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Connector pinout: Apple Floppy Apple Floppy Power Macintosh 7200, 7500, 8500, 9500 pin name direction description color 1 GND Ground 2 PH0 Phase 0: state control line 3 GND Ground 4 PH1 Phase 1: state control line 5 GND Ground 6 PH2 Phase 2: state control line 7 GND Ground 8 PH3 Phase 3: register write strobe 9 n.c. Not connected 10 /WRREQ Write data request 11 +5V +5 volts 12 SEL Head select 13 +12V +12 volts 14 /ENBL Drive enable 15 +12V +12 volts 16 RD Read data 17 +12V +12 volts 18 WR Write data 19 +12V +12 volts 20 n.c. Not connected