>1. What is the purpose of the programmable DAC reference current in
games
>such as Star Wars and BattleZone. DVG games upto and including Asteroids
>Deluxe and Space Dual though using a similar circuit, have a fixed DAC
>reference current. Why?
I think they use the programmable reference voltage as a means of varying
the size of the entire image on the screen. I was working on a _Gravitar_
board recently, trying to track down a video problem. During attract mode,
the _Gravitar_ logo pulses in and out -- like it's rushing towards you, then
backing off. When I removed the DAC that controls the reference voltage,
the logo remains one size constantly.
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Received on Wed Mar 14 20:42:18 2001
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