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From: terry@helios.ucsc.edu (Terry Ricketts)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Live 500 on a 1000?
Keywords: Live
Message-ID: <6694@darkstar.ucsc.edu>
Date: 7 Sep 90 23:03:37 GMT
References: <13352@hydra.gatech.EDU> <105886@convex.convex.com>
Sender: usenet@darkstar.ucsc.edu
Reply-To: terry@helios.ucsc.edu (Terry Ricketts)
Organization: UCO/Lick Observatory, Santa Cruz
Lines: 42

In article <105886@convex.convex.com> swarren@convex.com (Steve Warren) writes:

>The only difference is that the slot on the 500 is on the left side of the
>computer instead of the right side.  So that means when you move the
>peripheral to the other side of the 1000, with the connector still pointing
>toward the computer, the front of the peripheral box will be facing the wall
>instead of facing forward.  Any power cables or other cabling that comes out
>the back of the box will be facing forward.

>In addition, on the 500 the expansion slot is at the bottom of the case, while
>the 1000 motherboard sits elevated on stilts above the table (to leave room
>for the keyboard garage).

>So the peripheral case will need "shims" (a book of appropriate width will
>probably do fine) under it to keep it from hanging awkwardly out of your
>slot.

>The signals available on the 1000 slot are the same signals available on the
>500 slot, including all voltage levels.
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

	This is not quite true. The A1000 has -5v available on the bus while
the A500 has -12v on that same pin. We have taken several Live units made for
the A1000 and modified a connector to allow them to plug into a A500. What is
needed is a short extender board to get the A500 bus a little further out. Then
you need to break the connection to pin 8 and insert a 7905 regulator between
the A500 and Live. This will change the -12v from the computer to the -5v
expected by Live.  If you take any peripheral made for the A1000 & try to plug
it into a A500 you run the risk of blowing it up. If the peripheral is using
the -5V from the A1000 you MUST change it before plugging it into the A500.
Live is one of the peripherals that uses this voltage!!!


     In case anyone is interested we have also modified a number of Live units
to replace the 4 bit ADC with a 6 bit ADC.



| 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 	|