AT&T 3B2/300 Technical Reference Manual page 600

Appendix: CONNECTOR AND CABLING I N F O R M A T I O N - - - - - - - - - - - - - - - -
20-PIN HARD DISK CONTROL O CONNECTOR, JOB
PIN DESCRIPTION
1 DRIVE SELECTED (DSD[O])
2 GROUND
3
NOT USED
4
GROUND
5
GROUND
6
GROUND
7
CONNECTOR COMMON (JlP16)
8
GROUND
9 NOT USED
10
GROUND
11 GROUND
12 GROUND
13
+MFM WRITE DATA (MFMOP[O])
14 -MFM WRITE DATA (MFMON[O])
15 GROUND
16 GROUND
17 +MFM READ DATA (MFMIP[O])
18 -MFM READ DATA (MFMIN[O])
19 GROUND
20 NOT USED
LEGEND:
MFM
NC
Modified Frequency Modulation
No Connection
B-18 TECHNICAL REFERENCE MANUAL
FUNCTION
INPUT
GROUND
NC
GROUND
GROUND
GROUND
GROUND
GROUND
NC
GROUND
GROUND
GROUND
OUTPUT
OUTPUT
GROUND
GROUND
INPUT
INPUT
GROUND
NC