System Information:
The Taito F2 system is a fairly flexible hardware platform. It supports 4
separate layers of graphics - one 64x64 tiled scrolling background plane
of 8x8 tiles, a similar foreground plane, a sprite plane capable of handling
all the video chores by itself (used in e.g. Super Space Invaders) and a text
plane which may or may not scroll. The text plane has 8x8 characters which
are generated in RAM. Information is based on the Liquid KidsBrom.
Sound is handled by a Z80 with a YM2610 connected to it.
CPU 1 : 68000, uses irqs 5 & 6.
Main CPU Memory Map:
$000000 - $0FFFFF : ROM (not all used)
$100000 - $10FFFF : 64k of RAM
$200000 - $201FFF : palette RAM, 4096 total colors
$300000 - $30000f : input ports and dipswitches (writes may be IRQ acknowledge)
$300000 - $300001 : irq ack? liquidk (Write)
$320000 - $320003 : communication with sound CPU
$800000 - $803FFF : 64x64 background layer
$804000 - $805FFF : 64x64 text layer
$806000 - $807FFF : 256 (512?) character generator RAM
$808000 - $80BFFF : 64x64 foreground layer
$80C000 - $80FFFF : unused?
$820000 - $820005 : x scroll for 3 layers (3rd is unknown)
$820006 - $82000B : y scroll for 3 layers (3rd is unknown)
$82000C - $82000F : unknown (leds?)
$900000 - $90FFFF : 64k of sprite ram
$B00002 - $B00002 : watchdog?
Input:
$300000 Dip Switch A
$300002 Dip Switch A
$300004 Player Input 0
$01 Up
$02 Down
$04 Right
$08 Left
$10 Button 1
$20 Button 2
$40 ?
$80 Start
$300006 Player Input 1
Same as player 1
$300008 Player Input 2
Same as player 1
PaletteFormat:
$RGBx (2 Bytes)
There are 256 palettes of 16 colors each.
Sprite format:
$0000: 000xxxxxxxxxxxxx : tile code ($0000 - $1fff)
$0002: unused?
$0004: 0000xxxxxxxxxxxx : x-coordinate absolute (-$1ff to $01ff)
0x00000000000000 : don't compensate for scrolling ??
$0006: 0000xxxxxxxxxxxx : y-coordinate absolute (-$1ff to $01ff)
$0008: 00000000xxxxxxxx : color ($00 - $ff)
000000xx00000000 : flipx & flipy
00000x0000000000 : if clear, latch x & y coordinates, tile & color ?
0000x00000000000 : if set, next sprite entry is part of sequence
000x000000000000 : if clear, use latched y coordinate, else use current y
00x0000000000000 : if set, y += 16
0x00000000000000 : if clear, use latched x coordinate, else use current x
x000000000000000 : if set, x += 16
$000A - $000F : unused?
Additionally, the first 3 sprite entries are configuration info instead of actual
sprites:
offset $24: sprite x offset
offset $26: sprite y offset
Background/Foreground/Text Layer:
Format of a Foreground/Background Tilemap:
$AABBCCCC (4 Bytes)
AA Flip.
$80 is Vertical
$40 is Horizontal
BB Palette (0 to $FF)
CCCC Tile Number.
Format of a Text tilemap:
$ABCC (2 Bytes)
A Flip.
$8 is Vertical
$4 is Horizontal
B Palette (0 - 15)
CC Tilenumber (0 - 255)
The screen is flipped horizontally and vertically.
There are -256 bytes between vertical positions, and -4 bytes between horizontal
positions.
The font graphics are stored starting at $806000, and are 4096 bytes long.
Scroll Registers:
$820000 - $820001 Background layer X Scroll
$820002 - $820003 Foreground layer X Scroll
$820004 - $820005 ? layer X Scroll
$820006 - $820007 Background layer Y Scroll
$820008 - $820009 Foreground layer Y Scroll
$82000A - $82000B ? layer X Scroll
Graphics Format:
width = 16
height = 16
total = 8192
planes = 4
planeoffsets = 0 1 2 3
xoffsets = 4 0 12 8 20 16 28 24 36 32 44 40 52 48 60 56
yoffsets = 0 64 128 192 256 320 384 448 512 576 640 704 768 832 896 960
charincrement = 1024
width = 8
height = 8
total = 32768
planes = 4
planeoffsets = 0 1 2 3
xoffsets = 8 12 0 4 24 28 16 20
yoffsets = 0 32 64 96 128 170 192 224
charincrement = 256
width = 8
height = 8
total = 256
planes = 2
planeoffsets = 0 8
xoffsets = 0 1 2 3 4 5 6 7
yoffsets = 0 16 32 48 64 80 96 112
charincrement = 128
