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From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.misc
Subject: Re: I/O Expansion Board
Message-ID: <19212@cbmvax.commodore.com>
Date: 22 Feb 91 02:01:43 GMT
References: <21321@know.pws.bull.com>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 34

In article <21321@know.pws.bull.com> mohabir@arisia.Xerox.COM (Daniel A. Mohabir) writes:

>I have the Commodore's "SCHEMATICS AND EXPANSION SPECIFICATIONS,   JUNE 9, 
>1986" for the A1000 (Yes, I did own an A1000 also). If I design a Zorro card 
>based on these specifications, will the card work in an A2000 And A3000?

While the revised book of a similar nature, "A500/A2000 Technical Reference
Manual" is slightly clearer, I don't know of any problems with the A1000 
book.  Or, to look at it in a slightly different light, I have tested quite
a few boards designed based on that book in the A3000 (the A2090a and A2052
come to mind), and they work.

>If not, what documentation should I use to get specifications for a Zorro II 
>card? Ideally, I would like to get the Hardware specs and complete memory map 
>for the A3000 but I am not sure if they are available. Besides, I am NOT an 
>official developer.

I don't know what's being made available for the A3000.  Most of the A3000 has
been documented since before it shipped (a first!), but the best technical 
specs so far are only in the Atlanta DevCon notes.  The A3000's Zorro III
Specification only mentions the Zorro II bus in passing.  It indicates a few
thing to watch out for in Zorro II designs, and show you how a Zorro II
cycle fits into a Zorro III cycle.  Most of the caveats address problems with
marginal designs, or using unsupported features like VPA* and VMA* on the
bus.  If you follow the original rules very closely, you shouldn't have any
trouble.

>|  Daniel A. Mohabir           |  Phone:         |  Amiga.            |


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	"What works for me might work for you"	-Jimmy Buffett