RK11 disk controller

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The RK11 is the UNIBUS controller for the RK05 moving-head magnetic disk drive.

Device registers

Register Abbreviation Address
Drive Status Register RKDS 777400
Error Register RKER 777402
Control Status Register RKCS 777404
Word Count Register RKWC 777406
Current Bus Address Register RKBA 777410
Disk Address Register RKDA 777412
Maintenance Register RKMR 777414
Data Buffer Register RKDB 777416


PDP-11 bootstraps

Disk 0

I know the octal data is correct, but I'm not sure about the mnemonics and the description.

Address Data Mnemonic Description
1000 012700 MOV #177406,R0 Move the top of the address of the controller into r0
1002 177406 (constant)
1004 012710 MOV #177400,(R0) Move 177400 into 177406
1006 177400 (constant)
1010 012740 MOV #5,-(r0) Move 5 into 177404
1012 000005 (constant)
1014 105710 TSTB (R0) Test byte at 177404
1016 100376 BPL 1014 Jump backward if positive
1020 005007 CLR PC Jump to zero

Disk n

Address Data Mnemonic Description
1000 012700 MOV #177406, R0
1002 177406 (constant)
1004 012760 MOV xxxxxx, 000004(R0)
1006 xxxxxx (disk ID number)
1010 000004 (index)
1012 012700 MOV #177406, R0
1014 177406 (constant)
1016 012710 MOV #177400, (R0)
1020 177400 (constant)
1022 012740 MOV #000005, -(R0)
1024 000005 (constant)
1026 105710 TSTB (R0)
1030 100376 BPL *-1
1032 005007 CLR PC


Documentation

RK11-C manual, 1971

RK11-C schematics, February 1971

EK-RK11D-MM-002, RK11-D Maintenance Manual