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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.
Fantastic (Taito do Brasil, 0)
Memory Area:fantastc_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x88031Device Write8910.0, ay8910_device, address_w
0x880B1Device Write8910.0, ay8910_device, data_w
0x880C1Device Write8910.1, ay8910_device, address_w
0x880E1Device Write8910.1, ay8910_device, data_w
0x9000-0x93FF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x9800-0x98FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0xA0001Mirror, Read Port0x07ff, IN0
0x0001OffActive High
0x0000OnActive High
0x0002Coin 1Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0000OffActive High
0x0040OnActive High
0x0080OffActive High
0x0000OnActive High
0xA8001Mirror, Read Port0x07ff, IN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x00001C_1CActive High
0x00402C_1CActive High
0x00003Active High
0x00805Active High
0xB0001Mirror, Read Port0x07ff, IN2
0x0000EasyActive High
0x0001MediumActive High
0x0002HardActive High
0x0003HardestActive High
0x000020000 80000Active High
0x000430000 80000Active High
0x000820000 120000Active High
0x000c30000 120000Active High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0xB0001Mirror, Write0x07f8, irq_enable_w
0xB8001Mirror, Device Read0x07ff, watchdog, watchdog_timer_device, reset_r
0xFFFE1Read/Write NOP(// ?)
Memory Area:galaxian_map_base
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024Mirror, RAM0x0400,
0x5000-0x53FF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5800-0x58FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x60001Mirror, Read Port0x07ff, IN0
0x0001OffActive High
0x0000OnActive High
0x0002Coin 1Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0000OffActive High
0x0040OnActive High
0x0080OffActive High
0x0000OnActive High
0x6000-0x60012Mirror, Write0x07f8, start_lamp_w
0x60021Mirror, Write0x07f8, coin_lock_w
0x60031Mirror, Write0x07f8, coin_count_0_w
0x68001Mirror, Read Port0x07ff, IN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x00001C_1CActive High
0x00402C_1CActive High
0x00003Active High
0x00805Active High
0x70001Mirror, Read Port0x07ff, IN2
0x0000EasyActive High
0x0001MediumActive High
0x0002HardActive High
0x0003HardestActive High
0x000020000 80000Active High
0x000430000 80000Active High
0x000820000 120000Active High
0x000c30000 120000Active High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x70011Mirror, Write0x07f8, irq_enable_w
0x70041Mirror, Write0x07f8, galaxian_stars_enable_w
0x70061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x70071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x78001Mirror, Device Read0x07ff, watchdog, watchdog_timer_device, reset_r
 

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
0x0000-0x0FFF409637CRC(3a54f749)
0x1000-0x1FFF409638CRC(88b71264)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096f1CRC(8019f0b7)
0x1000-0x1FFF4096f2CRC(988a9bc6)
0x2000-0x2FFF4096f3CRC(a3c0cc0b)
0x3000-0x3FFF4096f4CRC(c1361be8)
0x4000-0x4FFF4096f5CRC(6787e93f)
0x5000-0x5FFF4096f6CRC(597029ae)
0x6000-0x6FFF4096f7CRC(8de08d9a)
0x7000-0x7FFF4096f8CRC(489e2fb7)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32prom-74g138CRC(800f5718)
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