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ST412 Interface (MFM and RLL) Cable Diagram

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ST412 Interface (MFM and RLL) ST-506 was predecessor without buffered seek
2 Cables: 1 each 34-pin Command Cable and 1 each 20-pin Data Cable

J1 (34-pin Command) Host/Drive Pin Assignments

Ground RTN Pin	Signal Pin	Signal Name
1	2	-HEAD SELECT 2 (3)
3	4	-HEAD SELECT 2 (2)
5	6	-WRITE GATE
7	8 (Status Enables with Drive Select)	-SEEK COMPLETE
9	10 (Status Enables with Drive Select)	-TRACK 0
11	12 (Status Enables with Drive Select)	-WRITE FAULT
13	14	-HEAD SELECT 2 (0)
15	16	-RESERVED
17	18	-HEAD SELECT 2 (1)
19	20 (Status Enables with Drive Select)	-INDEX
21	22 (Status Enables with Drive Select)	-READY
23	24	-STEP
25 (29) TWISTED CABLE IN PARENTHESES	26 (28)	-DRIVE SELECT 1 (2)
27 (27)	28 (26)	-DRIVE SELECT 2 (1)
29 (25)	30	-DRIVE SELECT 3
31	32	-DRIVE SELECT 4
33	34	-DIRECTION IN

J2 (20-pin Data) Host/Drive Pin Assignments