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
|
777400: Drive Status Register (RKDS)
| Drive Ident. |
DPL |
HDEN |
DRU |
SIN |
SOK |
DRY |
ARDY |
WPS |
SC=CA |
Sector Counter
|
| 15 14 13 |
12 |
11 |
10 |
09 |
08 |
07 |
06 |
05 |
04 |
03 02 01 00
|
777402: Error Register (RKER)
777404: Control Status Register (RKCS)
777406: Word Count Register (RKWC)
777410: Current Bus Address Register (RKBA)
777412: Disk Address Register (RKDA)
777414: Maintenance Register (RKMR)
777416: Data Buffer Register (RKDB)
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
This bootstrap will boot from any disk in a daisy-chained multi-drive configuration. Memory location octal 1006 contains the unit number, as follows:
| Value |
Unit
|
| 020000 |
Unit 1
|
| 040000 |
Unit 2
|
| 060000 |
Unit 3
|
| 100000 |
Unit 4
|
| 120000 |
Unit 5
|
| 140000 |
Unit 6
|
| 160000 |
Unit 7
|
| Address |
Data |
Mnemonic |
Description
|
| 1000 |
012700 |
MOV #177406, R0 |
Store the address of the Word Count register in r0
|
| 1002 |
177406 |
(constant) |
(Which is 177406)
|
| 1004 |
012760 |
MOV xxxxxx, 000004(R0) |
Store the disk ID number in the Disk Address register
|
| 1006 |
xxxxxx |
(disk ID number) |
The disk number goes here.
|
| 1010 |
000004 |
(index) |
|
| 1012 |
012700 |
MOV #177406, R0 |
Store the addresss of the Word Count register in r0
|
| 1014 |
177406 |
(constant) |
(Which is 177406)
|
| 1016 |
012710 |
MOV #177400, (R0) |
Store 177400 into the Word Count register,
|
| 1020 |
177400 |
(constant) |
meaning that octal 400 words are to be read.
|
| 1022 |
012740 |
MOV #000005, -(R0) |
Store 5 into the Control Status register
|
| 1024 |
000005 |
(constant) |
selecting the function "read" with 4, and "go" with 1
|
| 1026 |
105710 |
TSTB (R0) |
Test the Control Status Register (upper) byte
|
| 1030 |
100376 |
BPL *-1 |
Repeat if it's positive, that is Control Ready is cleared
|
| 1032 |
005007 |
CLR PC |
If not, clear the Program Counter (essentially, jump to 0)
|
Documentation
RK11-C manual, 1971
RK11-C schematics, February 1971
EK-RK11D-MM-002, RK11-D Maintenance Manual
