HP Compaq Presario,Presario 1500 Maintenance And Service Manual page 191

Connector Pin Assignments
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
*Signal is active low.
A–4
Table A-6
Parallel
Pin Signal
10 Acknowledge*
11 Busy
12 Paper out
13 Select
14 Auto line feed*
15 Error*
16 Initialize printer*
17 Select in*
18-25 Signal ground
Maintenance and Service Guide