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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.
Marvin's Maze (SNK, 1983)
Memory Area:marvins_cpuA_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x60001Writemarvins_palette_bank_w
0x80001Read PortIN0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020UnknownActive Low
0x0040SpecialActive High
0x0080UnknownActive Low
0x81001Read PortIN1
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x82001Read PortIN2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x83001Writemarvins_soundlatch_w
0x84001Read PortDSW1
0x0003LivesActive High
0x00001Active High
0x00012Active High
0x00023Active High
0x00035Active High
0x0004OffActive High
0x0000OnActive High
0x0038CoinageActive High
0x00385C_1CActive High
0x00303C_1CActive High
0x00282C_1CActive High
0x00001C_1CActive High
0x00081C_2CActive High
0x00101C_3CActive High
0x00181C_5CActive High
0x00201C_6CActive High
0x0040Free_PlayActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x85001Read PortDSW2
0x000010000Active High
0x000120000Active High
0x000230000Active High
0x000340000Active High
0x000450000Active High
0x000560000Active High
0x000670000Active High
0x000780000Active High
0x00081st bonus*2Active High
0x00101st bonus*3Active High
0x00181st bonus*4Active High
0x0000NoneActive High
0x0020Demo_SoundsActive High
0x0000OffActive High
0x0020OnActive High
0x0040CabinetActive High
0x0000UprightActive High
0x0040CocktailActive High
0x0080Flip_ScreenActive High
0x0080OffActive High
0x0000OnActive High
0x86001Writemarvins_flipscreen_w
0x87001Read/Writesnk_cpuB_nmi_trigger_r, snk_cpuA_nmi_ack_w
0xC000-0xCFFF4096RAM, Sharedspriteram (// + work ram)
0xD000-0xD7FF2048RAM Write, Sharedmarvins_fg_videoram_w, fg_videoram
0xD800-0xDFFF2048RAM, Sharedshare3
0xE000-0xE7FF2048RAM Write, Sharedmarvins_bg_videoram_w, bg_videoram
0xE800-0xEFFF2048RAM, Sharedshare5
0xF000-0xF7FF2048RAM Write, Sharedsnk_tx_videoram_w, tx_videoram (// + work RAM)
0xF8001Writesnk_sp16_scrolly_w
0xF9001Writesnk_sp16_scrollx_w
0xFA001Writesnk_fg_scrolly_w
0xFB001Writesnk_fg_scrollx_w
0xFC001Writesnk_bg_scrolly_w
0xFD001Writesnk_bg_scrollx_w
0xFE001Writesnk_sprite_split_point_w
0xFF001Writemarvins_scroll_msb_w
Memory Area:marvins_cpuB_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x87001Read/Writesnk_cpuA_nmi_trigger_r, snk_cpuB_nmi_ack_w
0xC000-0xCFFF4096RAM, Sharedspriteram
0xD000-0xD7FF2048RAM Write, Sharedmarvins_fg_videoram_w, fg_videoram
0xD800-0xDFFF2048RAM, Sharedshare3
0xE000-0xE7FF2048RAM Write, Sharedmarvins_bg_videoram_w, bg_videoram
0xE800-0xEFFF2048RAM, Sharedshare5
0xF000-0xF7FF2048RAM Write, Sharedsnk_tx_videoram_w, tx_videoram
0xF8001Writesnk_sp16_scrolly_w
0xF9001Writesnk_sp16_scrollx_w
0xFA001Writesnk_fg_scrolly_w
0xFB001Writesnk_fg_scrollx_w
0xFC001Writesnk_bg_scrolly_w
0xFD001Writesnk_bg_scrollx_w
0xFE001Writesnk_sprite_split_point_w
0xFF001Writemarvins_scroll_msb_w
Memory Area:marvins_sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x40001Readmarvins_soundlatch_r
0x8000-0x80012Device Writeay1, ay8910_device, address_data_w
0x8002-0x80076Device Writewave, snkwave_device, snkwave_w
0x8008-0x80092Device Writeay2, ay8910_device, address_data_w
0xA0001Readmarvins_sound_nmi_ack_r
0xE000-0xE7FF2048RAM
Memory Area:marvins_sound_portmap
Address RangeLengthFunctionDescription
0x00001Read NOP(// read on startup, then the Z80 automatically pulls down the IORQ pin to ack irq)
 

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
0x0000-0x1FFF8192m1CRC(2314c696) (Fluke: 9426)
0x2000-0x3FFF8192m2CRC(74ba5799) (Fluke: C03A)
Memory Area:bg_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192b2CRC(e528bc60) (Fluke: 082E)
Memory Area:fg_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192b1CRC(e528bc60) (Fluke: 082E)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192pa1CRC(0008d791) (Fluke: 1039)
0x2000-0x3FFF8192pa2CRC(9457003c) (Fluke: 01CC)
0x4000-0x5FFF8192pa3CRC(54c33ecb) (Fluke: 14BC)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024marvmaze.j1CRC(92f5b06d) (Fluke: CB15)
0x0400-0x07FF1024marvmaze.j2CRC(d2b25665) (Fluke: B1B4)
0x0800-0x0BFF1024marvmaze.j3CRC(df9e6005) (Fluke: 2D49)
Memory Area:sp16_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192f1CRC(0bd6b4e5) (Fluke: BA36)
0x2000-0x3FFF8192f2CRC(8fc2b081) (Fluke: 95A2)
0x4000-0x5FFF8192f3CRC(e55c9b83) (Fluke: 860A)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192pb1CRC(3b6941a5) (Fluke: 383B)
Memory Area:tx_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192s1CRC(327f70f3) (Fluke: 7221)
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