RK11-C disk controller
The RK11-C is the earliest version of the RK11 disk controller. (Nothing is known of the -A and -B, if they ever existed as products.)
Like many of the earlier large peripheral controllers for the PDP-11, it was a large custom wire-wrapped backplane which bolted into the front of a 19 inch rack, such as an H960; into it plugged about 40 small M-Series FLIP CHIPs.
The backplane is wired for connection to a standard DEC indicator panel, but no inlay for such has even been sighted, although the RK11-C Engineering Drawings allow one to work out exactly what such an inlay would have looked like.
There is also a rare variant of the RK11-C, the 'Double Buffer' RK11-C.
Contents
RK11-C Board chart/count tables
The following tables give a listing of the Flip Chips used in the RK11-C, and their location in the backplane.
Module counts
(Drawn from module utilization drawing, confirmed in module count chart):
Single height boards:
- G736
- G740
- M002
- M105
- M111 2
- M112 5
- M113 7
- M115 3
- M116 3
- M117 3
- M119 2
- M121 3
- M141 2
- M149 10
- M161
- M163
- M203 4
- M205 3
- M207
- M208 2
- M214 3
- M216 5
- M236
- M238
- M239 2
- M304 3
- M307 3
- M405
- M611
- M617
- M623 3
- M782
- M784 3
- M796
- M797
- M798
Double height boards:
- M795
Module Utilization Chart
The Flip Chip module utilization chart for the RK11-C backplane is as follows (* = Connector):
| Slot | A | B | C | D |
|---|---|---|---|---|
| 1 | UNIBUS in | |||
| 2 | UNIBUS out | |||
| 3 | ||||
| 4 | ||||
| 5 | M105 | M784 | ||
| 6 | M782 | M79 | ||
| 7 | M795 | |||
| 8 | M784 | M784 | ||
| 9 | M623 | M307 | ||
| 10 | Disk 2* | M623 | M307 | |
| 11 | M623 | M307 | ||
| 12 | Disk 1* | M207 | M163 | |
| 13 | M798 | G736 | G740 | M405 |
| 14 | M149 | M149 | M116 | M161 |
| 15 | M149 | M149 | M304 | M119 |
| 16 | M149 | M149 | M113 | M113 |
| 17 | M239 | M238 | M216 | M141 |
| 18 | M239 | M214 | M115 | M115 |
| 19 | M214 | M214 | M121 | M112 |
| 20 | M208 | M208 | M111 | M111 |
| 21 | M203 | M203 | M112 | M112 |
| 22 | M149 | M149 | M205 | M117 |
| 23 | M149 | M149 | M203 | M203 |
| 24 | M121 | M002 | M116 | M115 |
| 25 | M216 | M797 | M611 | M617 |
| 26 | M141 | M119 | M113 | M304 |
| 27 | M304 | M112 | M112 | M113 |
| 28 | M236 | M121 | M216 | M216 |
| 29 | M205 | M117 | M117 | |
| 30 | W130* | M113 | M113 | |
| 31 | 6775* | M113 | M205 | |
| 32 | 6775* | M116 | M216 | |
W130 = Cable to ??
6775 = Cable to indicator panel
