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1 ------------------------------- > STROBE *
2 ------------------------------- > DATA 0
3 ------------------------------- > DATA 1
4 ------------------------------- > DATA 2
5 ------------------------------- > DATA 3
6 ------------------------------- > DATA 4
7 ------------------------------- > DATA 5
8 ------------------------------- > DATA 6
9 ------------------------------- > DATA 7
10< ------------------------------ ACK *
11< ------------------------------ BUSY
12< ------------------------------ PAPER END
13 ------------------------------ SLCT (select)
14 ------------------------------ >AUTOFEED *
15< ------------------------------ ERROR *
16 --------------------------->INITIALIZE PRINTER *
17 ------------------------------- SLCTIN (select in)
18 thru 25 ----------------------- GND

whats the corresponding pinout for a 26 pins parallel internal header?

Don't know of any newer mother boards with an internal header. I think you would have to look at an older AT style motherboard to get that info.

And there might be some differences in the internal header pinouts so I think it would be safest if you can get the pinout from your cards documentation.

Isn't there any pinout included with the card ? Or then the cable from which you could trace it ?