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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.
Dambusters (South West Research, 1981)
Memory Area:dambustr_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x80001Writedambustr_bg_color_w
0x80011Writedambustr_bg_split_line_w
0xC000-0xC7FF2048RAM
0xD000-0xD3FF1024RAM Write, Sharedgalaxold_videoram_w, videoram
0xD400-0xD7FF1024Readgalaxold_videoram_r
0xD800-0xD83F64RAM Write, Sharedgalaxold_attributesram_w, attributesram
0xD840-0xD85F32RAM, Sharedspriteram
0xD860-0xD87F32RAM, Sharedbulletsram
0xD880-0xD8FF128RAM
0xE0001Read PortIN0
0x0001Coin 2Active High
0x0002Coin 1Active High
0x0004Start 2Active High
0x0008Start 1Active High
0x0020Initials ResetActive High
0x0080Button 3Active High
0xE002-0xE0032Writegalaxold_coin_counter_w
0xE004-0xE0074Device Writecust, galaxian_sound_device, lfo_freq_w
0xE800-0xEFFF2048Read PortIN1
0x0001Button 2Active High
0x0002Button 1Active High
0x0004Joystick RightActive High
0x0008Joystick LeftActive High
0x0010Joystick DownActive High
0x0020Joystick UpActive High
0x00001Active High
0x00402Active High
0x0080CoinageActive High
0x00801C_1CActive High
0x00001C_2CActive High
0x0080A 1/1 B 1/2Active High
0x0000A 1/2 B 1/6Active High
0xE800-0xE8023Device Writecust, galaxian_sound_device, background_enable_w
0xE8031Writedambustr_noise_enable_w
0xE8041Device Writecust, galaxian_sound_device, fire_enable_w (// probably louder than normal shot)
0xE8051Device Writecust, galaxian_sound_device, fire_enable_w (// normal shot (like Galaxian))
0xE806-0xE8072Device Writecust, galaxian_sound_device, vol_w
0xF000-0xF7FF2048Read PortDSW
0x0003LivesActive High
0x00003Active High
0x00024Active High
0x00015Active High
0x00036Active High
0x0000OffActive High
0x0004OnActive High
0x0008OffActive High
0x0000OnActive High
0x00f0UnusedActive High
0xF0011Writegalaxold_nmi_enable_w
0xF0041Writegalaxold_stars_enable_w
0xF0061Writegalaxold_flip_screen_x_w
0xF0071Writegalaxold_flip_screen_y_w
0xF8001Device Writecust, galaxian_sound_device, pitch_w
0xF800-0xFFFF2048Device Readwatchdog, 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
0x0000-0x0FFF4096db3a.pr3CRC(9e9a9710) (Fluke: 71C2)
0x1000-0x1FFF4096db1a.pr1CRC(4cb964cd) (Fluke: 8D1D)
0x1000-0x1FFF4096db1a.pr1CRC(4cb964cd) (Fluke: 8D1D)
0x2000-0x2FFF4096db4a.pr3CRC(d9d2df33) (Fluke: E468)
0x2000-0x2FFF4096db4a.pr3CRC(d9d2df33) (Fluke: E468)
0x3000-0x3FFF4096db2a.pr2CRC(0a0a6af5) (Fluke: 622A)
0x3000-0x3FFF4096db2a.pr2CRC(0a0a6af5) (Fluke: 622A)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x4000-0x4FFF4096db8a.pr8CRC(fd041ff4) (Fluke: F685)
0x4000-0x4FFF4096db8a.pr8CRC(fd041ff4) (Fluke: F685)
0x5000-0x5FFF4096db6a.pr6CRC(448db54b) (Fluke: B031)
0x6000-0x6FFF4096db7a.pr7CRC(675b1f5e) (Fluke: BA10)
0x6000-0x6FFF4096db7a.pr7CRC(675b1f5e) (Fluke: BA10)
0x7000-0x7FFF4096db5a.pr5CRC(75659ecc) (Fluke: 1153)
0x7000-0x7FFF4096db5a.pr5CRC(75659ecc) (Fluke: 1153)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32mi-7603-5.ic4CRC(f131f92f),near DB5 - DB8 (Fluke: B51D)
0x0000-0x001F32mi-7603-5.ic4CRC(f131f92f),near DB5 - DB8 (Fluke: B51D)
0x0000-0x001F32mi-7603-5.ic4CRC(f131f92f),near DB5 - DB8 (Fluke: B51D)
Memory Area:unk_prom
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32mi-7603-5.ic3CRC(e2a54c47),near DB1 - DB4 (Fluke: C4AB)
0x0000-0x001F32mi-7603-5.ic3CRC(e2a54c47),near DB1 - DB4 (Fluke: C4AB)
0x0000-0x001F32mi-7603-5.ic3CRC(e2a54c47),near DB1 - DB4 (Fluke: C4AB)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096db11a.pr11CRC(427bd3fb) (Fluke: 67AF)
0x1000-0x1FFF4096db9a.pr9CRC(57164563) (Fluke: 18E3)
0x1000-0x1FFF4096db9a.pr9CRC(57164563) (Fluke: 18E3)
0x2000-0x2FFF4096db10a.pr10CRC(075b9c5e) (Fluke: BFDC)
0x2000-0x2FFF4096db10a.pr10CRC(075b9c5e) (Fluke: BFDC)
0x3000-0x3FFF4096db12a.pr12CRC(ed01a68b) (Fluke: C771)
0x3000-0x3FFF4096db12a.pr12CRC(ed01a68b) (Fluke: C771)
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