Re: Stupid Battlezone tricks...

>OK, if that's all that is needed, then in src/drivers/bzone.c , change
>line 649 from:
>
> ROM_RELOAD( 0xf800, 0x0800 ) /* for reset/interrupt
>vectors
>to
> ROM_LOAD( "036408.01", 0xf00, 0x0800, 0xthechecksum )

Yout got it, there's a typo though-- should be:

ROM_LOAD("036408.01",0xf800,0x0800,0x00000000)

(the 0xf800 is the typo, the 0x00000000 is just fine for a checksum-- MAME
will whine about "NOGOODCHECKSUM" but it'll work just dandy)

I'd calculate the checksum, but I'm changing things every couple of minutes,
so I'm too lazy to do it. ;-)

Oh, I just added "Gorfian Bullets" (funny, I bet about 60% of the people
reading this immediately know what those were when Doug first used the
term). That's pretty interesting-- the Missile is largely diminished as a
threat since you don't have to worry as much about missing.

I'll try to stash some ROMs and a modified version of MAME for DOS on my
webpage later tonight or tomorrow. If you recompile MAME with the above mod
and leave the debugger in you can make the following changes by plugging
some values into RAM (after the game starts and clears RAM):

FHMC BattleZone
03d0 = shot speed (00 = normal (same as 04), non-0 = speed 01=slow, 0C=very
fast, 7f=death-ray; bit 7 when set = 2x player shot speed)
03d1 = shot range (7f = normal, less is faster cycle rate/shorter range, >7F
doesn't work)
03d2 = turn speed right (0x80 "normal")
03d3 = turn speed left (0x80 "normal")
03d4 = gorfian bullets (00= off, >00= on)

I kinda like: 85 6f 88 88 00

I'm still messing with it a little tonight, but have to finish some Tempest
Multigames I've been owing people for ages...

-Clay

>Replacing 'thechecksum' with the checksum/crc MAME uses.
>
>This is relative to xmame 3.7 B7, and will make the Battlezone driver play
>the Clay version instead of the regular version. In 30 seconds, I haven't
>come up with an all new driver yet. :-)
>
>
>So -- if you would be so kind as to provide the images, and the CRC if
>you've got it, I can give it a whirl. Sorry -- no DOS compiler here. :-)
>
>-Chris
>
>==========================================================
>Chris Candreva -- chris@westnet.com -- (914) 967-7816
>WestNet Internet Services of Westchester
>http://www.westnet.com/
>
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Received on Thu Oct 12 00:39:50 2000