Subject: Re: [stella] Repository|
From: Piero Cavina <p.cavina@xxxxxxxxxxxxx>
Date: Mon, 23 Feb 1998 17:45:14 +0100
At 06.11 23/02/98 -0800, Greg Troutman wrote: >Nick S Bensema wrote: >> >> > 1- learn the basic concepts from the programmer's guide. And I mean >> > "basic": don't waste time on VDEL, for example! What's the use of VDEL, >> > anyway? ;-) >> >> It's my understanding that when VDEL is enabled, a player's graphics don't >> change immediately when its data register changes; it waits until the >> next write to player data before it makes the change. This was intended >> to allow single-scanline positioning in double-scanline kernels, but >> its most common use is in six-digit scoring routines. I was almost joking, VDEL is very important, thought maybe it's not a clear issue at all - and I did't use it in Oystron. Exercise: take a simple kernel, let's say Adventure, remove the VDEL (just change the STA VDELPx to two NOPs with PCAE) and see what happens. P. -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html Don't post pirate BINs to Stellalist. Be a programmer, not a pirate. Write the best game, win framed autographs of famous Atari alumni!!