Pin11 (Busy) Data/Count-in ;data to computer (some variants seem to have separate pins: Busy=Data-in and Ack=Count-in)
Pin.. (GND) Ground ;ground
The parallel fischertechnik interface has a 20pin (or 10pin) cable(the 10pin cable was used in early commodore versions, the 20pin variant was invented to simplify printer-port connections, which have GND on each 2nd wire). The various supported computers have different pin-outs: 24pin Edge (C64/VIC20), 25pin DSUB (PC/Amiga/Atari), 34pin Edge (CPC464/CPC664), or 36pin Centronics (german CPC6128). To solve that, some cables have a N-pin connector on a 20-pin cable. Others have a 20-pin connector, with additional 20-pin to N-pin adaptor.
== Pictures ==