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From: hsgj@batcomputer.tn.cornell.edu (Dan Green)
Newsgroups: comp.sys.amiga
Subject: Re: sprites
Message-ID: <2450@batcomputer.tn.cornell.edu>
Date: Thu, 24-Sep-87 20:21:19 EDT
Article-I.D.: batcompu.2450
Posted: Thu Sep 24 20:21:19 1987
Date-Received: Sat, 26-Sep-87 18:16:21 EDT
References: <3933@zen.berkeley.edu>
Reply-To: hsgj@tcgould.tn.cornell.edu (Dan Green)
Distribution: world
Organization: Cornell Theory Center, Cornell University, Ithaca NY
Lines: 42

In article <3933@zen.berkeley.edu> bryce@hoser.berkeley.edu (Bryce Nesbitt) writes:
>>I've got a small problem with my sprites, and maybe someone knows the cause.
>>When I run programs like Sproing! or PacMan87 instead of just the normal
>>sprites, tall verticle lines attatched to the sprite appear along with some
>>garbage that move along with the sprites.  They are just "flaked out."
>>[why?]
>
>1> You have an overscan Workbench, created with morerows or ScnSizer.
>2> The screen centering gadget in preferences is set too far to the left.
>3> Your hardware is indeed defective.
> (") 	bryce@hoser.berkeley.EDU -or- ucbvax!hoser!bryce

I have experienced "problems" with my Sprites, too.  In the shareware
PacMan87 game, one sprite (the pacman mouth guy) has the vertical bar
about 16 pixels wide and the height of the whole screen; the bar is
centered in the pacman.  When the pacman moves, the bar moves, so it
is "stuck" inside the sprite (Mr. Technical Terms here...).

My workbench is the old standard, so problem (1) does not apply.
I have my centering gadget exactly in the center of the box in
preferences, so problem (2) does not apply.  So I figured that problem
(3) eg bad hardware must be the case.

But - I went to my dealer's and took the PacMan87 program.  The dealer
ran the program on his brand new Amiga 500 with 512K only.  Guess what --
the same vertical line was in the pacman sprite.

Now either this town has high cosmic rays that damage only 1 sprite out
of 8 on every Amiga, or there is a bug in the program.  I would be curious
to know whether someone got PacMan87 to work without this bug.

PS: While I was at the dealer's, several people called asking him for
Amiga 500's.  Guess what -- in under one week he had sold his entire
allotment of Amiga 500's, except the one that he was using for his
own entertainment.  I have no idea how big an "allotment" is, but the
store was doing considerably more business then it was last semester.
Praise the 500!

-- Dan Green
-- 
ARPA:  hsgj@tcgould.tn.cornell.edu
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