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20 pin Apple HDI-20 connector layout
20 pin Apple HDI-20 connector
at the Apple computer, looking into cable-side connector
This connector is present on the Macintosh Duo MiniDock and PowerBook Duo Floppy adapter. An HDI-20 1.4 MB drive can be connected to this port.
Pin Name Description
1 GND Signal Ground
2 GND Signal Ground
3 GND Signal Ground
4 GND Signal Ground
5 NC No connection
6 +5V +5 volts DC
7 +5V +5 volts DC
8 +5V +5 volts DC
9 +5V +5 volts DC
10 NC No connection
11 PH0 Phase 0: state control line
12 PH1 Phase 1: state control line
13 PH2 Phase 2: state control line
14 PH3 Phase 3: register write strobe
15 WREQ Write request
16 HDSEL Head select
17 ENBL2 External drive select
18 RD Read data
19 WR Write data
20 NC No connection
 

14

Pinout status: +1 -0
According to 1 reports in our database (1 positive and 0 negative) the Apple Macintosh External Floppy disk drive pinout should be correct.

Is this pinout
NO DIY devices
Source(s) of this and additional information: Apple "Ports and Pinouts", from Hardware Book
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