>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_at_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
Received on Sat Nov 06 1999 - 16:55:30 GMT