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.
If you know description of Do-It-Yourself device made using this pinout, share the link with us.
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


Is this document correct or incorrect?.
There are 1 reports in our database: 1 positive and 0 negative.
20 pin Apple HDI-20 connector layout
20 pin Apple HDI-20 connector
at the Apple computer, looking into cable-side connector
Source(s) of this and additional information: Apple "Ports and Pinouts", from Hardware Book
This page contain parts under Copyright © 2000-2015 by team.
No portion of this webpage may be reproduced in any form without providing visible HTML link to . Webmaster permission required in any other cases.
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.