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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.
Atlantis (Bally, 1989)
Memory Area:by6803_io
Address RangeLengthFunctionDescription
0x00001Read/Writeport2_r, port2_w (// P20-P24)
0x00001Read/Writeport1_r, port1_w (// P10-P17)
Memory Area:by6803_map
Address RangeLengthFunctionDescription
0x0020-0x00234Device Read/Writepia0, pia6821_device, read, write
0x0040-0x00434Device Read/Writepia1, pia6821_device, read, write
0x1000-0x17FF2048RAM, Sharednvram (// 6116 ram)
0x8000-0xFFFF32768ROM
 

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:maincpu
Address RangeLengthLabel/LocationDescription
0x8000-0xBFFF16384u26_cpu.romCRC(b98491e1)
0xC000-0xFFFF16384u27_cpu.romCRC(8ea2b4db)
Memory Area:sound1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768u4_snd.romCRC(6a48b588)
0x10000-0x17FFF32768u19_snd.romCRC(1387467c)
0x20000-0x27FFF32768u20_snd.romCRC(d5a6a773)
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