
M7800 (4)
KL11's
M7860 (4)
M7860 (4)
DR11-C's (general purpose parallel input/output)
M7892 (4)
TU60 interface
Dual D/A converters (third party) (6)
Grant card
M8716 (4) M9202 (2) ** bus jumper **
DR11-W, DMA parallel input/output
Backplane #3
M7219 (4)
RC11 bus interface
M7821 (3?)
Interrupt control
M796 (1)
Unibus master control
(hidden) (2)
M9760 (2)
60-wire cable, presumably running to a drive.
M9302 (2)
Terminators
In this last back plane there are several cards that
are dual or one wide
and are short with white extension things over them so that they can be
pushed from the top (but they hide the M numbers)
So it seems that this is actually an 11/34a on the inside, that's nice to
know. Anyone have any clues on the third backplane?
It looks to be at least part of the Unibus interface (RC11) for the
RS64/RS03/RS04 drives. These are head-per-track disks with capacities
of 64K, 256K, and 512K words respectively.
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927