Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!tank!eecae!abaa!esker
From: esker@abaa.uucp (Lawrence Esker)
Newsgroups: comp.sys.amiga
Subject: Overscan verses Sprites (Was: ghost)
Keywords: sprite problem (?)
Message-ID: <3931@abaa.UUCP>
Date: 9 Oct 89 21:27:32 GMT
References: <13370@nsc.nsc.com>
Reply-To: esker@abaa.UUCP (Lawrence Esker)
Organization: Allen Bradley
Lines: 22

In article <13370@nsc.nsc.com> chaim@nsc.nsc.com (Chaim Bendelac) writes:
>I recently downloaded a game from a local bbs. It uses what I think
>is a sprite in the form of a volleyball. However, instead of showing
>itself in its round form, the ball is displayed as a ghostly white
>stripe all over the length of my screen. I have tried "nofastmem"
>but cannot get it right. I have seen this effect with other PD programs,
>and I am starting to worry. Is there something wrong with my A500?

No problems with your machine.  You are using an overscan screen probably via
MoreRows.  There is some sort of contention problem between using Spites and
overscan screens.  I had always thought it was only when using all 7 sprites
and overscan until the VolleyBall and PacMan games proved me wrong.  I have
always been meaning to get Commodore to tell me exactly where the problem lies,
ie. ASIC's, Hardware, Amiga software, or improperly written user software.

Hopefully someone a C= can give more detail and when the problems will be
fixed.  Until then, you can develop a special boot disk that is a normal
640 wide screen and play your sprite based games from it.
--
---------- Lawrence W. Esker ----------  Modern Amish: Thou shalt not need any
                                         computer that is not IBM compatible.
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