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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.
Ixion (Sega, 1983)
Memory Area:ixion_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
0xC000-0xC0023Mirror, Write0x18f8, zaxxon_coin_enable_w
0xC0011Mirror, Read Port0x18fc, SW01
0xC0021Mirror, Read Port0x18fc, DSW02
0xC003-0xC0042Mirror, Write0x18f8, zaxxon_coin_counter_w
0xC0031Mirror, Read Port0x18fc, DSW03
0xC0061Mirror, Write0x18f8, zaxxon_flipscreen_w
0xC1001Mirror, Read Port0x18ff, SW100
0xE03C1Mirror, Device Read/Write0x1f00, usbsnd, usb_sound_device, status_r, data_w
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
Memory Area:zaxxon_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x6FFF4096RAM
0x8000-0x83FF1024Mirror, RAM Write, Shared0x1c00, zaxxon_videoram_w, videoram
0xA000-0xA0FF256Mirror, RAM, Shared0x1f00, , spriteram
0xC000-0xC0023Mirror, Write0x18f8, zaxxon_coin_enable_w
0xC0001Mirror, Read Port0x18fc, SW00
0xC0011Mirror, Read Port0x18fc, SW01
0xC0021Mirror, Read Port0x18fc, DSW02
0xC0031Mirror, Read Port0x18fc, DSW03
0xC003-0xC0042Mirror, Write0x18f8, zaxxon_coin_counter_w
0xC0061Mirror, Write0x18f8, zaxxon_flipscreen_w
0xC1001Mirror, Read Port0x18ff, SW100
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
0x0000-0x1FFF81921952a.u113CRC(ffb9b03d) (Fluke: 2176)
0x2000-0x3FFF81921951a.u112CRC(db743f1b) (Fluke: F564)
0x4000-0x5FFF81921950a.u111CRC(c2de178a) (Fluke: AD43)
Memory Area:gfx_spr
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921945a.u77CRC(3a3fbfe7) (Fluke: 6DAB)
0x2000-0x3FFF81921946a.u78CRC(f2cb1b53) (Fluke: E541)
0x4000-0x5FFF81921947a.u79CRC(d2421e92) (Fluke: 76EC)
Memory Area:gfx_tx
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF20481939a.u68CRC(c717ddc7) (Fluke: 35EB)
0x0800-0x0FFF20481940a.u69CRC(ec4bb3ad) (Fluke: 55AE)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921937d.u27CRC(f447aac5) (Fluke: D9F7)
0x2000-0x3FFF81921938b.u28CRC(17f48640) (Fluke: AD54)
0x4000-0x4FFF40961955b.u29CRC(78636ec6) (Fluke: C356)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF2561942a.u98CRC(3a8e6f74) (Fluke: 7B4C)
0x0100-0x01FF2561941a.u72CRC(a5d0d97e) (Fluke: 28A4)
Memory Area:tilemap_dat
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921948a.u91CRC(7a7fcbbe) (Fluke: BEE9)
0x2000-0x3FFF81921953a.u90CRC(6b626ea7) (Fluke: B16D)
0x4000-0x5FFF81921949a.u93CRC(e7722d09) (Fluke: E06B)
0x6000-0x7FFF81921954a.u92CRC(a970f5ff) (Fluke: 0282)
Memory Area:usbcpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF20481944a.u51CRC(88215098) (Fluke: CB6F)
0x0800-0x0FFF20481943a.u50CRC(77e5a1f0) (Fluke: 3D57)
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