Date   : Sat, 12 Oct 2002 18:43:03 +0100
From   : "james watson" <james@...>
Subject: Software sprites

HI there

How do games like firetrack and especially galaforce which has about ten
large software sprites of 16/16 on the screen moving very fast with out
any flicking. I have a routine which is taken out of the micro user from
a series called how to write arcade games, written by Kevin Edwards from
1985. The routine uses zero page locations for variables and direct
screen addressing. I have  adapted it so the sprite print routine is
called under a interrupt right at the start of vertical synchronisation.
so you don't get any flicker at the top. But even with this i can only
get 4 or 5 small  sprites about 10/8 to move about most of the screen
without any flicker. Has anybody a faster sprite print routine or can
anybody advise on how to get better results.

Cheers 

James