Planar Diskette Interface

This connector is found on the IBM PS/2 95A, Lacuna, and 9585 K-N models. All floppy drives used must support media sense.

Pinout

44 PIN UNKNOWN CONNECTOR

Pin Signal                         Pin Signal
 1 -2nd Drive installed            2 Data rate Select 1
 3 + 5VDC                          4 Drive Type ID1/Drive status 1
 5 Ground                          6 + 12VDC
 7 Ground                          8 -Index
 9 Drive Type ID0/Drive status 0  10 Reserved
11 Ground                         12 -Drive Select
13 Ground                         14 -Security Command 0
15 Ground                         16 -Motor Enable 0
17 Media Type ID1/Drive status 3  18 -Direction In
19 Ground                         20 -Step
21 Ground                         22 -Write Data
23 Ground                         24 -Write Enable
25 Ground                         26 -Track 0
27 Media Type ID0/Drive status 2  28 -Write Protect
29 Ground                         30 -Read Data
31 Ground                         32 -Head 1 Select
33 Data rate Select 0             34 -Diskette Change
35 Drive Select 1                 36 Ground
37 -Security Command 1            38 Ground
39 -Motor Enable 1                40 -Drive Select 2
41 Ground                         42 -Security Command 2
43 Ground                         44 -Motor Enable 2 

Sources

• Floppy Drive Pinouts by Louis F. Ohland III
• Information extracted from IBM PS/2 Servers 95 and 95A Technical Reference, Type 9595, page 2-5, First Ed., Sept 1993. P/N 71G3726