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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.
Atlantic City Action (Epos Corporation, 1983)
Memory Area:acitya_portmap
Address RangeLengthFunctionDescription
0x0000-0x00FF256Readacitya_decrypt_rom (/* Switch protection logic */)
Memory Area:epos_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384Mirror, ROM Bank0x8000, bank1
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
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Button 3Active Low
0x0008Button 4Active Low
0x0010Service 1Active Low
0x0020Coin 1Active Low
0x0040UnusedActive Low
0x0080UnusedActive 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
0x5040-0x505F32Mirror, Device Write0xaf00, namco, namco_device, pacman_sound_w
0x50401Mirror, Read Port0xaf3f, IN1
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008UnusedActive Low
0x0010Service 1Active Low
0x0020Button 5Active Low
0x0040Button 6Active Low
0x0080UnusedActive Low
0x5060-0x506F16Mirror, Write Only, Shared0xaf00, , spriteram2
0x5070-0x507F16Mirror, Write NOP0xaf00,
0x50801Mirror, Read Port0xaf3f, DSW1
0x0001Demo_SoundsActive High
0x0001OffActive High
0x0000OnActive High
0x001e3Active High
0x001c4Active High
0x001a5Active High
0x00186Active High
0x00167Active High
0x00148Active High
0x00129Active High
0x001010Active High
0x000e11Active High
0x000c12Active High
0x000a13Active High
0x000814Active High
0x000615Active High
0x000416Active High
0x000217Active High
0x000018Active High
0x50801Mirror, Write NOP0xaf3f,
0x50C01Mirror, Read Port0xaf3f, DSW2
0x00ffUnusedActive High
0x50C01Mirror, Device Write0xaf3f, watchdog, watchdog_timer_device, reset_w
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
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Button 3Active Low
0x0008Button 4Active Low
0x0010Service 1Active Low
0x0020Coin 1Active Low
0x0040UnusedActive Low
0x0080UnusedActive 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
0x5040-0x505F32Mirror, Device Write0xaf00, namco, namco_device, pacman_sound_w
0x50401Mirror, Read Port0xaf3f, IN1
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008UnusedActive Low
0x0010Service 1Active Low
0x0020Button 5Active Low
0x0040Button 6Active Low
0x0080UnusedActive Low
0x5060-0x506F16Mirror, Write Only, Shared0xaf00, , spriteram2
0x5070-0x507F16Mirror, Write NOP0xaf00,
0x50801Mirror, Write NOP0xaf3f,
0x50801Mirror, Read Port0xaf3f, DSW1
0x0001Demo_SoundsActive High
0x0001OffActive High
0x0000OnActive High
0x001e3Active High
0x001c4Active High
0x001a5Active High
0x00186Active High
0x00167Active High
0x00148Active High
0x00129Active High
0x001010Active High
0x000e11Active High
0x000c12Active High
0x000a13Active High
0x000814Active High
0x000615Active High
0x000416Active High
0x000217Active High
0x000018Active High
0x50C01Mirror, Read Port0xaf3f, DSW2
0x00ffUnusedActive High
0x50C01Mirror, Device Write0xaf3f, watchdog, watchdog_timer_device, reset_w
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
0x0000-0x0FFF4096aca_5e.binCRC(7f2dd2c9) (Fluke: D5D5)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192aca_u2.binCRC(261c2fdc) (Fluke: 97E1)
0x2000-0x3FFF8192aca_u3.binCRC(05fab4ca) (Fluke: 0335)
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
0x0000-0x001F32aca_7f.binCRC(133bb744) (Fluke: B5EC)
0x0020-0x011F256aca_4a.binCRC(8e29208f) (Fluke: B3F3)
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