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Path: utzoo!utcsrgv!info-mac
From: info-mac@utcsrgv.UUCP (info-mac)
Newsgroups: ont.micro.mac
Subject: wiring up an external disk drive
Message-ID: <4046@utcsrgv.UUCP>
Date: Thu, 26-Apr-84 01:55:48 EST
Article-I.D.: utcsrgv.4046
Posted: Thu Apr 26 01:55:48 1984
Date-Received: Thu, 26-Apr-84 04:15:09 EST
Sender: peterr@utcsrgv.UUCP
Organization: CSRG, University of Toronto
Lines: 45

Date: Wed, 25 Apr 84 10:43 PST
From: Bill Croft <uw-beaver!croft@Safe>
Subject: wiring up an external disk drive
To: info-mac@sumex
Cc: croft@Safe

If you happen to have a spare SONY disk drive (like the one inside
your LISA) that you aren't using all the time, you can try hooking
it up as a 2nd drive on your Macintosh.  Here's the wiring diagram:

Mac, 19 pin D		Function	SONY drive, 20 pin
connector, J4				Berg conn, J5

	1		gnd		1
	11		phase 0		2
	2		gnd		3
	12		phase 1		4
	3		gnd		5
	13		phase 2		6
	4		gnd		7
	14		phase 3		8
	5		no wire		9
	15		wr req/		10
	6		+5V		11
	16		hd sel		12
	7		+12V		13
	17		enable/		14
	8		+12V		15
	18		rd mpx		16
	9		no wire		17
	19		wr data		18
	-		no wire		19
	10		pwm		20

We are having a hard time finding the 19 pin D connector; however the
part number for the female side in the Mac is AMP 745971-1, so AMP
should have a matching male connector.

Take care when aligning the Berg connector on the back of the SONY
drive.  Line up the arrows.  When looking at the back of the drive,
pin 1 is in the upper right corner.

Good luck, we'll let you know when the smoke clears...