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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.
Mahjong Hourouki Okite (Home Data, 1988)
Memory Area:mrokumei_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384RAM Write, Sharedmrokumei_videoram_w, videoram
0x4000-0x5FFF8192RAM
0x6000-0x6FFF4096RAM(/* work ram */)
0x7000-0x77FF2048RAM(/* hourouki expects this to act as RAM */)
0x78001RAM(/* only used to store the result of the ROM check */)
0x7801-0x78022Readmrokumei_keyboard_r (// also vblank and active page)
0x78031Read PortIN0 (// coin, service)
0x0001Coin 1Active Low
0x0002OffActive High
0x0000OnActive High
0x0004TiltActive Low
0x0008Service 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x78041Read PortDSW1 (// DSW1)
0x0001Demo_SoundsActive High
0x0001OffActive High
0x0000OnActive High
0x000cCoinageActive High
0x00003C_1CActive High
0x00042C_1CActive High
0x000c1C_1CActive High
0x00081C_2CActive High
0x00101000Active High
0x00002000Active High
0x00e0DifficultyActive High
0x00e01 (easiest)Active High
0x00c02Active High
0x00a03Active High
0x00804Active High
0x00605Active High
0x00406Active High
0x00207Active High
0x00008 (hardest)Active High
0x78051Read PortDSW2 (// DSW2)
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x7FF0-0x7FFD14Write Only, Sharedvreg
0x7FFE1Read NOP(// ??? read every vblank, value discarded)
0x8000-0xFFFF32768ROM
0x80001Writemrokumei_blitter_start_w (// in some games also ROM bank switch to access service ROM)
0x80011Writemrokumei_keyboard_select_w
0x80021Writemrokumei_sound_cmd_w
0x80031Device Writesnsnd, sn76489a_device, write
0x80061Writehomedata_blitter_param_w
0x80071Writemrokumei_blitter_bank_w
Memory Area:mrokumei_sound_io_map
Address RangeLengthFunctionDescription
0x0000-0xFFFF65536Readmrokumei_sound_io_r (/* read address is 16-bit */)
0x00401Mirror, Device Write0xff00, dac, dac_byte_interface, write (/* write address is only 8-bit */)
0x007F1Mirror, Device Write0xff00, dac, dac_byte_interface, write (/* write address is only 8-bit */)
Memory Area:mrokumei_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x80801Writemrokumei_sound_bank_w
0xFFFC-0xFFFD2Write NOP(/* stack writes happen here, but there's no RAM */)
 

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
0x0000-0x1FFFF131072a74_a10.11kCRC(2252f3ec) (Fluke: 7C17)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072a74_a03.1gCRC(bf801b74) (Fluke: 57A0)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072a74_a040.binCRC(b7a4ddbd) (Fluke: 97FC)
0x20000-0x3FFFF131072a74_a050.binCRC(c1718d39) (Fluke: 4B17)
0x40000-0x5FFFF131072a74_a041.binCRC(c6a6407d) (Fluke: 5A61)
0x60000-0x7FFFF131072a74_a051.binCRC(74522b81) (Fluke: 6240)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF32768a74_g01.6gCRC(409cc501) (Fluke: 0431)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072a74_a08.13aCRC(dffdd855) (Fluke: 3DE4)
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