Pinouts of Connectors

Apple Macintosh External Drive connector pinout

layout
schematic diagram
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This connector is present on the Macintosh 128K, 512K,512K enhanced, Plus, SE, SE/30, Classic, Classic II/Performa 200, Portable, IIcx, IIci, IIsi, and IIvi/IIvx/Performa 600.

19 pin D-SUB FEMALE connector  at the computerA Macintosh 400K External Drive can be connected to the Macintosh 128K, 512K, 512K enhanced, Plus, SE, and Portable.
A Macintosh 800K External Drive or an Apple 3.5 Drive can be connected to the Macintosh 512K enhanced, Plus, SE, SE/ 30, Classic, Classic II/Performa 200, IIcx, IIci, IIsi, Portable, and IIvi/IIvx/Performa 600.
Ports and Pinouts External Floppy Drive Connector: DB-19 - 23 Connect an Apple SuperDrive to a Macintosh SE (FDHD upgrade), SE/30, Classic, Classic II, IIcx, IIci, IIsi, Portable, and IIvi/IIvx/Performa 600.
Connect a Hand Disk 20 to a Macintosh 512K, 512K enhanced, Plus, and SE.
Pin Name Dir Description
1 CGND --- Chassis ground
2 CGND --- Chassis ground
3 CGND --- Chassis ground
4 CGND --- Chassis ground
5 -12V --> -12 VDC
6 +5V --> +5 VDC
7 +12V --> +12 VDC
8 +12V --> +12 VDC
9 n/c - Not connected
10 PWM ? Regulates speed of the drive
11 CA0 ? Control line to send commands to the drive
12 CA1 ? Control line to send commands to the drive
13 CA2 ? Control line to send commands to the drive
14 LSTRB ? Control line to send commands to the drive
15 WrReq- ? Turns on the ability to write data to the drive
16 HdSel ? Control line to send commands to the drive
17 Enbl2- ? Enables the Rd line (else Rd is tristated)
18 Rd <-- Data actually read from the drive
19 Wr --> Data actually written to the drive

Note: Direction is Computer relative Diskdrive.

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19 pin D-SUB MALE connector  at the cable
Pinouts.ru > Pinouts of different diskdrives connectors >  Pinout of Apple Macintosh External Drive connector and layout of 19 pin D-SUB FEMALE connector and 19 pin D-SUB MALE connector

Source(s): Apple Tech Info Library, Article ID: TECHINFO-0001424; Ben Harris
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