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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.
Counter Steer (Data East Corporation, 1985)
Memory Area:cntsteer_cpu1_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM, Sharedshare1
0x1000-0x11FF512RAM, Sharedspriteram
0x2000-0x23FF1024RAM Write, Sharedcntsteer_foreground_vram_w, videoram
0x2400-0x27FF1024RAM Write, Sharedcntsteer_foreground_attr_w, colorram
0x30001Writecntsteer_sub_nmi_w
0x30011Writecntsteer_sub_irq_w
0x8000-0xFFFF32768ROM
Memory Area:cntsteer_cpu2_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM, Sharedshare1
0x1000-0x1FFF4096RAM Write, Sharedcntsteer_background_w, videoram2
0x2000-0x2FFF4096Read/Writecntsteer_background_mirror_r,cntsteer_background_w
0x30001Read PortDSW0
0x0003Coin_AActive High
0x00002C_1CActive High
0x00031C_1CActive High
0x00021C_2CActive High
0x00011C_3CActive High
0x000cCoin_BActive High
0x00002C_1CActive High
0x000c1C_1CActive High
0x00081C_2CActive High
0x00041C_3CActive High
0x0010Service_ModeActive High
0x0010OffActive High
0x0000OnActive High
0x0020UnknownActive High
0x0020OffActive High
0x0000OnActive High
0x0040DifficultyActive High
0x0040NormalActive High
0x0000HardActive High
0x0080UnknownActive High
0x0080OffActive High
0x0000OnActive High
0x3000-0x30045Writecntsteer_vregs_w
0x30011Readcntsteer_adx_r
0x30021Read PortP1
0x000fPedalActive High
0x0010Start 1Active Low
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x30031Read PortCOINS
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080CustomActive High
0x30051Writegekitsui_sub_irq_ack
0x30061Writecntsteer_main_irq_w
0x30071Writecntsteer_sound_w
0x30071Read NOP(//m6809 bug.)
0x4000-0xFFFF49152ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM
0x20001Device Writeay1, ay8910_device, data_w
0x40001Device Writeay1, ay8910_device, address_w
0x60001Device Writeay2, ay8910_device, data_w
0x80001Device Writeay2, ay8910_device, address_w
0xA0001Device Readsoundlatch, generic_latch_8_device, read
0xD0001Writenmimask_w
0xE000-0xFFFF8192ROM
 

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
0xE000-0xFFFF8192by00CRC(740e4896) (Fluke: 71FF)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192by09CRC(273eddae) (Fluke: 05AA)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384by03CRC(d9537d33) (Fluke: 24E9)
0x4000-0x7FFF16384by04CRC(4f4e9d6f) (Fluke: 069E)
0x8000-0xBFFF16384by05CRC(592481a7) (Fluke: 5FBC)
0xC000-0xFFFF16384by06CRC(9366e9d5) (Fluke: 20D6)
0x10000-0x13FFF16384by07CRC(8321e332) (Fluke: 3303)
0x14000-0x17FFF16384by08CRC(a24bcfef) (Fluke: 57E9)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384by13CRC(d38e94fd) (Fluke: C202)
0x10000-0x13FFF16384by15CRC(b0c9de83) (Fluke: 3D42)
0x20000-0x23FFF16384by17CRC(8aff285f) (Fluke: 4B69)
0x30000-0x33FFF16384by19CRC(7eff6d02) (Fluke: A77E)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192by14CRC(4db6c146) (Fluke: 4004)
0x10000-0x11FFF8192by16CRC(adede1e6) (Fluke: 4CF2)
0x20000-0x21FFF8192by18CRC(1e9ce047) (Fluke: 1605)
0x30000-0x31FFF8192by20CRC(e2198c9e) (Fluke: 0869)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x8000-0xBFFF16384by02CRC(b6fdd7fd) (Fluke: 82BA)
0xC000-0xFFFF16384by01CRC(932423a5) (Fluke: 13A3)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256by21.j4All 82s129 or equivalent
0x0100-0x01FF256by22.j5
0x0200-0x02FF256by23.j6
Memory Area:subcpu
Address RangeLengthLabel/LocationDescription
0x4000-0x7FFF16384by12CRC(278e7fed) (Fluke: EFD0)
0x8000-0xBFFF16384by11CRC(00624e34) (Fluke: 6E07)
0xC000-0xFFFF16384by10CRC(9227a9ce) (Fluke: 2D14)
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