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Memory Map

The following is a memory map that was generated based on the MAME source code (.180).  This information is only as accurate as the MAME driver is.  If you see any errors, please let me know what that error is.
 
The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.
Twin Action (Afega, 1995)
Memory Area:twinactn_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x80000-0x800012Read PortIN0
0x80002-0x800032Read PortIN1
0x80004-0x800052Read PortDSW1
0x0001UnknownActive High
0x0001OffActive High
0x0000OnActive High
0x0002Demo_SoundsActive High
0x0000OffActive High
0x0002OnActive High
0x001cCoin_BActive High
0x00104C_1CActive High
0x00083C_1CActive High
0x00182C_1CActive High
0x001c1C_1CActive High
0x000c1C_2CActive High
0x00141C_3CActive High
0x00041C_4CActive High
0x0000Free_PlayActive High
0x00e0Coin_AActive High
0x00804C_1CActive High
0x00403C_1CActive High
0x00c02C_1CActive High
0x00e01C_1CActive High
0x00601C_2CActive High
0x00a01C_3CActive High
0x00201C_4CActive High
0x0000Free_PlayActive High
0x0100Flip_ScreenActive High
0x0100OffActive High
0x0000OnActive High
0x0200UnknownActive High
0x0200OffActive High
0x0000OnActive High
0x0c00DifficultyActive High
0x0c00EasyActive High
0x0400NormalActive High
0x0800HardActive High
0x0000HardestActive High
0x1000UnknownActive High
0x1000OffActive High
0x0000OnActive High
0x2000UnknownActive High
0x2000OffActive High
0x0000OnActive High
0xc000LivesActive High
0x40002Active High
0xc0003Active High
0x80004Active High
0x00005Active High
0x8000E-0x8000F2Read/Write NOP
0x80014-0x800152Writenmk_flipscreen_w
0x80016-0x800172Write NOP(// frame number?)
0x8001E-0x8001F2Writeafega_soundlatch_w
0x88000-0x887FF2048RAM Device Write, Sharedpalette, palette_device, write, palette
0x8C000-0x8C0012Writemustang_scroll_w
0x8C002-0x8C087134Write NOP(// ??)
0x90000-0x93FFF16384RAM Write, Sharednmk_bgvideoram0_w, nmk_bgvideoram0
0x9C000-0x9C7FF2048RAM Write, Sharednmk_txvideoram_w, nmk_txvideoram
0xF0000-0xFFFFF65536RAM Write, Sharednmk16_mainram_strange_w, mainram
Memory Area:twinactn_sound_cpu
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x90001Writetwinactn_oki_bank_w
0x98001Device Read/Writeoki1, okim6295_device, read, write
0xA0001Device Readsoundlatch, generic_latch_8_device, read (// From Main CPU)
 

ROM Map for this game

 
This is the ROM map for the game.  This should tell you what address the ROM is at, how big it is, what it's used for.   
Memory Area:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288afega.ui20CRC(237c8f92) (Fluke: 7757)
0x0000-0x1FFFF131072afega.uj11CRC(3f439e92) (Fluke: F7D9)
0x0000-0x7FFF32768afega.su6CRC(3a52dc88) (Fluke: 1F2C)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072afega.su12CRC(91d665f3) (Fluke: B261)
0xA0000-0xBFFFF131072afega.su13CRC(30e1c306) (Fluke: A588)
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