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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.
Big Bucks (Dynasoft Inc., 1986)
Memory Area:bigbucks_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024RAM Write, Sharedpacman_videoram_w, videoram
0x4400-0x47FF1024RAM Write, Sharedpacman_colorram_w, colorram
0x4C00-0x4FFF1024RAM
0x5000-0x503F64Read PortIN0
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0000OffActive High
0x0010OnActive High
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Service 1Active Low
0x50001Writeirq_mask_w
0x50011Device Writenamco, namco_device, pacman_sound_enable_w
0x50031Writepacman_flipscreen_w
0x50071Write NOP(/*?*/)
0x5040-0x507F64Read PortIN1
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x5040-0x505F32Device Writenamco, namco_device, pacman_sound_w
0x5080-0x50BF64Read PortDSW1
0x000015 sec. / 10 sec.Active High
0x000120 sec. / 15 sec.Active High
0x0000OffActive High
0x0002OnActive High
0x0000OffActive High
0x0004OnActive High
0x0000OffActive High
0x0008OnActive High
0x00002C_1CActive High
0x00101C_1CActive High
0x0020UprightActive High
0x0000CocktailActive High
0x0000OffActive High
0x0040OnActive High
0x0000OffActive High
0x0080OnActive High
0x50C01Device Writewatchdog, watchdog_timer_device, reset_w
0x50C0-0x50FF64Read PortDSW2
0x00ffUnusedActive High
0x51001Write NOP(/*?*/)
0x60001Writebigbucks_bank_w
0x8000-0x9FFF8192ROM
Memory Area:bigbucks_portmap
Address RangeLengthFunctionDescription
0x0000-0xFFFF65536Readbigbucks_question_r
Memory Area:pacman_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384Mirror, ROM0x8000,
0x4000-0x43FF1024Mirror, RAM Write, Shared0xa000, pacman_videoram_w, videoram
0x4400-0x47FF1024Mirror, RAM Write, Shared0xa000, pacman_colorram_w, colorram
0x4800-0x4BFF1024Mirror, Read, Write NOP0xa000, pacman_read_nop,
0x4C00-0x4FEF1008Mirror, RAM0xa000,
0x4FF0-0x4FFF16Mirror, RAM, Shared0xa000, , spriteram
0x50001Mirror, Read Port0xaf3f, IN0
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0000OffActive High
0x0010OnActive High
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Service 1Active Low
0x50001Mirror, Write0xaf38, irq_mask_w
0x50011Mirror, Device Write0xaf38, namco, namco_device, pacman_sound_enable_w
0x50021Mirror, Write NOP0xaf38,
0x50031Mirror, Write0xaf38, pacman_flipscreen_w
0x5004-0x50052Mirror, Write NOP0xaf38, (// AM_WRITE(pacman_leds_w))
0x50061Mirror, Write NOP0xaf38, (// AM_WRITE(pacman_coin_lockout_global_w))
0x50071Mirror, Write0xaf38, pacman_coin_counter_w
0x50401Mirror, Read Port0xaf3f, IN1
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x5040-0x505F32Mirror, Device Write0xaf00, namco, namco_device, pacman_sound_w
0x5060-0x506F16Mirror, Write Only, Shared0xaf00, , spriteram2
0x5070-0x507F16Mirror, Write NOP0xaf00,
0x50801Mirror, Write NOP0xaf3f,
0x50801Mirror, Read Port0xaf3f, DSW1
0x000015 sec. / 10 sec.Active High
0x000120 sec. / 15 sec.Active High
0x0000OffActive High
0x0002OnActive High
0x0000OffActive High
0x0004OnActive High
0x0000OffActive High
0x0008OnActive High
0x00002C_1CActive High
0x00101C_1CActive High
0x0020UprightActive High
0x0000CocktailActive High
0x0000OffActive High
0x0040OnActive High
0x0000OffActive High
0x0080OnActive High
0x50C01Mirror, Device Write0xaf3f, watchdog, watchdog_timer_device, reset_w
0x50C01Mirror, Read Port0xaf3f, DSW2
0x00ffUnusedActive High
Memory Area:writeport
Address RangeLengthFunctionDescription
0x00001Writepacman_interrupt_vector_w (/* Pac-Man only */)
 

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
0x0000-0x0FFF40965e.cpuCRC(18442c37) (Fluke: A803)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384p.romCRC(eea6c1c9) (Fluke: 2C26)
0x8000-0x9FFF8192m.romCRC(bb8f7363) (Fluke: 80B3)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF25682s126.1mCRC(a9cc86bf) (Fluke: 71E8)
0x0100-0x01FF25682s126.3mCRC(77245b66),timing - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F3282s123.7fCRC(2fc650bd) (Fluke: C358)
0x0020-0x011F25682s126.4aCRC(3eb3a8e4) (Fluke: E779)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768rom1.romCRC(90b7785f) (Fluke: 9329)
0x8000-0xFFFF32768rom2.romCRC(60172d77) (Fluke: 504F)
0x10000-0x17FFF32768rom3.romCRC(a2207320) (Fluke: C2A2)
0x18000-0x1FFFF32768rom4.romCRC(5a74c1f9) (Fluke: CDDF)
0x20000-0x27FFF32768rom5.romCRC(93bc1080) (Fluke: AABC)
0x28000-0x2FFFF32768rom6.romCRC(eea2423f) (Fluke: 7796)
0x30000-0x37FFF32768rom7.romCRC(96694055) (Fluke: 1DC9)
0x38000-0x3FFFF32768rom8.romCRC(e68ebf8e) (Fluke: FAF7)
0x40000-0x47FFF32768rom9.romCRC(fd20921d) (Fluke: 1EE2)
0x48000-0x4FFFF32768rom10.romCRC(5091b951) (Fluke: B9FD)
0x50000-0x57FFF32768rom11.romCRC(705128db) (Fluke: AF02)
0x58000-0x5FFFF32768rom12.romCRC(74c776e7) (Fluke: EDB7)
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