Re: Testing XY Output.

Now I'm no Star Wars expert (nor do I play one on MAME) but I think your
wrong. During the attract sequence, the high scores and instructions fade to
black while the rest of the screen stays at full intensity. Also, the Star
Wars logo (scrolling up in perspective) is at full intensity at the top of
each letter and fades to black at the bottom of each letter.

-roy-

----- Original Message -----
From: "Christopher X. Candreva" <chris@westnet.com>
To: <vectorlist@synthcom.com>
Sent: Saturday, October 06, 2001 10:21 AM
Subject: Re: VECTOR: Testing XY Output.

> On Fri, 5 Oct 2001 mccullar@flash.net wrote:
>
> > Unfortunately, Atari doesn't use that Z signal on all of their color
vector
> > games. I forget which one, but I recall trying to make use of it but
found
> > out that the mixing transistor had never been installed. Don't know
why; it
> > had been built that way from the factory.
>
> I won't argue with your results testing a game, but what I was saying is
> that there is no 'mixing transistor', nor any 'mixing' going on at all. (I
> should say I am going by the Star Wars schematics here. )
>
> There is one DAC that contols the intensity, and three latches that decide
> what combination of colors is on at that intensity. In other words, you
> can't have full-green and half-blue. The Z test-point is the raw output of
> the (single) Z amplifer, regardless of color.
>
> There is only one intensity driver, not three, so they don't get mixed.
> It more like the Z is 'split' to the three colors.
>
> This limits your color selections to basicly 7 colors (8 if you count
> black), and I suppose contributes to the look of vector games as we know
> them. I wonder how much more could actually be done if the three color
> intensities could be individually controlled, and if it would have
effected
> the performancesof the CPU's of the time.
>
> -Chris
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 967-7816
> WestNet Internet Services of Westchester
> http://www.westnet.com/
>
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Received on Sat Oct 6 09:29:20 2001