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- Path: mail2news.demon.co.uk!PRIMDOM-Message_Server
- From: mello.med@shands.ufl.edu
- Newsgroups: comp.sys.cbm
- Subject: How did they do that?
- Date: Mon, 22 Jan 1996 07:40:11 -0500
- Message-ID: <s1033e9c.075@shands.ufl.edu>
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-
- My wife aksed me a programming question that I was unable to
- answer. We have a cartridge by Atarisoft called Galaxian. Her
- question, and mine now is, how did they get all that movement on
- the screen at one time with only 8 sprites. Now I know being a
- somewhat novice 64 coder that more than 8 sprites are achievable
- through interrupts and that you can also use programmable
- characters for some programs. But there seems to be alot of
- movement on this game. Does anyone know how they achieved this?
- I did notice that when the aliens come down from their pattern
- that a black overlap (very small) can be seen as the ships move
- by the background (other ships). I don't know if anyone
- remembers, but Galaxian is a cross of Space Invaders and Galaga
- where the aliens are lined up in columns and then break off in
- groups to the bottom of the screen.
-
- I know there are quite a few good hackers out there can answer
- this question ;-).
-
- Thanks!
-
- Steve M.
- E-mail mello.med@shands.ufl.edu
-
-
-