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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.
Change Lanes (Taito Corporation, 1983)
Memory Area:changela_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x83FF1024RAM, Sharedspriteram (/* OBJ0 RAM */)
0x9000-0x97FF2048RAM, Sharedvideoram (/* OBJ1 RAM */)
0xA000-0xA07F128Write, Sharedchangela_colors_w, colorram (/* Color 93419 RAM 64x9(nine!!!) bits A0-used as the 8-th bit data input (d0-d7->normal, a0->d8) */)
0xB000-0xBFFF4096ROM
0xC000-0xC7FF2048Read/Writechangela_mem_device_r, changela_mem_device_w (/* RAM4 (River Bed RAM); RAM5 (Tree RAM) */)
0xC8001Write NOP(/* not connected */)
0xC9001Writechangela_mem_device_select_w (/* selects the memory device to be accessible at 0xc000-0xc7ff */)
0xCA001Writechangela_slope_rom_addr_hi_w
0xCB001Writechangela_slope_rom_addr_lo_w
0xD000-0xD0012Device Read/Writeay1, ay8910_device, data_r, address_data_w
0xD010-0xD0112Device Read/Writeay2, ay8910_device, data_r, address_data_w
0xD0201Writechangela_collision_reset_0
0xD021-0xD0222Writechangela_coin_counter_w
0xD0241Read/Writechangela_24_r, mcu_pc_0_w
0xD0251Read/Writechangela_25_r, changela_collision_reset_1
0xD0261Write NOP
0xD0281Readmcu_r
0xD02C1Readchangela_2c_r
0xD02D1Readchangela_2d_r
0xD0301Read/Writechangela_30_r, mcu_w
0xD0311Readchangela_31_r
0xE0001Device Writewatchdog, watchdog_timer_device, reset_w (/* Watchdog */)
0xF000-0xF7FF2048RAM(/* RAM2 (Processor RAM) */)
Memory Area:mcu_map
Address RangeLengthFunctionDescription
0x00001Read/Writechangela_68705_port_a_r, changela_68705_port_a_w
0x0000-0x007F128RAM
0x00011Read/Writechangela_68705_port_b_r, changela_68705_port_b_w
0x00021Read/Writechangela_68705_port_c_r, changela_68705_port_c_w
0x00041Writechangela_68705_ddr_a_w
0x00051Writechangela_68705_ddr_b_w
0x00061Writechangela_68705_ddr_c_w
0x0080-0x07FF1920ROM
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192cl111CRC(41c0149d) (Fluke: 7925)
0x2000-0x3FFF8192cl113CRC(ddf99926) (Fluke: 4A4F)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096cl46CRC(9c0a7d28) (Fluke: 6209)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192cl25aCRC(38530a60) (Fluke: 094B)
0x2000-0x3FFF8192cl24aCRC(2fcf4a82) (Fluke: 47D6)
0x4000-0x5FFF8192cl23CRC(08385891) (Fluke: 132E)
0x6000-0x7FFF8192cl22CRC(796e0abd) (Fluke: AB01)
0xB000-0xBFFF4096cl27CRC(3668afb8) (Fluke: 54FD)
Memory Area:mcu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048cl38aCRC(b70156ce) (Fluke: 6086)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32cl88CRC(da4d6625),math train state machine (Fluke: 65FE)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192cl100CRC(3fa9e4fa) (Fluke: 801D)
0x2000-0x3FFF8192cl99CRC(67b27b9e) (Fluke: B5CC)
0x4000-0x5FFF8192cl98CRC(bffe4149) (Fluke: B324)
0x6000-0x7FFF8192cl97CRC(5abab8f9) (Fluke: 4C16)
Memory Area:user2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096cl44CRC(160d2bc7),first and 2nd half identical (Fluke: A925)
Memory Area:user3
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048cl7CRC(01e3efca),fixed bits: 0xxxxxxx (Fluke: 95A0)
0x1000-0x2FFF8192cl9CRC(4e53cdd0) (Fluke: 7916)
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