AT&T 3B2/300 Technical Reference Manual page 601

- - - - - - - - - - - - - - - - Appendix: CONNECTOR AND CABLING INFORMATION
20-PIN HARD DISK CONTROL 1 CONNECTOR, J09
PIN DESCRIPTION
1 DRIVE SELECTED (DSD(O])
2 GROUND
3 NOT USED
4
GROUND
5 GROUND
6 GROUND
7 CONNECTOR COMMON 01P16)
8 GROUND
9 NOT USED
10 GROUND
11 GROUND
12 GROUND
13 +MFM WRITE DATA (MFMOP[l])
14 -MFM WRITE DATA (MFMON[l])
15 GROUND
16 GROUND
17
+MFM READ DATA (MFMIP[l])
18 -MFM READ DATA (MFMIN[l])
19 GROUND
20 NOT USED
LEGEND:
MFM
NC
Modified Frequency Modulation
No Connection
FUNCTION
INPUT
GROUND
NC
GROUND
GROUND
GROUND
-
GROUND
NC
GROUND
GROUND
GROUND
OUTPUT
OUTPUT
GROUND
GROUND
INPUT
INPUT
GROUND
NC
CONNECTOR AND CABLING INFORMATION B-19