this file contains info to connect lines between pc and apple 1.apple game i/o pins to keyboard side as an apple user, you'll see ^^^^^^^^^^^ +---+ +---+ +----------+ +5 |1 +-+ 16| none none | 9 8| GND PB0 |2 15| AN0 GC1 |10 7| GC2 PB1 |3 14| AN1 GC3 |11 6| GC0 PB2 |4 13| AN2 AN3 |12 5| strobe strobe |5 12| AN3 AN2 |13 4| PB2 GC0 |6 11| GC3 AN1 |14 3| PB1 GC2 |7 10| GC1 AN0 |15 2| PB0 GND |8 9 | none none |16 +--+ 1| +5 +---------+ +---+ +---+ since keyboard is in back board side this direction 2.pc parallel port 25-pin please buy a 25-pin "jump wire connector" (for rs-232 is ok , they both are 25-pin) |\ | \ 1 | \ 2 | \ 3 | | 14 4 | | 15 5 | | 16 6 | | 17 7 | | . 8 | | . 9 | | . 10 | | . 11 | | 25 12 | / 13 | / | / |/ 3.line connection: 9 lines total apple --- pc GND pin 25 as GND PB0 pin 2 as apple side handshake in (apple -> pc);data bit 0 PB1 pin 3 apple input data bit 1 PB2 pin 4 apple input data bit 2 GC0 pin 5 as apple side handshake in (pc -> apple) AN0 pin 15 apple output data bit 0 AN1 pin 13 apple output data bit 1 AN2 pin 12 apple output data bit 2 AN3 pin 10 apple side handshake out