[Oct/11/98]

SPEED BALL  1987  DESYSTEM

CPU Z80

SOUND Z80 & YM3812

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[MAME]

Speed Ball

Memory map

Z80 MAIN CPU
0000-7fff ROM 1 32k
8000-dbff ROM 2 data
dc00-dfff for both CPU&SOUND (Shared)
e000-e1ff Video RAM background tiles 16*16 (2 bytes: 1 for tile char + 1 for color)
e800-efff Video RAM characters 32*32 (2 bytes: 1 for char and 1 for color)
f000-feff RAM
ff00-ffff Sprites (64 total: four bytes to one)

in:
00	DSW ONE
10	DSW TWO
20	IN1  JOY 1 STATUS & COIN & START
30	IN2  JOY 2 STATUS & TILT

out:
40	????
50	????  maybe VSYNC ????

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Z80 SOUND
0000-7fff ROM
dc00-dfff shared with MAIN CPU
f000-dfff RAM

out:
00	YM3812 control
01	YM3812 data
20	??

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  Colors :   2 bits for foreground characters =  4 colors * 16 palettes
	     4 bits for background tiles      = 16 colors * 16 palettes
	     4 bits for sprites	       = 16 colors * 16 palettes
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