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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.
Skelagon (Nichibutsu USA, 1983)
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
0x6000-0x60012Mirror, Write0x07f8, start_lamp_w
0x60021Mirror, Write0x07f8, coin_lock_w
0x60031Mirror, Write0x07f8, coin_count_0_w
0x68001Mirror, Read Port0x07ff, IN1
0x70001Mirror, Read Port0x07ff, IN2
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:sfx_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x4800-0x4BFF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5000-0x50FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x68001Mirror, Write0x07f8, scramble_background_red_w
0x68011Mirror, Write0x07f8, irq_enable_w
0x68021Mirror, Write0x07f8, coin_count_0_w
0x68031Mirror, Write0x07f8, scramble_background_blue_w
0x68041Mirror, Write0x07f8, galaxian_stars_enable_w
0x68051Mirror, Write0x07f8, scramble_background_green_w
0x68061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x68071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x7000-0x7FFF4096ROM
0x8000-0xBFFF16384Read/Writetheend_ppi8255_r, theend_ppi8255_w
0xC000-0xEFFF12288ROM
Memory Area:sfx_sample_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x8000-0x83FF1024Mirror, RAM0x6c00,
Memory Area:sfx_sample_portmap
Address RangeLengthFunctionDescription
0x0000-0x00FF256Read/Writesfx_sample_io_r, sfx_sample_io_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:audio2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF40961.1jCRC(2f172c58) (Fluke: 477F)
0x1000-0x1FFF40962.2jCRC(a6ad2f6b) (Fluke: DF61)
0x2000-0x2FFF40963.3jCRC(fa1274fa) (Fluke: 8A4E)
0x3000-0x3FFF40964.4jCRC(1cd33f3a) (Fluke: 1773)
0x4000-0x4FFF409610.binCRC(2c719de2) (Fluke: 33BD)
0x5000-0x5FFF40968.binCRC(350379dd) (Fluke: 3CAE)
Memory Area:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF40965.5jCRC(59028fb6) (Fluke: A094)
0x1000-0x1FFF40966.6jCRC(5427670f) (Fluke: CCA7)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF409638.binCRC(2fffa8b1) (Fluke: FE1C)
0x1000-0x1FFF409639.binCRC(a854b5de) (Fluke: E6BB)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x1000-0x1FFF409631.binCRC(ae6f8647) (Fluke: 4712)
0x2000-0x2FFF409632.binCRC(a28c5838) (Fluke: 8E76)
0x3000-0x3FFF409633.binCRC(32f7e99c) (Fluke: 3882)
0x7000-0x7FFF409637.binCRC(47f68a31) (Fluke: C809)
0xC000-0xCFFF409624.binCRC(e6d7dc74) (Fluke: 7903)
0xD000-0xDFFF409635.binCRC(5b2a0158) (Fluke: 50BA)
0xE000-0xEFFF409636.binBAD_DUMP CRC(f53ead29) (Fluke: B711)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F326331.9gCRC(ca1d9ccd) (Fluke: E7D8)
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