RP11 disk controller
From Computer History Wiki
The RP11 disk controller for the UNIBUS is for the earlier RP multi-platter moving-head magnetic disk drives (RP02-RP03). (The later RP04 and RP06 drives are un-related - they include integral controllers, and connect to the MASSBUS.)
The only version of the RP11 is the RP11-C. Like many of the earlier large peripheral controllers for the PDP-11, the RP11-C 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 was wired for connection to a standard DEC indictor panel, which came standard with an RP11-C, mounted in the top of the rack the RP11-C backplane was mounted in.
Device registers
| Register | Abbreviation | Address |
|---|---|---|
| Device Status Register | RPDS | 776710 |
| Error Register | RPER | 776712 |
| Control Status Register | RPCS | 776714 |
| Word Count Register | RPWC | 776716 |
| Bus Address Register | RPBA | 776720 |
| Cylinder Address Register | RPCA | 776722 |
| Disk Address Register | RPDA | 776724 |
| Maintenance 1 Register | RPM1 | 776726 |
| Maintenance 2 Register | RPM2 | 776730 |
| Maintenance 3 Register | RPM3 | 776732 |
| Selected Unit Cylinder Address | SUCA | 776734 |
| Silo Memory | SILO | 776736 |
