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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.
Space Train (Celv, 1981)
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
0x0001Coin 1Active High
0x0002UnusedActive High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020UnusedActive High
0x0040UnusedActive High
0x0080Joystick UpActive 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
0x0004Joystick DownActive High
0x0008UnusedActive High
0x0010UnusedActive High
0x0020UnusedActive High
0x00402C_1CActive High
0x00001C_1CActive High
0x00802C / 1C (duplicateActive High
0x00c0Free_PlayActive High
0x70001Mirror, Read Port0x07ff, IN2
0x00001Active High
0x00012Active High
0x00023Active High
0x00034Active High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x00f0UnusedActive 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
Memory Area:spactrai_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512ROM
0x0200-0x05FF1024RAM(// this sits over ROM, does the 0x400 bytes of ROM underneath bank or appear elsewhere?)
0x0600-0x11FF3072ROM
0x1200-0x15FF1024RAM, RAM Write, Sharedgalaxian_videoram_w, videoram (// see above comment)
0x1600-0x4FFF14848ROM
0x60001Read PortIN0
0x0001Coin 1Active High
0x0002UnusedActive High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020UnusedActive High
0x0040UnusedActive High
0x0080Joystick UpActive High
0x6004-0x60074Mirror, Device Write0x07f8, cust, galaxian_sound_device, lfo_freq_w
0x68001Read PortIN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Joystick DownActive High
0x0008UnusedActive High
0x0010UnusedActive High
0x0020UnusedActive High
0x00402C_1CActive High
0x00001C_1CActive High
0x00802C / 1C (duplicateActive High
0x00c0Free_PlayActive High
0x6800-0x68078Mirror, Device Write0x07f8, cust, galaxian_sound_device, sound_w
0x70001Read PortIN2
0x00001Active High
0x00012Active High
0x00023Active High
0x00034Active High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x00f0UnusedActive 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 Write0x07ff, cust, galaxian_sound_device, pitch_w
0x78001Device Readwatchdog, watchdog_timer_device, reset_r
0xFE00-0xFEFF256RAM, RAM Write, Sharedgalaxian_objram_w, spriteram
 

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
0x0000-0x07FF20486cen.binCRC(a59a9f3f)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF40961cen.binCRC(fabc7fd8)
0x1000-0x1FFF40962cen.binCRC(44ddacfa)
0x2000-0x2FFF40963cen.binCRC(822749cb)
0x3000-0x3FFF40964cen.binCRC(f9dda0ed)
0x4000-0x4FFF40965cen.binCRC(b8c76675)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32stk.binCRC(6a0c7d87) (Fluke: 9DB9)
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