# Apple Macintosh Internal Floppy disk drive

20 PIN UNKNOWN CONNECTOR

Pin | Name | Description
--- | --- | ---
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

Contributor: Joakim Ögren

Source:
Apple Power Macintosh 5400 Developer Note

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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2000-07-07