IBM 4840-563 System Reference Manual page 52

Microphone connector
Pin Signal
Input
Tip
+5 V
Ring
Ground
Base
Headphone Connector
Pin Signal
Tip
Left channel audio
Ring
Right channel audio
Base
Ground
Parallel Connector
Pin Signal
1 STROBE#
2 Data bit 0
3 Data bit 1
4 Data bit 2
5 Data bit 3
6 Data bit 4
7 Data bit 5
8 Data bit 6
9 Data bit 7
10 ACK#
11 Busy
12 PE
13 SLCT
External Diskette Drive Connector
SurePOS 500 Model XX3 Technical Reference, v 1.3
I/O Pin
I/O 14
I/O 15
I/O 16
I/O 17
I/O 18
I/O 19
I/O 20
I/O 21
I/O 22
I 23
I 24
I 25
81
Signal
ATUO FC XT#
Error#
INIT#
SLCT IN#
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
I/O
O
I
O
O
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