This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
The cable you need is the very common "Centronics cable". It is sold by
several Apple II vendors. The pin-out is shown below:
Grappler+ Pin Assignments
~~~~~~~~~~~~~~~~~~~~~~~~~
STB 1
D0 3
D1 5
D2 7
D3 9
D4 11
D5 13
D6 15
D7 17
ACK 19
BUSY 21
P.E. 23
SLCT 25
N/C -
GND all others
By: Mitchell Spector
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