Parallel Port - Pinouts

Pinouts

Pinouts for parallel port connectors are:

Pin No (DB25) Pin No (36 pin) Signal name Direction Register - bit Inverted
1 1 Strobe In/Out Control-0 Yes
2 2 Data0 Out Data-0 No
3 3 Data1 Out Data-1 No
4 4 Data2 Out Data-2 No
5 5 Data3 Out Data-3 No
6 6 Data4 Out Data-4 No
7 7 Data5 Out Data-5 No
8 8 Data6 Out Data-6 No
9 9 Data7 Out Data-7 No
10 10 Ack In Status-6 No
11 11 Busy In Status-7 Yes
12 12 Paper-Out In Status-5 No
13 13 Select In Status-4 No
14 14 Linefeed In/Out Control-1 Yes
15 32 Error In Status-3 No
16 31 Reset In/Out Control-2 No
17 36 Select-Printer In/Out Control-3 Yes
18-25 19-30,33,17,16 Ground - - -

Inverted lines are true on logic low. If they are not inverted, then logic high is true.

Pin 25 on the DB25 connector might not be connected to ground on modern computers.

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