CPU : 2x68000 @ 12.288 MHz
Sound CPU : M6809 @ 3.072 MHz
MCU : HD63705 @ 2.048 MHz
Extra MCU : Namco C68 (not present in all games)
Sound chips : Yamaha YM2151 @ 3.57958 MHz FM + C140 24 channel stereo PCM sample player
The 4 CPU's are all connected via a central 2KByte dual port SRAM. The two
68000s are on one side and the 6809/63705 are on the other side.
Each 68000 has its own private bus area AND a common shared area between the
two devices, which is where the video ram/dual port/Sprite Generation etc
logic sits.
Standard Graphics Board (there are game specific variations):
2 x Static tile planes (36x28 tiles)
4 x Scolling tile planes (64x64 tiles)
1 x Rotate/Zoom tile plane (256x256 tiles)
128 Sprites (128 Sprites displayable, but 16 banks of 128 sprites)
Sound chips : YM2151 @ 3.57958 MHz + C140 (24 Channel Stereo PCM Sample player)
Video resoution : 288x224
Colours : The system has 8192 pens of which 4096+2048 are displayable at any given time. These pens reference a 24 bit colour lookup table (R8:G8:B8)
2 x Static tile planes (36x28 tiles)
4 x Scolling tile planes (64x64 tiles)
Board composition : Graphics Board and CPU board
Misc : The Namco System 2 board is a 5 CPU system. The complete system consists of two boards : CPU + GRAPHICS. The system is extremely powerful and flexible. A standard CPU board is coupled with a number of different graphics boards to produce a system.
Graphics Board : There are at least 3 more known variants of graphics board that all have their own unique capabilities and separate memory map definition, the Derivative games definately have a different GFX board to the standard one. The sprite tile layout is differnet and the GFX board has a separate roadway generator chip. The tiles for the roadway are all held in RAM on on the GFX board.
PCBS : CPU - Typical Video Board - System 2 Enhanced Video Board
Emulators : MAME
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