Connector - Apple Macintosh Internal Floppy disk drive20 PIN UNKNOWN CONNECTOR| Pin | Name | Description |
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| 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 | +5V | +5 volts | | 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 |
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