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From: newton@cit-vax.UUCP
Newsgroups: comp.sys.mac
Subject: What's really in a Mac SCSI....
Message-ID: <4008@cit-vax.Caltech.Edu>
Date: Fri, 18-Sep-87 02:46:57 EDT
Article-I.D.: cit-vax.4008
Posted: Fri Sep 18 02:46:57 1987
Date-Received: Sat, 19-Sep-87 16:01:33 EDT
Reply-To: newton@cit-vax.UUCP (Mike Newton)
Distribution: world
Organization: California Institute of Technology
Lines: 46



First I tear apart the mac C compilers, now a disk drive.  Hm... I guess
I'm kind of destructive....

Here are some comments on disk drives for the Mac, the EasyDrive 30Meg
in particular.  (I posted the disktimer II results a while ago, though
I'm happy to repost again if necessary..)

Anyway:

Assembly:  The outer case held on by 4 screws on the base.  Alignment was
not to great, so re-assembly required a little pulling.

Insides:  A 45 What ("110 V 1A    220V .5A  47-63Hz,  115VA  45 W") non-
switching (I believe -- lots of fair sized capacitors) power supply.  This
feeds power directly to an Adaptec 4070 (RLL capable) drive and the drive
itself.

The Adaptec board is configued w/ jumper (J4) going from G to H, which I
assumed selected the SCSI address.  Both resistor packs were still on the
board.

The amusing part was the disk drive itself -- INSIDE the outer box  was a
PC drive -- complete with the arms those things usually slide in and out on,
and the typical PC LED for the front panel.  I could not get the frame of
the inner box off (too tightly screwed on), but it had the following markings:

	FK305-39R

Anyway, it seems like software is really the problem for a SCSI drive.  For
a drive, just buy a PC drive, an Adaptec board ($150 ?) and a power supply.
Software can be the macTutor articles on a SCSI formatter, though I have not
tried these.

- mike

ps: If my drive ever croaks, I guess I'll go get a 40M pc drive and just replace
the 20 Meg in there now ( With RLL coding 40 -> 60, 20 -> 30). I can buy the
PC drive for many $$$ less than a Mac one.
-- 
newton@csvax.caltech.edu	{ucbvax!cithep,amdahl}!cit-vax!newton
Caltech 256-80			818-356-6771 (afternoons,nights)
Pasadena CA 91125		Beach Bums Anonymous, Pasadena President

		I'm never biased...