Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!usc!ucsd!ucbvax!agate!darkstar!helios!terry
From: terry@helios.ucsc.edu (Terry Ricketts)
Newsgroups: comp.sys.amiga
Subject: Re: A Question, a problem and an offer. (correction)
Message-ID: <8304@darkstar.ucsc.edu>
Date: 30 Oct 90 15:54:55 GMT
References: <5348@crash.cts.com>
Sender: usenet@darkstar.ucsc.edu
Reply-To: terry@helios.ucsc.edu (Terry Ricketts)
Organization: UCO/Lick Observatory, Santa Cruz
Lines: 32

In article <5348@crash.cts.com> orb@pnet01.cts.com (Randolph Turner) writes:

>  Ooops!  A correction to my previous post.  After re-reading the article
> in Amiga World regarding an A500's buss port equivelence to the A1000's,
> and receiving a piece of mail to the same respect, I would like to make
> it clear that the A1000's buss expansion port is NOT upside-down, but
> rather back-to-front.  Thus, A500 peripherals would be plugged in facing
> the back of the A1000, and NOT upside-down.  The person that sent me
> E-mail about my mistaken interpretation is quite correct in stating that
> plugging anything in upside-down will most likely kill something
> valuable.


   WARNING...WARNING...WARNING...Dangerous voltage present...

   Anyone who tries this needs to be warned that pin 8 of the expansion bus
contains -5v on the A1000 and -12v on the A500. Do NOT plug a peripheral for
the A1000 into the A500 without checking that 1) that voltage is not connected
in the peripheral or 2) installing a -5v regulator on the peripheral on pin
8. You could do nasty things to your peripheral or computer or both. 
   If you want to use a peripheral from the A500 on a A1000 be warned that it
may not work if it needs -12v. Some well designed units will work at eithor
voltage. Others dont need the voltage & thus will work. You need to check
first.




| Terry Ricketts			|  Internet: terry@helios.ucsc.edu
| Senior Electronics Engineer		|  	     loel@helios.ucsc.edu
| Lick Observatory Electronics Lab	|  Phone:    408-459-2110
| University of Calif, Santa Cruz 	|