The RP11 disk controller for the UNIBUS is for the earlier RP removable pack multi-platter moving-head magnetic disk drives (RP02-RP03). (The later RP04-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 device controllers for the PDP-11, the RP11-C was a group of large custom wire-wrapped backplanes which bolted into the front of a 19 inch rack, such as an H960; into it plugged about 200 small M-Series FLIP CHIPs.
The backplane was wired for connection to a standard DEC indicator 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
|
Note that the RP11 responds to addresses from 0776700 up to 0776736, but there are no registers in the range 0776700 to 0776706.
776710: Device Status Register (RPDS)
| SU RDY |
SU OL |
SU RP03 |
HNF |
SU SI |
SU SU |
SU FU |
SU WP |
ATTN
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776712: Error Register (RPER)
| WPV |
FUV |
NXC |
NXT |
NXS |
PROG |
FMTE |
MODE |
LPE |
WPE |
CSME |
TIMEE |
WCE |
NXME |
EOP |
DSK ERR
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776714: Control Status Register (RPCS)
| ERR |
HE |
ATE |
MODE |
HDR |
DRV SEL |
RDY |
IDE |
MEM EX |
COM |
GO
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776716: Word Count Register (RPWC)
| WC15 <---> WC00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776720: Bus Address Register (RPBA)
| BA15 <---> BA00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776722: Cylinder Address Register (RPCA)
| |
CYLINDER
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776724: Disk Address Register (RPDA)
| |
TRACK |
CURRENT SECTOR |
SECTOR
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776726: Maintenance Register 1 (RPM1)
| Unused |
SILO OUT RDY |
SILO IN RDY |
CTL |
SET HD |
SET CYL |
BUS OUT 07 <---> 00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776730: Maintenance Register 2 (RPM2)
| MAINT CYL ADDR 07 <---> 00 |
MAINT ATTN 07 <---> 00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776732: Maintenance Register 3 (RPM3)
| MAINT RO |
MAINT RDY |
MAINT ONL |
MAINT IDX |
MAINT UNS |
MAINT INC |
MAINT EOC |
MAINT SEC |
Unused |
MAINT CLK
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776734: Selected Unit Cylinder Address (SUCA)
| Unused |
CYLINDER 07 <---> 00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
776736: Silo Memory (SILO)
| SM15 <---> SM00
|
| 15
|
14
|
13
|
12
|
11
|
10
|
09
|
08
|
07
|
06
|
05
|
04
|
03
|
02
|
01
|
00
|
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