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Path: utzoo!utgpu!water!watmath!clyde!rutgers!cbmvax!grr
From: grr@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Monitor mishmash
Message-ID: <2654@cbmvax.UUCP>
Date: Thu, 29-Oct-87 04:59:32 EST
Article-I.D.: cbmvax.2654
Posted: Thu Oct 29 04:59:32 1987
Date-Received: Sat, 31-Oct-87 18:57:55 EST
References: <3248@ccicpg.UUCP> <2616@cbmvax.UUCP> <3373@ccicpg.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 41

In article <3373@ccicpg.UUCP> harald@ccicpg.UUCP ( Harald Milne) writes:
> In article <2616@cbmvax.UUCP>, daveh@cbmvax.UUCP (Dave Haynie) writes:
> > in article <3248@ccicpg.UUCP>, harald@ccicpg.UUCP ( Harald Milne) says:
> > > If so, will the form factor of this add on not interfere
> > > with the extended connector so some other card can exist in it's slot?
> > > Or will it pass/propogate these signals if it does?
> > 
> > Huh?  There's ONE video slot, with two connectors in line with each other.
> > Only one video card goes in any machine, and a video card will not conflict
> > with any other expansion device; it's on the other side of the machine.
> 
> 	This almost answers my question. So in your mind there is a video card
> that uses both slots? The video connector slot has enough signals to make a
> composite video signal, correct? I thought just to do this would take up only
> the video connector. This is what I meant by form factor. You could have
> 2 cards in these slots, except the extended video connector has no power.
> 	This means you have to be careful of what you put in these slots. And
> this is my concern. It also appears that there is a byte wide bus available.
> Are A2000 genlocks also using these connectors? 

No, the idea is that there is one slot, which in the original A2000 design
had one edge card connector that basically picked up the same signals as
were present on the external 23-pin video connector.  When we revised this
design to incorporate the newer custom chips developed for the A500, we
realized that we hadn't been very imaginative, and that there were many
interesting things that could be done if you had access to all the digital
RGB bits, some clock and control signals.  We then added a second connector
so that a single video card could pick up either the basic or the basic and
extended video signals.  There was no intention that the slot should be
occupied by two "half-cards", it not clear what utility there would be with
such a setup.

Normally, this slot would be empty or occupied by a composite color encoder
card.  If you put some interesting new device in the slot, you would have
to remove the color card, but it the card is a genlock or something similar,
it may provide its own composite output.

-- 
George Robbins - now working for,	uucp: {ihnp4|rutgers|allegra}!cbmvax!grr
but no way officially representing	arpa: out to lunch...
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)