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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.
DonPachi (Cave (Atlus license), 1995)
Memory Area:donpachi_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM(// ROM)
0x100000-0x10FFFF65536RAM(// RAM)
0x200000-0x207FFF32768RAM Write, Sharedcave_vram_1_w, vram.1 (// Layer 1)
0x300000-0x307FFF32768RAM Write, Sharedcave_vram_0_w, vram.0 (// Layer 0)
0x400000-0x407FFF32768RAM Write, Sharedcave_vram_2_8x8_w, vram.2 (// Layer 2)
0x500000-0x507FFF32768RAM, Sharedspriteram.0 (// Sprites)
0x508000-0x50FFFF32768RAM, Sharedspriteram_2.0 (// Sprites?)
0x900000-0x90007F128RAM Read, Shareddonpachi_videoregs_r, videoregs.0 (// Video Regs)
0xB00000-0xB000034Device Read/Write 8-bitoki1, okim6295_device, read, write, 0x00ff (// M6295)
0xB00010-0xB000134Device Read/Write 8-bitoki2, okim6295_device, read, write, 0x00ff (//)
0xB00020-0xB0002F16Device Write 8-bitnmk112, nmk112_device, okibank_w, 0x00ff (//)
0xC00000-0xC000012Read PortIN0 (// Inputs)
0xC00002-0xC000032Read PortIN1 (// Inputs + EEPROM)
0xD00000-0xD000012Writecave_eeprom_msb_w (// EEPROM)
 

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:layer0
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576atdp.u54CRC(6bda6b66) (Fluke: E9A5)
0x0000-0xFFFFF1048576atdp.u54CRC(6bda6b66) (Fluke: E9A5)
0x0000-0xFFFFF1048576atdp.u54CRC(6bda6b66) (Fluke: E9A5)
0x0000-0xFFFFF1048576atdp.u54CRC(6bda6b66) (Fluke: E9A5)
Memory Area:layer1
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576atdp.u57CRC(0a0e72b9) (Fluke: AF37)
0x0000-0xFFFFF1048576atdp.u57CRC(0a0e72b9) (Fluke: AF37)
0x0000-0xFFFFF1048576atdp.u57CRC(0a0e72b9) (Fluke: AF37)
0x0000-0xFFFFF1048576atdp.u57CRC(0a0e72b9) (Fluke: AF37)
Memory Area:layer2
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144text.u58CRC(5dba06e7) (Fluke: 897B)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x40000-0x23FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x40000-0x13FFFF1048576atdp.u32CRC(0d89fcca) (Fluke: 07E6)
0x40000-0x13FFFF1048576atdp.u32CRC(0d89fcca) (Fluke: 07E6)
0x40000-0x13FFFF1048576atdp.u32CRC(0d89fcca) (Fluke: 07E6)
0x40000-0x13FFFF1048576atdp.u32CRC(0d89fcca) (Fluke: 07E6)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
0x140000-0x33FFFF2097152atdp.u33CRC(d749de00) (Fluke: 182C)
Memory Area:pal
Address RangeLengthLabel/LocationDescription
0x0000-0x0154341peel18cv8p-15.u18CRC(3f4787e9),PEEL18CV8P-15
0x0000-0x0154341peel18cv8p-15.u18CRC(3f4787e9),PEEL18CV8P-15
0x0000-0x0154341peel18cv8p-15.u18CRC(3f4787e9),PEEL18CV8P-15
0x0000-0x0154341peel18cv8p-15.u18CRC(3f4787e9),PEEL18CV8P-15
Memory Area:sprites0
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152atdp.u44CRC(7189e953) (Fluke: 1177)
0x0000-0x1FFFFF2097152atdp.u44CRC(7189e953) (Fluke: 1177)
0x0000-0x1FFFFF2097152atdp.u44CRC(7189e953) (Fluke: 1177)
0x0000-0x1FFFFF2097152atdp.u44CRC(7189e953) (Fluke: 1177)
0x200000-0x3FFFFF2097152atdp.u45CRC(6984173f) (Fluke: 722C)
0x200000-0x3FFFFF2097152atdp.u45CRC(6984173f) (Fluke: 722C)
0x200000-0x3FFFFF2097152atdp.u45CRC(6984173f) (Fluke: 722C)
0x200000-0x3FFFFF2097152atdp.u45CRC(6984173f) (Fluke: 722C)
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