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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.
301/Bullseye (Grand Products, 1986)
Memory Area:by35_map
Address RangeLengthFunctionDescription
0x0000-0x007F128RAM
0x0088-0x008B4Device Read/Writepia_u10, pia6821_device, read, write
0x0090-0x00934Device Read/Writepia_u11, pia6821_device, read, write
0x0200-0x02FF256RAM, Read/Write, Sharednibble_nvram_r, nibble_nvram_w, nvram
0x1000-0x7FFF28672ROM(// AM_REGION("roms", 0 ))
 

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:cpu2
Address RangeLengthLabel/LocationDescription
0x8000-0x87FF2048bull.sndCRC(c0482a2f)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x2000-0x2FFF4096bull.u2CRC(a2951aa2)
0x3000-0x3FFF4096bull.u6CRC(64d4b9c4)
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