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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.
Break Thru (Data East USA, 1986)
Memory Area:brkthru_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM Write, Sharedbrkthru_fgram_w, fg_videoram
0x0400-0x0BFF2048RAM
0x0C00-0x0FFF1024RAM Write, Sharedbrkthru_bgram_w, videoram
0x1000-0x10FF256RAM, Sharedspriteram
0x1100-0x17FF1792RAM
0x1800-0x18012Writebrkthru_1800_w (/* bg scroll and color, ROM bank selection, flip screen */)
0x18001Read PortP1
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Joystick LeftActive Low
0x0020Joystick RightActive Low
0x0040Start 1Active Low
0x0080Start 2Active Low
0x18011Read PortP2
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Joystick LeftActive Low
0x0020Joystick RightActive Low
0x0040UnknownActive Low
0x0080CustomActive Low
0x18021Read PortDSW1
0x0003Coin_AActive High
0x00002C_1CActive High
0x00031C_1CActive High
0x00021C_2CActive High
0x00011C_3CActive High
0x000cCoin_BActive High
0x00002C_1CActive High
0x000c1C_1CActive High
0x00081C_2CActive High
0x00041C_3CActive High
0x0010SlowActive High
0x0000FastActive High
0x0020SlowActive High
0x0000FastActive High
0x00401 PlayerActive High
0x00002 PlayersActive High
0x0080CabinetActive High
0x0000UprightActive High
0x0080CocktailActive High
0x18021Writebrkthru_soundlatch_w
0x18031Writebrkthru_1803_w (/* NMI enable, + ? */)
0x18031Read PortDSW2/COIN
0x0003LivesActive High
0x00022Active High
0x00033Active High
0x00015Active High
0x000099 (Cheat)Active High
0x000cBonus_LifeActive High
0x000020000 Points OnlyActive High
0x000410000/20000 PointsActive High
0x000c20000/30000 PointsActive High
0x000820000/40000 PointsActive High
0x0010Allow_ContinueActive High
0x0000NoActive High
0x0010YesActive High
0x0020Flip_ScreenActive High
0x0020OffActive High
0x0000OnActive High
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Service 1Active Low
0x2000-0x3FFF8192ROM Bankbank1
0x4000-0xFFFF49152ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192RAM
0x2000-0x20012Device Writeym2, ym3526_device, write
0x40001Device Readsoundlatch, generic_latch_8_device, read
0x6000-0x60012Device Read/Writeym1, ym2203_device, read, write
0x8000-0xFFFF32768ROM
 

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:audiocpu
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF32768brkthru.5CRC(c309435f) (Fluke: 0B70)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192brkthru.12CRC(58c0b29b),characters (Fluke: 58D7)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768brkthru.9CRC(f54e50a7),sprites (Fluke: ABF6)
0x8000-0xFFFF32768brkthru.10CRC(fd156945) (Fluke: 3FF9)
0x10000-0x17FFF32768brkthru.11CRC(c152a99b) (Fluke: 89E3)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x4000-0x7FFF16384brkthru.1CRC(cfb4265f) (Fluke: DACD)
0x8000-0xFFFF32768brkthru.2CRC(fa8246d9) (Fluke: 4540)
0x10000-0x17FFF32768brkthru.4CRC(8cabf252) (Fluke: 8EB5)
0x18000-0x1FFFF32768brkthru.3CRC(2f2c40c2) (Fluke: 4D4B)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256brkthru.13CRC(aae44269),red and green component (Fluke: A037)
0x0100-0x01FF256brkthru.14CRC(f2d4822a),blue component (Fluke: A2C4)
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