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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.
Zaxxon (Sega, 1982)
Memory Area:zaxxon_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x6FFF4096RAM
0x8000-0x83FF1024Mirror, RAM Write, Shared0x1c00, zaxxon_videoram_w, videoram
0xA000-0xA0FF256Mirror, RAM, Shared0x1f00, , spriteram
0xC0001Mirror, Read Port0x18fc, SW00
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick DownActive High
0x0008Joystick UpActive High
0x0010Button 1Active High
0x00e0UnusedActive High
0xC000-0xC0023Mirror, Write0x18f8, zaxxon_coin_enable_w
0xC0011Mirror, Read Port0x18fc, SW01
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick UpActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x00e0UnusedActive High
0xC0021Mirror, Read Port0x18fc, DSW02
0x0003Bonus_LifeActive High
0x000310000Active High
0x000120000Active High
0x000230000Active High
0x000040000Active High
0x0004UnusedActive High
0x0000OffActive High
0x0004OnActive High
0x0008UnusedActive High
0x0000OffActive High
0x0008OnActive High
0x0030LivesActive High
0x00303Active High
0x00104Active High
0x00205Active High
0x0000Free_PlayActive High
0x0000OffActive High
0x0040OnActive High
0x0080CabinetActive High
0x0000UprightActive High
0x0080CocktailActive High
0xC0031Mirror, Read Port0x18fc, DSW03
0x00062C/1C 5C/3C 6C/4CActive High
0x000a2C/1C 3C/2C 4C/3CActive High
0x00021C/1C 5C/6CActive High
0x000c1C/1C 4C/5CActive High
0x00041C/1C 2C/3CActive High
0x00081C/2C 5C/11CActive High
0x00001C/2C 4C/9CActive High
0x00602C/1C 5C/3C 6C/4CActive High
0x00a02C/1C 3C/2C 4C/3CActive High
0x00201C/1C 5C/6CActive High
0x00c01C/1C 4C/5CActive High
0x00401C/1C 2C/3CActive High
0x00801C/2C 5C/11CActive High
0x00001C/2C 4C/9CActive High
0xC003-0xC0042Mirror, Write0x18f8, zaxxon_coin_counter_w
0xC0061Mirror, Write0x18f8, zaxxon_flipscreen_w
0xC1001Mirror, Read Port0x18ff, SW100
0x0003UnusedActive High
0x0004Start 1Active High
0x0008Start 2Active High
0x0010UnusedActive High
0x0020SpecialActive High
0x0040SpecialActive High
0x0080SpecialActive High
0xE03C-0xE03F4Mirror, Device Read/Write0x1f00, ppi8255, i8255_device, read, write
0xE0F01Mirror, Write0x1f00, int_enable_w
0xE0F11Mirror, Write0x1f00, zaxxon_fg_color_w
0xE0F8-0xE0F92Mirror, Write0x1f00, zaxxon_bg_position_w
0xE0FA1Mirror, Write0x1f00, zaxxon_bg_color_w
0xE0FB1Mirror, Write0x1f00, zaxxon_bg_enable_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:gfx_bg
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zaxxon_rom6.u113CRC(6e07bb68) (Fluke: 51F4)
0x0000-0x1FFF8192zaxxon_rom6.u113CRC(6e07bb68) (Fluke: 51F4)
0x0000-0x1FFF8192zaxxon_rom6.u113CRC(6e07bb68) (Fluke: 51F4)
0x2000-0x3FFF8192zaxxon_rom5.u112CRC(0a5bce6a) (Fluke: 6E40)
0x2000-0x3FFF8192zaxxon_rom5.u112CRC(0a5bce6a) (Fluke: 6E40)
0x2000-0x3FFF8192zaxxon_rom5.u112CRC(0a5bce6a) (Fluke: 6E40)
