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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.
Space Combat (bootleg, 1979)
Memory Area:spacecom_io_map
Address RangeLengthFunctionDescription
0x00411Read PortIN0
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x00003Active High
0x00045Active High
0x00002500Active High
0x00081500Active High
0x0010OffActive High
0x0000OnActive High
0x0020Button 1Active High
0x0040Joystick LeftActive High
0x0080Joystick RightActive High
0x00421Read Port, WriteIN1, invaders_audio_1_w
0x0001Coin 1Active High
0x0002Start 2Active High
0x0004Start 1Active High
0x0010UnknownActive High
0x0020Button 1Active High
0x0040Joystick LeftActive High
0x0080Joystick RightActive High
0x00441Read Port, WriteIN2, invaders_audio_2_w
0x0001CustomActive High
0x00feUnknownActive High
Memory Area:spacecom_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x2000-0x3FFF8192RAM, Sharedmain_ram (// other RAM not hooked up?)
 

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
0x0000-0x03FF10241f.ic67BAD_DUMP CRC(703f2cbe)
0x0400-0x07FF10242g.ic82CRC(7269b719)
0x0800-0x0BFF10243f.ic68CRC(6badac4f)
0x0C00-0x0FFF10244g.ic83CRC(75b59ea7)
0x1000-0x13FF10245f.ic69CRC(84b61117)
0x1400-0x17FF10246g.ic84CRC(de383625) (Fluke: 1302)
0x1800-0x1BFF10247f.ic70CRC(5a23dbc8)
0x1C00-0x1FFF10248g.ic85CRC(a5a467e3)
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