Path: utzoo!utgpu!watmath!watdragon!rose!wacfeick
From: wacfeick@rose.waterloo.edu (Wayne Feick)
Newsgroups: comp.sys.amiga
Subject: Re: Need  hardcard for A500 that I can move to an A2000!
Message-ID: <13280@watdragon.waterloo.edu>
Date: 13 Apr 89 05:25:20 GMT
References: <12918@louie.udel.EDU>
Sender: daemon@watdragon.waterloo.edu
Reply-To: wacfeick@rose.waterloo.edu (Wayne Feick)
Organization: U. of Waterloo, Ontario
Lines: 28

You may want to try what I have on my A500.  If you get a 2090A, the
signals it requires are all available on the A500 expansion connector.
What you do is wire an 86 pin edge connector to a 100 pin edge
connector and add some power since there is not enough available from
the A500's power supply.  You'll need a new power supply to drive the
hard disk and the 2090A but you'll have to tie it's ground to the
ground on the 86 pin edge connector.  I've been running my hard disk
like this for around 5 months now without any problems.  I also got a
new ROM for my machine so that I could autoboot of the hard disk.  I
can give you a list of the appropriate connections between the two
edge connectors if you don't have the "A500/A2000 Technical Reference
Manual" or something else which gives you the pin outs.  Just examine
the 2090A to figure out which signals it requires.  The signals run
straight through except for /RST which goes from pin 53 on the 86 pin
connector to pin 94 on the 100 pin connector.
  
The connectors cost me around $15 and the power supply cost $75
(Canadian dollars, eh!)  One of these days I'll even get around to
putting the thing in a box.

If and when you get an A2000, you can just pick up your 2090A and your
hard disk and drop them into the new machine.

DISCLAIMER:  If you try this and blow up your machine, don't come crying
to me.  It works for me and it will probably work for you if you do it
right.

Wayne.