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ST-412 and ST-506

ST-412 Interface (MFM and RLL).
ST-506 was predecessor without buffered seek.
2 Cables: 34-pin Command Cable and 20-pin Data Cable.

Note: The 34-pin cable was connected to all the drives, but each (of upto four) drives had it's own 20-pin cable, I am quite sure, Jaap.

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

Ground return pin	Signal pin	Signal
1	2	-Head select 2**3
3	4	-Head select 2**2
5	6	-Write gate
7	8*	-Seek complete
9	10*	-Track 0
11	12*	-Write fault
13	14	-Head select 2**0
15	16	-Reserved
17	18	-Head select 2**1
19	20*	-Index
21	22*	-Ready
23	24	-Step
25 (29)**	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

Notes:

* Status enabled with drive select

** Twisted cable in parentheses

J2 (20-pin Data) Host/drive pin assignments

Ground return pin	Signal pin	Signal name
2	1	-Drive selected
4	3	Reserved
6	5	Reserved
8	7	Reserved
10	9	Reserved
12	11	Ground
	13	+MFM (RLL) WRITE DATA
	14	-MFM (RLL) Write data
16	15	Ground
	17	+MFM (RLL) Read data
	18	-MFM (RLL) Read data
20	19	Ground

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