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128 IBM Desktop System HMM
Parallel Port Signals
Mouse Port Signals
Keyboard Port Signals
Pin
Signal
Name
I/O Pin
Signal
Name
I/O
1 Strobe O 14 Auto Feed N/A
2 Data Bit 0 I/O 15 Error I
3 Data Bit 1 I/O 16 Initialize O
4 Data Bit 2 I/O 17 Select (In) O
5 Data Bit 3 I/O 18 Ground P
6 Data Bit 4 I/O 19 Ground Power
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 0 -- -- --
Pin
Signal
Name
I/O Pin
Signal
Name
I/O
1Mouse
Data
I/O 4 +5 V dc Power
2No
Connection
-- 5 Mouse
Clock
I/O
3 Ground Power 6 No
Connection
--
Pin
Signal
Name
I/O Pin
Signal
Name
I/O
1 Data I/O 4 +5 V dc Power
2 No
Connection
5 Clock I/O
3 Ground Power 6 No
Connection
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