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Macintosh External Drive

 (at the Computer)
 (at the Diskdrive)

19 PIN D-SUB FEMALE at the Computer.
19 PIN D-SUB MALE at the Diskdrive.

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 tri-stated)
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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