Appendix A. Connector Pin Assignments
Diskette Drive Connector
Figure 30. IDE Connector Pin Assignments
Pin
Signal
I/O
Pin
Signal
I/O
1
RESET
O
21
NC
NA
2
Ground
NA
22
Ground
NA
3
Data bus bit 7
I/O
23
I/O write
O
4
Data bus bit 8
I/O
24
NC
NA
5
Data bus bit 6
I/O
25
I/O read
O
6
Data bus bit 9
I/O
26
Ground
NA
7
Data bus bit 5
I/O
27
I/O channel ready
I
8
Data bus bit 10
I/O
28
ALE
O
9
Data bus bit 4
I/O
29
NC
NA
10
Data bus bit 11
I/O
30
Ground
NA
11
Data bus bit 3
I/O
31
IRQ
I
12
Data bus bit 12
I/O
32
CS16#
I
13
Data bus bit 2
I/O
33
SA1
O
14
Data bus bit 13
I/O
34
PDIAG#
I
15
Data bus bit 1
I/O
35
SA0
O
16
Data bus bit 14
I/O
36
SA2
O
17
Data bus bit 0
I/O
37
CS0#
O
18
Data bus bit 15
I/O
38
CS1
O
19
Ground
NA
39
Active#
I
20
Key (Reserved)
NA
40
Ground
NA
Figure 31 (Page 1 of 2). Diskette Drive Connector Pin Assignments
Pin
Signal
I/O
Pin
Signal
I/O
1
Drive 2 installed #
I
2
High density select
O
3
Not connected
NA
4
Not connected
NA
5
Ground
NA
6
Data rate 0
NA
7
Ground
NA
8
Index#
I
9
Reserved
NA
10
Motor enable 0#
O
11
Ground
NA
12
Drive select 1#
O
13
Ground
NA
14
Drive select 0#
O
15
Ground
NA
16
Motor enable 1#
O
17
MSEN1
I
18
Direction in#
O
19
Ground
NA
20
Step#
O
21
Ground
NA
22
Write data#
O
23
Ground
NA
24
Write enable#
O
25
Ground
NA
26
Track0#
I
27
MSEN0
I
28
Write protect#
I
29
Ground
NA
30
Read data#
I
31
Ground
NA
32
Head 1 select#
O
36
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