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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.
Galaga (Namco, 1981)
Memory Area:galaga_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM, Write NOP(/* the only area different for each CPU */)
0x6800-0x68078Readbosco_dsw_r
0x6800-0x681F32Device Writenamco, namco_device, pacman_sound_w
0x6820-0x68278Writebosco_latch_w (/* misc latches */)
0x68301Device Writewatchdog, watchdog_timer_device, reset_w
0x7000-0x70FF256Device Read/Write06xx, namco_06xx_device, data_r, data_w
0x71001Device Read/Write06xx, namco_06xx_device, ctrl_r, ctrl_w
0x8000-0x87FF2048RAM Write, Sharedgalaga_videoram_w, videoram
0x8800-0x8BFF1024RAM, Sharedgalaga_ram1
0x9000-0x93FF1024RAM, Sharedgalaga_ram2
0x9800-0x9BFF1024RAM, Sharedgalaga_ram3
0xA000-0xA0056Write Only, Sharedstarcontrol
0xA0071Writegalaga_flip_screen_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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gg1_9.4lCRC(58b2f47c) (Fluke: 3AA1)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gg1_11.4dCRC(ad447c80) (Fluke: D53D)
0x1000-0x1FFF4096gg1_10.4fCRC(dd6f1afc) (Fluke: 391C)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gg1_1b.3pCRC(ab036c9f) (Fluke: 5833)
0x1000-0x1FFF4096gg1_2b.3mCRC(d9232240) (Fluke: 48CE)
0x2000-0x2FFF4096gg1_3.2mCRC(753ce503) (Fluke: 73FF)
0x3000-0x3FFF4096gg1_4b.2lCRC(499fcc76) (Fluke: 734F)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256prom-1.1dCRC(7a2815b4) (Fluke: BF07)
0x0000-0x00FF256prom-1.1dCRC(7a2815b4) (Fluke: BF07)
0x0100-0x01FF256prom-2.5cCRC(77245b66),timing - not used (Fluke: E0E5)
0x0100-0x01FF256prom-2.5cCRC(77245b66),timing - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32prom-5.5nCRC(54603c6b),palette (Fluke: 57F4)
0x0000-0x001F32prom-5.5nCRC(54603c6b),palette (Fluke: 57F4)
0x0020-0x011F256prom-4.2nCRC(59b6edab),char lookup table (Fluke: EE47)
0x0020-0x011F256prom-4.2nCRC(59b6edab),char lookup table (Fluke: EE47)
0x0120-0x021F256prom-3.1cCRC(4a04bb6b),sprite lookup table (Fluke: 7499)
0x0120-0x021F256prom-3.1cCRC(4a04bb6b),sprite lookup table (Fluke: 7499)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gg1_5b.3fCRC(bb5caae3) (Fluke: 5CD7)
Memory Area:sub2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gg1_7b.2cCRC(d016686b) (Fluke: 2E38)
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