HwB: Macintosh External Drive Connector

Macintosh External Drive

NOT DRAWN YET (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 tristated)
18	Rd		Data actually read from the drive
19	Wr		Data actually written to the drive

Note: Direction is Computer relative Diskdrive.

Contributor: ">Ben Harris

Source: Apple Tech Info Library, Article ID: TECHINFO-0001424

Please send any comments to Joakim Цgren.