Difference between revisions of "RK11 disk controller"

Revision as of 03:24, 17 May 2007

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

Physical implementation

Todo.

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)

DRE	OVR	WLO	SKE	PGE	NXM	DLT	RTE	NXD	NXC	NXS				CSE	WCE
15	14	13	12	11	10	09	08	07	06	05	04 03 02			01	00

777404: Control Status Register (RKCS)

ERR	H.E.	SCP	M	IBA	FMT	R/WA	SSE	RDY	IDE	EX. MEM		FUNCTION			GO
15	14	13	12	11	10	09	08	07	06	05 04		03 02 01			00

777406: Word Count Register (RKWC)

WC15 <---> WC00
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

777410: Current Bus Address Register (RKBA)

BA15 <---> BA00
15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00

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

@@ Line 58: / Line 58: @@
 ===777410: Current Bus Address Register (RKBA)===
+{| border=1 style="text-align: center;"
+| colspan=16 | BA15 <---> BA00
+|-
+| 15 || 14 || 13 || 12 || 11 || 10 || 09 || 08 || 07 || 06 || 05 || 04 || 03 || 02 || 01 || 00
+|}
 ===777412: Disk Address Register (RKDA)===
 ===777414: Maintenance Register (RKMR)===