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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 Kyou Jidai (Sanritsu, 1986)
Memory Area:mjkjidai_io_map
Address RangeLengthFunctionDescription
0x00001Read PortKEYBOARD
0x003fCustomActive High
0x0040TiltActive Low
0x0080Coin 1Active Low
0x00011Read NOP(// ???)
0x0001-0x00022Writekeyboard_select_w
0x00021Read PortIN2
0x000fUnusedActive Low
0x0020OffActive High
0x0000OnActive High
0x00c0UnusedActive Low
0x00101Writemjkjidai_ctrl_w (// rom bank, coin counter, flip screen etc)
0x00111Read PortDSW1
0x0080Flip_ScreenActive High
0x0080OffActive High
0x0000OnActive High
0x0040UnknownActive High
0x0040OffActive High
0x0000OnActive High
0x0020UnknownActive High
0x0020OffActive High
0x0000OnActive High
0x0010UnknownActive High
0x0010OffActive High
0x0000OnActive High
0x0008UnknownActive High
0x0008OffActive High
0x0000OnActive High
0x0004OffActive High
0x0000OnActive High
0x0002UnknownActive High
0x0002OffActive High
0x0000OnActive High
0x0001UnknownActive High
0x0001OffActive High
0x0000OnActive High
0x00121Read PortDSW2
0x0080UnknownActive High
0x0080OffActive High
0x0000OnActive High
0x0040UnknownActive High
0x0040OffActive High
0x0000OnActive High
0x0020UnknownActive High
0x0020OffActive High
0x0000OnActive High
0x0010UnknownActive High
0x0010OffActive High
0x0000OnActive High
0x0008UnknownActive High
0x0008OffActive High
0x0000OnActive High
0x0004UnknownActive High
0x0004OffActive High
0x0000OnActive High
0x0002UnknownActive High
0x0002OffActive High
0x0000OnActive High
0x0001UnknownActive High
0x0001OffActive High
0x0000OnActive High
0x00201Device Writesn1, sn76489_device, write
0x00301Device Writesn2, sn76489_device, write
0x00401Writeadpcm_w
Memory Area:mjkjidai_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankbank1
0xC000-0xCFFF4096RAM
0xD000-0xDFFF4096RAM, Sharednvram (// cleared and initialized on startup if bit 6 of port 00 is 0)
0xE000-0xF7FF6144RAM Write, Sharedmjkjidai_videoram_w, videoram
 

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:adpcm
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768mkj-40.14cCRC(4d8fcc4a) (Fluke: 9357)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768mkj-20.4eCRC(8fc66bce) (Fluke: 8836)
0x8000-0xFFFF32768mkj-21.5eCRC(4dd41a9b) (Fluke: 57AE)
0x10000-0x17FFF32768mkj-22.6eCRC(70ac2bd7) (Fluke: 9DF6)
0x18000-0x1FFFF32768mkj-23.7eCRC(f9313dde) (Fluke: E077)
0x20000-0x27FFF32768mkj-24.8eCRC(aa5130d0) (Fluke: 65F9)
0x28000-0x2FFFF32768mkj-25.9eCRC(c12c3fe0) (Fluke: 4721)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768mkj-00.14gCRC(188a27e9) (Fluke: 3558)
0x8000-0xFFFF32768mkj-01.15gCRC(a6a5e9c7) (Fluke: E5DE)
0x10000-0x17FFF32768mkj-02.16gCRC(fb312927) (Fluke: E94B)
Memory Area:nvram
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096default.nvCRC(eccc0263)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256mkj-60.13aCRC(5dfaba60) (Fluke: 3D40)
0x0100-0x01FF256mkj-61.14aCRC(e9e90d55) (Fluke: FB08)
0x0200-0x02FF256mkj-62.15aCRC(934f1d53) (Fluke: 586E)
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