Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: OVR pin on GARY etc (PLEASE READ! SOMEONE AT C= FOR EXAMPLE)
Message-ID: <12248@cbmvax.commodore.com>
Date: 4 Jun 90 18:11:54 GMT
References: <1990Jun2.075504.13303@nada.kth.se>
Reply-To: grr@cbmvax (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 37

In article <1990Jun2.075504.13303@nada.kth.se> nv89-rbi@nada.kth.se (Ron Birk) writes:
> 
> Hi there!
> 
> A friend of mine, and I are working on a serious project on the Amiga.
> It is already 12000 lines source. But then the hardware will come through.
> So we have some questions, that I hope someone could send me some answers!
> Doesnt matter if you just know something about it, or could reference me
> to a place where I could get more information!

Probably the best starting point would be to get involved in the Commodore
developer support program.  This won't answer all your questions, but could
put you in better contact with developers who have addressed similar concerns.

You should also get copies of the A1000 expansion architecture document, the
A500/A2000 technical reference manual and perhaps the developers conference
notes.  These things are available through the developer support program.

To find out more, contact Commodore Sweeden, or the Commodore European Support
and Coordination group in the Commodore Frankfurt office..

> 1) I would like all information about the OVR (Override) pin on the GARY,
>    which are connected too pin 17 on the expansion bus.

The OVR pin is only support as a way for the an autoconfigured peripheral to
tell the system that it will assert DTACK rather than using the system provided
XRDY/DTACK mechanism.

> 3) The memory clock bits! We know how to set the time and date but not all
>    bits. I mean the expansion clock at $DC0000.

The clock chip writeup is in the A500/A2000 technical reference manual.

-- 
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)