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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.
Othello (Success, 1984)
Memory Area:audio_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x8000-0x83FF1024RAM
Memory Area:audio_portmap
Address RangeLengthFunctionDescription
0x00001Readlatch_r
0x00011Writeay_data_w
0x00031Writeay_address_w
0x00041Writeack_w
0x00081Writeay_select_w
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x8000-0x97FF6144Read/Write NOP(/* not populated */)
0x9800-0x9FFF2048RAM, Sharedvideoram
0xF000-0xFFFF4096RAM
Memory Area:main_portmap
Address RangeLengthFunctionDescription
0x00081Device Writecrtc, mc6845_device, address_w
0x00091Device Read/Writecrtc, mc6845_device, register_r, register_w
0x00801Read PortINP
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Joystick LeftActive Low
0x0020Joystick RightActive Low
0x0040Joystick DownActive Low
0x0080Joystick UpActive Low
0x00811Read PortSYSTEM
0x0001Button 2Active Low
0x0002Button 1Active Low
0x0004Button 2Active Low
0x0008Button 1Active Low
0x0010Coin 2Active Low
0x0020Start 2Active Low
0x0040Start 1Active Low
0x0080Coin 1Active Low
0x00831Read PortDSW
0x0001CabinetActive High
0x0000UprightActive High
0x0001CocktailActive High
0x0006CoinageActive High
0x00003C_1CActive High
0x00022C_1CActive High
0x00061C_1CActive High
0x00041C_2CActive High
0x0008OffActive High
0x0000OnActive High
0x0010UnusedActive Low
0x00004Active High
0x00206Active High
0x00408Active High
0x006010Active High
0x0080DifficultyActive High
0x0000EasyActive High
0x0080HardActive High
0x00861Writetilebank_w
0x00871Readunk_87_r
0x008A1Writeunk_8a_w
0x008C1Read/Writeunk_8c_r, unk_8c_w
0x008D1Read, Device Writesound_ack_r, soundlatch, generic_latch_8_device, write
0x008F1Writeunk_8f_w
Memory Area:n7751_portmap
Address RangeLengthFunctionDescription
0x00001Readn7751_t1_r
0x00001Device Writen7751_8243, i8243_device, i8243_prog_w
0x00001Writen7751_p2_w
0x00001Readn7751_command_r
0x00001Readn7751_rom_r
0x00001Device Writedac, dac_byte_interface, write
 

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
0x0000-0x1FFF81923.ic32CRC(2bb4f75d) (Fluke: A243)
Memory Area:gfx
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81925.ic40CRC(45fdc1ab) (Fluke: CDF8)
0x2000-0x3FFF81926.ic41CRC(467a731f) (Fluke: 9C13)
0x4000-0x5FFF81927.ic42CRC(a76705f7) (Fluke: 1E95)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81924.ic59CRC(9f82fe14) (Fluke: 4AA1)
Memory Area:n7751
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF10247751.binCRC(6a9534fc) (Fluke: CDEC)
Memory Area:n7751data
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921.ic48CRC(c3807dea) (Fluke: CCF4)
0x2000-0x3FFF81922.ic49CRC(a945f3e7) (Fluke: 87A8)
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