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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.
Pac-Man (Namco (Midway license), 1980)
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
0x0010OffActive High
0x0000OnActive 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
0x0020Start 1Active Low
0x0040Start 2Active Low
0x0080UprightActive High
0x0000CocktailActive High
0x5040-0x505F32Mirror, Device Write0xaf00, namco, namco_device, pacman_sound_w
0x5060-0x506F16Mirror, Write Only, Shared0xaf00, , spriteram2
0x5070-0x507F16Mirror, Write NOP0xaf00,
0x50801Mirror, Read Port0xaf3f, DSW1
0x0003CoinageActive High
0x00032C_1CActive High
0x00011C_1CActive High
0x00021C_2CActive High
0x0000Free_PlayActive High
0x000cLivesActive High
0x00001Active High
0x00042Active High
0x00083Active High
0x000c5Active High
0x0030Bonus_LifeActive High
0x000010000Active High
0x001015000Active High
0x002020000Active High
0x0030NoneActive High
0x0040DifficultyActive High
0x0040NormalActive High
0x0000HardActive High
0x0080NormalActive High
0x0000AlternateActive High
0x50801Mirror, Write NOP0xaf3f,
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
0x0000-0x0FFF4096pacman.5eCRC(0c944964) (Fluke: E576)
0x1000-0x1FFF4096pacman.5fCRC(958fedf9) (Fluke: 09B3)
0x1000-0x1FFF4096pacman.5fCRC(958fedf9) (Fluke: 09B3)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096pacman.6eCRC(c1e6ab10) (Fluke: 8B1A)
0x1000-0x1FFF4096pacman.6fCRC(1a6fb2d4) (Fluke: 8859)
0x1000-0x1FFF4096pacman.6fCRC(1a6fb2d4) (Fluke: 8859)
0x2000-0x2FFF4096pacman.6hCRC(bcdd1beb) (Fluke: 1934)
0x3000-0x3FFF4096pacman.6jCRC(817d94e3) (Fluke: 0A4B)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF25682s126.1mCRC(a9cc86bf) (Fluke: 71E8)
0x0000-0x00FF25682s126.1mCRC(a9cc86bf) (Fluke: 71E8)
0x0100-0x01FF25682s126.3mCRC(77245b66),timing - not used (Fluke: E0E5)
0x0100-0x01FF25682s126.3mCRC(77245b66),timing - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F3282s123.7fCRC(2fc650bd) (Fluke: C358)
0x0000-0x001F3282s123.7fCRC(2fc650bd) (Fluke: C358)
0x0020-0x011F25682s126.4aCRC(3eb3a8e4) (Fluke: E779)
0x0020-0x011F25682s126.4aCRC(3eb3a8e4) (Fluke: E779)
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