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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.
R2D Tank (Sigma Enterprises Inc., 1980)
Memory Area:r2dtank_audio_map
Address RangeLengthFunctionDescription
0x0000-0x007F128RAM(/* internal RAM */)
0xD000-0xD0034Device Read/Writepia_audio, pia6821_device, read, write
0x0000OffActive High
0x0001OnActive High
0x0000OffActive High
0x0002OnActive High
0x0000OffActive High
0x0004OnActive High
0x0000OffActive High
0x0008OnActive High
0x0000OffActive High
0x0010OnActive High
0x0000OffActive High
0x0020OnActive High
0x0000OffActive High
0x0040OnActive High
0x0000OffActive High
0x0080OnActive High
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Joystick DownActive Low
0x0020Joystick UpActive Low
0x0040Joystick UpActive Low
0x0080Joystick DownActive Low
0xF0001Read/Writeaudio_command_r, audio_answer_w
0xF800-0xFFFF2048ROM
Memory Area:r2dtank_main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192RAM, Sharedvideoram
0x2000-0x3FFF8192RAM
0x4000-0x5FFF8192RAM, Sharedcolorram
0x6000-0x7FFF8192RAM
0x8000-0x80034Device Read, Writepia_main, pia6821_device, read, pia_comp_w
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0008Button 1Active Low
0x0010Button 1Active Low
0x0020Start 1Active Low
0x0040Start 2Active Low
0x0080SpecialActive High
0x80041Read/Writeaudio_answer_r, audio_command_w
0xB0001Device Writecrtc, mc6845_device, address_w
0xB0011Device Writecrtc, mc6845_device, register_w
0xC000-0xC0078RAM, Sharednvram
0xC800-0xFFFF14336ROM
 

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
0xF800-0xFFFF2048r2d5.7lCRC(c49bed15) (Fluke: EF73)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0xC800-0xCFFF2048r2d1.1cCRC(20606a0f) (Fluke: 97A9)
0xD000-0xDFFF4096r2d2.1aCRC(7561c67f) (Fluke: 3A71)
0xE000-0xEFFF4096r2d3.2cCRC(fc53c538) (Fluke: AB2F)
0xF000-0xFFFF4096r2d4.2aCRC(56636225) (Fluke: EB34)
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