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Floppy Drive Pinouts
40-Pin Card-Edge Interface
34-pin Header Interface Non-Media Sense
34-pin Header Interface, Media Sense
44-pin Planar Interface (95A, Lacuna,
85K/N)
Extracted from PS/2 3.5-inch Diskette Drives Technical Reference (S42G-2194-00),
2nd Ed., Oct 1992, pages 10-12.
NOTE: There are differences between
the 1990 Tech Ref and the '92 Tech Ref Signal names for the Enhanced 34-pin
interface. See the Notes below the table. I believe the additional definition
is related to the floppy controller used for the EE floppies.
Signals and voltages are transferred between the system board
and the diskette drives by a cable or printed circuit board. The printed-circuit
board provides a 2- by 20-pin card edge connector for each diskette drive,
with a locator key between pins 34 and 36. The cable interface provides
a 2 x 17-pin header connector to each diskette drive, with a locator key
below pin 17. ) The following figures show the signals and DC voltages
for each diskette drive connector type:
40-Pin Card-Edge
Interface
Pin Signal Pin Signal
1 Ground 2 -High
Density Select
3 Reserved 4 Reserved
5 Ground 6 Reserved
7 Ground 8 -Index
9 Ground 10 Reserved
11 Ground 12 -Drive Select
13 Ground 14 Reserved
15 Ground 16 -Motor Enable
17 Ground 16 -Direction In
19 Ground 20 -Step
21 Ground 22 -Write Data
23 Ground 24 -Write Enable
25 Ground 26 -Track 0
27 Ground 26 -Write Protect
29 Ground 30 -Read Data
31 Ground 32 -Head 1 Select
33 Ground 34 -Diskette Change
35 Ground 36 Ground
37 Ground 36 +5VDC
39 Ground 40 +12VDC
Figure 8. Signal Assignments For the 40-pin Card Edge Interface
34-pin Header Interface
Non-Media Sense
This connector is for drives and controllers that do not support
media sense.
Pin Signal Pin Signal
1 Ground 2 -High
Density Select
3 + 5VDC 4 Drive
Type ID 1
5 Ground 6 + 12VDC
7 Ground 8 -Index
9 Ground 10 Reserved
11 Ground 12 -Drive Select
13 Ground 14 Reserved
15 Ground 16 -Motor Enable
17 Ground 18 -Direction In
19 Ground 20 -Step
21 Ground 22 -Write Data
23 Ground 24 -Write Enable
25 Ground 26 -Track 0
27 Ground 28 -Write Protect
29 Ground 30 -Read Data
31 Ground 32 -Head 1 Select
33 Ground 34 -Diskette Change
Figure 9. Signal Assignments For the 34-pin Header Interface
34-pin Header Interface,
Media Sense
This connector is for drives and controllers that support media
sense.
Pin Signal
Pin Signal
1 Ground
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*
15 Ground
16 -Motor Enable
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
Figure 10. Signal Assignments For the Enhanced 34-pin Header
Interface
*
'90 ref has this Reserved
All blue text is not present in '90 Tech Ref
44-pin
Planar Diskette Interface
This puppy is found on the 95A, Lacuna, and 9585 K-N models. All floppy
drives used must support media sense.
Information extracted from IBM PS/2 Servers 95 and 95A Technical Reference,
Type 9595, page 2-5, First Ed., Sept 1993. P/N 71G3726
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
9595 Main
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