Atari PC Owner's Manual page 70

Printer
1 - OUT Strobe
2 - OUT Data O
3 - OUT Data 1
4 - OUT Data 2
5 - OUT Data 3
6 - OUT Data 4
7 - OUT Data 5
8 - OUT Data 6
9 - OUT Data 7
10 - IN Ack
11 - IN Busy
12 - IN Paper Error
13 - IN Select
14 - OUT Auto Feed
15 - IN Error
16 - OUT Initialize Printer
17 - OUT Select Input
18-25 - Ground
Floppy Disk Drive
1 - IN Read Data
2 - OUT Side Select
3 - Ground
4
- IN Index
5 - OUT Drive Select 1
6 - OUT Drive Select 2
7 - Ground
8 - OUT Motor On
9 - OUT Direction
10 - OUT Step
11 - OUT Write Data
12 - OUT Write Gate
13 - IN Track O Detect
14 - IN Write Protect
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