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HwB: Macintosh External Drive Connector

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Macintosh External Drive

NOT DRAWN YET (At the Computer)
NOT DRAWN YET (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: Email ">Ben Harris
Source: Apple Tech Info Library, Article ID: TECHINFO-0001424
Please send any comments to Joakim Цgren.

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