Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Autoconfiging a Spirit Inboard-500
Message-ID: <11459@cbmvax.commodore.com>
Date: 9 May 90 09:20:55 GMT
References: <3005@ultb.isc.rit.edu>
Reply-To: grr@cbmvax (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 20

In article <3005@ultb.isc.rit.edu> smc8516@ultb.isc.rit.edu (S.M. Curtin) writes:
> I have a fully populated (1.5mb) Spirit Inboard-500 on my machine. One
> of the drawbacks of it is that it will not autoconfig when addressed at
> any other place than $c00000 (where things seem to autoconfig
> naturally.)I have a 501 residing there, however, so until I get a new
> agnus, I cannot address my SpritBoard at that location.

> I would like to know if it would be possible, perhaps with the addition
> of just a few extra logic chips, to make the board autoconfig.

The essentials of Auto-config are described in the A1000 expansion architecture
manual and duplicated (less examples) in the A500/A2000 technical reference
manual.

Basically, you'll need a PAL or two and some TTL circuity.  I'd expect it
to be much easier (but perhaps less fun) to simply use an ECS Agnus chip.
-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr@cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)