IBM MICRO TOWER 2169 - Manual (Page 139)

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7 Data Bit 5 I/O 20 Ground Power
8 Data Bit 6 I/O 21 Ground Power
9 Data Bit 7 I/O 22 Ground Power
10 Acknowledge I 23 Ground Power
11 Busy I 24 Ground Power
12 Paper Empty I 25 Ground Power
13 Select O
Mouse Port Signals
Pin Signal Name I/O Pin Signal Name I/O
1 Mouse Data I/O 4 +5 V dc Power
2 No Connection N/A 5 Mouse Clock I/O
3 Ground Power 6 No Connection N/A
Keyboard Port Signals
Pin Signal Name I/O Pin Signal Name I/O
1 Keyboard Data I/O 4 +5 V dc Power
2 Mouse Data N/A 5 Keyboard Clock I/O
3 Ground Power 6 Mouse Clock N/A