info-mac@utcsrgv.UUCP (info-mac) (04/26/84)
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...
info-mac@utcsrgv.UUCP (info-mac) (04/26/84)
Date: Wed, 25 Apr 84 13:21 PST From: Bill Croft <uw-beaver!croft@Safe> Subject: Re: wiring up an external disk drive To: info-mac@sumex Cc: croft@Safe Since we are still waiting on the 19 pin D connectors from AMP, Nick Veizades, our hardware wizard, figured out this hack: Take a 20 cond ribbon cable and put a Berg on each end and another Berg about 6 inches from one end. Use the close pair to daisy chain from the Mac CPU board to the internal drive and out a slot in the back (over the top of the 19 pin D works fine). Since wire # 14 is the enable line (to the internal drive), cut this wire in the ribbon cable. Solder a pin on the other side of wire # 14 and stick it in pin # 17 of the D connector (external drive enable). The dual drive Mac works great. A disk-disk copy takes about a minute with no disk swaps. Programs using the "standard file" file opening dialog (such as MacPaint) have a "drive" box that toggles the current drive. In the finder, new disks just appear on the desktop when you insert them.
info-mac@utcsrgv.UUCP (info-mac) (04/27/84)
Date: Thu, 26 Apr 84 14:37:54 EST From: Bob Rees <uw-beaver!rrees@BBN-UNIX> Subject: Re: wiring up an external disk drive In-Reply-To: Your message of Wed, 25 Apr 84 10:43 PST To: Bill Croft <croft@Safe> Cc: info-mac@sumex I have never seen one of the Mac external disk drives (and neither has my local Apple dealer!). Does it get all its power from the Mac via the 19-pin connector, or does it contain its own power supply & AC line cord?
info-mac@utcsrgv.UUCP (info-mac) (04/27/84)
Date: Thu 26 Apr 84 20:18:20-EST From: Michael Rubin <uw-beaver!RUBIN@COLUMBIA-20.ARPA> Subject: Re: wiring up an external disk drive To: croft%SUMEX-VAX@SU-SCORE.ARPA Cc: info-mac@SUMEX-AIM.ARPA, croft%SUMEX-VAX@SU-SCORE.ARPA In-Reply-To: Message from "Bill Croft <croft@Safe>" of Wed 25 Apr 84 22:04:51-EST Another way to fake the 19-pin D connector is with an ordinary 25-pin connector and a hacksaw... just be careful about alignment when you plug it in. The same hack [pun intended] also applies to the 9-pin serial port connector. -------