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Path: utzoo!attcan!uunet!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech,comp.sys.amiga.hardware
Subject: Re: A3000 Video Chips
Message-ID: <13110@cbmvax.commodore.com>
Date: 9 Jul 90 01:12:35 GMT
References: <4741@munnari.oz.au> <13060@cbmvax.commodore.com> <16713@windy.dsir.govt.nz> <1091@mpirbn.mpifr-bonn.mpg.de>
Reply-To: grr@cbmvax (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 24

In article <1091@mpirbn.mpifr-bonn.mpg.de> p554mve@mpirbn.UUCP (Michael van Elst) writes:
> In article <16713@windy.dsir.govt.nz> SRWMCLN@windy.dsir.govt.nz (Clive Nicolson) writes:
> >In article <13060@cbmvax.commodore.com>, peter@cbmvax.commodore.com (Peter Cherna) writes:
> >> The ECS chipset is capable of both NTSC and PAL.  In the A3000, there is
> >But does the jumper change the colour sub carrier frequency too, or just the
> >number of lines. That is exactly what does the jumper change.
> 
> As far as I know, neither the A2000 nor the A3000 are producing a
> composite video signal that could contain a colour sub carrier.
> Their output are separate R,G and B signals. The differences between
> PAL and NTSC modes are timing differences only.

Ah, but both machines do provide one of the ~3.58 MHz clock phases as a
reference signal for the video slot, which might contain either a color
encoder or some other video toy.

Even if used with some external color encoder, it might be a good idea
to have video and sync running pretty close to spec, though I'm not sure
how much this would matter for most applications.

-- 
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)