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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.
Desert Assault (Data East Corporation, 1991)
Memory Area:dassault_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x100000-0x103FFF16384RAM Device Write, Shareddeco_common, decocomn_device, nonbuffered_palette_w, paletteram
0x140004-0x1400074Write NOP(/* ? */)
0x180000-0x1800012Writedassault_sound_w
0x1C0000-0x1C000F16Readdassault_control_r
0x1C000A-0x1C000B2Device Writedeco_common, decocomn_device, priority_w
0x1C000C-0x1C000D2Device Writespriteram2, buffered_spriteram16_device, write
0x1C000E-0x1C000F2Writedassault_control_w
0x200000-0x201FFF8192Device Read/Writetilegen1, deco16ic_device, pf1_data_r, pf1_data_w
0x202000-0x203FFF8192Device Read/Writetilegen1, deco16ic_device, pf2_data_r, pf2_data_w
0x212000-0x212FFF4096Write Only, Sharedpf2_rowscroll
0x220000-0x22000F16Device Writetilegen1, deco16ic_device, pf_control_w
0x240000-0x240FFF4096Device Read/Writetilegen2, deco16ic_device, pf1_data_r, pf1_data_w
0x242000-0x242FFF4096Device Read/Writetilegen2, deco16ic_device, pf2_data_r, pf2_data_w
0x252000-0x252FFF4096Write Only, Sharedpf4_rowscroll
0x260000-0x26000F16Device Writetilegen2, deco16ic_device, pf_control_w
0x3F8000-0x3FBFFF16384RAM, Sharedram (/* Main ram */)
0x3FC000-0x3FCFFF4096RAM, Sharedspriteram2 (/* Spriteram (2nd) */)
0x3FE000-0x3FEFFF4096Read/Write, Sharedshared_ram_r, shared_ram_w, shared_ram (/* Shared ram */)
0x3FEFFC-0x3FEFFF4Read/Writedassault_irq_r, dassault_irq_w
Memory Area:dassault_sub_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x100000-0x1000012Device Writespriteram, buffered_spriteram16_device, write
0x100002-0x1000076Write NOP(/* ? */)
0x100004-0x1000052Readdassault_sub_control_r
0x3F8000-0x3FBFFF16384RAM, Sharedram2 (/* Sub cpu ram */)
0x3FC000-0x3FCFFF4096RAM, Sharedspriteram (/* Sprite ram */)
0x3FE000-0x3FEFFF4096Read/Writeshared_ram_r, shared_ram_w
0x3FEFFC-0x3FEFFF4Read/Writedassault_irq_r, dassault_irq_w
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0xFFFF65536ROM
0x100000-0x1000012Device Read/Writeym1, ym2203_device, read, write
0x110000-0x1100012Device Read/Writeym2, ym2151_device, read, write
0x120000-0x1200012Device Read/Writeoki1, okim6295_device, read, write
0x130000-0x1300012Device Read/Writeoki2, okim6295_device, read, write
0x140000-0x1400012Device Readsoundlatch, generic_latch_8_device, read
0x1F0000-0x1F1FFF8192RAM Bankbank8
0x1FEC00-0x1FEC012Device Writeaudiocpu, h6280_device, timer_w
0x1FF400-0x1FF4034Device Writeaudiocpu, h6280_device, irq_status_w
 

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:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576maj-02.h14CRC(383bbc37) (Fluke: D841)
0x0000-0xFFFFF1048576maj-02.h14CRC(383bbc37) (Fluke: D841)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576maj-01.c18CRC(9840a204) (Fluke: 19FE)
0x0000-0xFFFFF1048576maj-01.c18CRC(9840a204) (Fluke: 19FE)
0x100000-0x1FFFFF1048576maj-00.c17CRC(87ea8d16) (Fluke: 10F6)
0x100000-0x1FFFFF1048576maj-00.c17CRC(87ea8d16) (Fluke: 10F6)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288maj-04.r1CRC(36e49b19) (Fluke: 704F)
0x0000-0x7FFFF524288maj-04.r1CRC(36e49b19) (Fluke: 704F)
0x80000-0xFFFFF524288maj-05.r2CRC(80fc71cc) (Fluke: E7B8)
0x80000-0xFFFFF524288maj-05.r2CRC(80fc71cc) (Fluke: E7B8)
0x100000-0x17FFFF524288maj-06.r3CRC(2e7a684b) (Fluke: 3336)
0x100000-0x17FFFF524288maj-06.r3CRC(2e7a684b) (Fluke: 3336)
0x180000-0x1FFFFF524288maj-07.r5CRC(3acc1f78) (Fluke: AE65)
0x180000-0x1FFFFF524288maj-07.r5CRC(3acc1f78) (Fluke: AE65)
0x200000-0x27FFFF524288maj-08.s6CRC(1958a36d) (Fluke: C45F)
0x200000-0x27FFFF524288maj-08.s6CRC(1958a36d) (Fluke: C45F)
0x280000-0x2FFFFF524288maj-09.s8CRC(c21087a1) (Fluke: 08F0)
0x280000-0x2FFFFF524288maj-09.s8CRC(c21087a1) (Fluke: 08F0)
0x300000-0x37FFFF524288maj-10.s9CRC(a02fa641) (Fluke: 14CF)
0x300000-0x37FFFF524288maj-10.s9CRC(a02fa641) (Fluke: 14CF)
0x380000-0x3FFFFF524288maj-11.s11CRC(dabe9305) (Fluke: 678A)
0x380000-0x3FFFFF524288maj-11.s11CRC(dabe9305) (Fluke: 678A)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072gs07.h15CRC(750b7e5d) (Fluke: 4FFB)
0x0000-0x1FFFF131072gs07.h15CRC(750b7e5d) (Fluke: 4FFB)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288maj-03.h16CRC(31dcfac3),banked (Fluke: E3F5)
0x0000-0x7FFFF524288maj-03.h16CRC(31dcfac3),banked (Fluke: E3F5)
Memory Area:plds
Address RangeLengthLabel/LocationDescription
0x0000-0x0103260pal16r8a 1hPAL is read protected
0x0000-0x0103260pal16r8a 1hPAL is read protected
0x0200-0x0303260pal16l8b.7cPAL is read protected
0x0200-0x0303260pal16l8b.7cPAL is read protected
0x0400-0x0503260pal16l8b.7dCRC(199e83fd),PAL is read protected (Fluke: 3A02)
0x0400-0x0503260pal16l8b.7dCRC(199e83fd),PAL is read protected (Fluke: 3A02)
0x0600-0x0703260pal16l8b.7ePAL is read protected
0x0600-0x0703260pal16l8b.7ePAL is read protected
0x0800-0x0903260pal16l8b.7lPAL is read protected
0x0800-0x0903260pal16l8b.7lPAL is read protected
0x0A00-0x0B03260pal16l8b.8ePAL is read protected
0x0A00-0x0B03260pal16l8b.8ePAL is read protected
0x0C00-0x0D03260pal16l8b.9dPAL is read protected
0x0C00-0x0D03260pal16l8b.9dPAL is read protected
0x0E00-0x0F03260pal16l8b.10cPAL is read protected
0x0E00-0x0F03260pal16l8b.10cPAL is read protected
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048mb7128y.10mCRC(bde780a2),Priority? Unused (Fluke: BA6D)
0x0000-0x07FF2048mb7128y.10mCRC(bde780a2),Priority? Unused (Fluke: BA6D)
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