0x4000-0x5FFF8192zaxxon_rom4.u111CRC(a5bf1465) (Fluke: D462)
0x4000-0x5FFF8192zaxxon_rom4.u111CRC(a5bf1465) (Fluke: D462)
0x4000-0x5FFF8192zaxxon_rom4.u111CRC(a5bf1465) (Fluke: D462)
Memory Area:gfx_spr
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zaxxon_rom11.u77CRC(eaf0dd4b) (Fluke: 5F4C)
0x0000-0x1FFF8192zaxxon_rom11.u77CRC(eaf0dd4b) (Fluke: 5F4C)
0x0000-0x1FFF8192zaxxon_rom11.u77CRC(eaf0dd4b) (Fluke: 5F4C)
0x2000-0x3FFF8192zaxxon_rom12.u78CRC(1c5369c7) (Fluke: 974F)
0x2000-0x3FFF8192zaxxon_rom12.u78CRC(1c5369c7) (Fluke: 974F)
0x2000-0x3FFF8192zaxxon_rom12.u78CRC(1c5369c7) (Fluke: 974F)
0x4000-0x5FFF8192zaxxon_rom13.u79CRC(ab4e8a9a) (Fluke: 487C)
0x4000-0x5FFF8192zaxxon_rom13.u79CRC(ab4e8a9a) (Fluke: 487C)
0x4000-0x5FFF8192zaxxon_rom13.u79CRC(ab4e8a9a) (Fluke: 487C)
Memory Area:gfx_tx
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048zaxxon_rom14.u68CRC(07bf8c52) (Fluke: 2EF9)
0x0000-0x07FF2048zaxxon_rom14.u68CRC(07bf8c52) (Fluke: 2EF9)
0x0000-0x07FF2048zaxxon_rom14.u68CRC(07bf8c52) (Fluke: 2EF9)
0x0800-0x0FFF2048zaxxon_rom15.u69CRC(c215edcb) (Fluke: 26B9)
0x0800-0x0FFF2048zaxxon_rom15.u69CRC(c215edcb) (Fluke: 26B9)
0x0800-0x0FFF2048zaxxon_rom15.u69CRC(c215edcb) (Fluke: 26B9)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zaxxon_rom3d.u27CRC(6e2b4a30),These 3 roms had a red D stamped on them (Fluke: 60A1)
0x2000-0x3FFF8192zaxxon_rom2d.u28CRC(1c9ea398) (Fluke: 8FC3)
0x4000-0x4FFF4096zaxxon_rom1d.u29CRC(1c123ef9) (Fluke: BCB7)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256mro16.u76CRC(6cc6695b),BPROM from TI stamped as J214A2 MRO16 (Fluke: 44A7)
0x0000-0x00FF256mro16.u76CRC(6cc6695b),BPROM from TI stamped as J214A2 MRO16 (Fluke: 44A7)
0x0000-0x00FF256mro16.u76CRC(6cc6695b),BPROM from TI stamped as J214A2 MRO16 (Fluke: 44A7)
0x0000-0x00FF256mro16.u76CRC(6cc6695b),BPROM from TI stamped as J214A2 MRO16 (Fluke: 44A7)
0x0100-0x01FF256zaxxon.u72CRC(deaa21f7),Same data as PR-5167 from Super Zaxxon (Fluke: 59DF)
Memory Area:tilemap_dat
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zaxxon_rom8.u91CRC(28d65063) (Fluke: F81E)
0x0000-0x1FFF8192zaxxon_rom8.u91CRC(28d65063) (Fluke: F81E)
0x0000-0x1FFF8192zaxxon_rom8.u91CRC(28d65063) (Fluke: F81E)
0x2000-0x3FFF8192zaxxon_rom7.u90CRC(6284c200) (Fluke: 19EF)
0x2000-0x3FFF8192zaxxon_rom7.u90CRC(6284c200) (Fluke: 19EF)
0x2000-0x3FFF8192zaxxon_rom7.u90CRC(6284c200) (Fluke: 19EF)
0x4000-0x5FFF8192zaxxon_rom10.u93CRC(a95e61fd) (Fluke: B1C6)
0x4000-0x5FFF8192zaxxon_rom10.u93CRC(a95e61fd) (Fluke: B1C6)
0x4000-0x5FFF8192zaxxon_rom10.u93CRC(a95e61fd) (Fluke: B1C6)
0x6000-0x7FFF8192zaxxon_rom9.u92CRC(7e42691f) (Fluke: A633)
0x6000-0x7FFF8192zaxxon_rom9.u92CRC(7e42691f) (Fluke: A633)
0x6000-0x7FFF8192zaxxon_rom9.u92CRC(7e42691f) (Fluke: A633)
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