Somebody already beat me to it, but what you're probably looking at is a plug and a socket, if you plug them together you'll see they all go straight through
The standard Parallel printer port interface is
DB25 Centronics (57-30360 plug)
1 1 Strobe
2-9 2-9 Data0 -> Data7
10 10 ACK
11 11 Busy
12 12 Paper Out
13 13 Select In
14 14 Autofeed
15 32 Error
16 31 Reset
17 36 Select
18-25 19-26 (Grounds)
(oh dear god, I just did the pin-pin mapping off the top of my head - some useless knowledge buried in there. I double checked it, but it was right)