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5. PortLink 2 parallel cable to connect Atari Portfolio to Atari ST, TT, Falcon [source: Lars-Erik]:
Portfolio Atari ST
CANON 25 f <-> CANON 25 f
pin 2 (Data) pin 2
pin 3 (Clock) pin 3
pin 12 (Clock) pin 8
pin 13 (Data) pin 9
pin 18 (GND) pin 18
pin 18 - connected via LED to pin 12 (+)