Re: Bug: Battlezone high score rendering

>From what I can tell in MAME (I don't own a BZ board), the bzone roms
display up to 10 tanks after each score, but in MAME only 7.5 - 8 are
visible before it is clipped. I could not get it to cause a noticible
problem in MAME, but I only just let it run through attract mode.
It would only be one byte of opcode to change the max number of tanks
displayed.

The bzone2 roms appear to only display ONE tank max next to the score.
And with the bzone2 roms the hs table is slanted. (bzone roms are straight).

Interesting, the game has HS space reserved for 3 bytes per score
(max score 999,999,000), however, the code to display the scores,
increment the scores etc... only uses 2 bytes (max 9,999,000).
Can people score more than 9,999,000 points, as in, is extended
scoring needed?

----- Original Message -----
From: "Doug Jefferys" <dougj@hwcn.org>
To: <vectorlist@vectorlist.org>
Sent: Tuesday, July 22, 2003 3:21 PM
Subject: VECTOR: Bug: Battlezone high score rendering

> On Tue, 22 Jul 2003, Scott Brasington wrote:
> >
> > Thanks for the quick reply. I thought that was just a bug in MAME
> > or something.
> >
> > If anybody knows of any BZ bugs or has ideas on *simple* feature requests,
> > please let me know. If they are simple enough to implement I might be able
> > to include them.
>
> One BZ bug that should be easy to fix comes to mind:
>
> After the initials/score, the high score table displays one tank per
> 100,000 points scored. For high scoring games (500000+), the tanks can
> stretch "off" the screen.
>
> As long as only three players have tanks "off" the screen, that's only a
> minor bug. (Noticeable flicker, maybe a little stress on a driver
> transistor, but only for a few seconds at a time).
>
> When all 10 players have 500K+ high scores (I've installed Mark Jenison's
> BZ score-save mod a few years ago and tweaked it to store the top 9 scores
> forever, which is how I triggered it), drawing *all* those tanks overflows
> a buffer in the state machine, leading to a corrupt display about 2/3 of
> the way through the high score table.
>
> Note: I've forgotten which rev of the ROMs I'm using and haven't looked at
> the original BZ score code. It's possible that this is the bug that was
> fixed between the two revisions of BZ?
>
> Later,
> Doug.
>
>
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Received on Tue Jul 22 17:40:26 2003