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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.
IPM Invader (IPM, 1979)
Memory Area:m10_main
Address RangeLengthFunctionDescription
0x0000-0x02FF768RAM, Sharedmemory (/* scratch ram */)
0x1000-0x2FFF8192ROM, Sharedrom
0x4000-0x43FF1024RAM, Sharedvideoram
0x4800-0x4BFF1024RAM Write, Sharedm10_colorram_w, colorram (/* foreground colour */)
0x5000-0x53FF1024RAM Write, Sharedm10_chargen_w, chargen (/* background ????? */)
0xA2001Read PortDSW
0x0000NoActive High
0x0004YesActive High
0x00001500Active High
0x00081000Active High
0x00102C_1CActive High
0x00001C_1CActive High
0x0000OffActive High
0x0020OnActive High
0x0000OffActive High
0x0040OnActive High
0x0000OffActive High
0x0080OnActive High
0xA3001Read PortINPUTS
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Button 1Active High
0x0008Button 1Active High
0x0010Joystick RightActive High
0x0020Joystick LeftActive High
0x0040Joystick RightActive High
0x0080Joystick LeftActive High
0xA4001Writem10_ctrl_w (/* line at bottom of screen?, sound, flip screen */)
0xA5001Writem10_a500_w (/* ??? */)
0xA7001Readm10_a700_r
0xFC00-0xFFFF1024ROM(/* for the reset / interrupt vectors */)
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024b9rCRC(56942cab) (Fluke: 9B62)
0x0400-0x07FF1024b10rCRC(be4b8585) (Fluke: C352)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x1000-0x13FF1024b1rCRC(f9a7eb9b) (Fluke: 3689)
0x1400-0x17FF1024b2rCRC(af11c1aa) (Fluke: CF5C)
0x1800-0x1BFF1024b3rCRC(ed49e481) (Fluke: 83DC)
0x1C00-0x1FFF1024b4rCRC(6d5db95b) (Fluke: C386)
0x2000-0x23FF1024b5rCRC(eabba7aa) (Fluke: 2D49)
0x2400-0x27FF1024b6rCRC(3d0e7fa6) (Fluke: 2566)
0x2800-0x2BFF1024b7rCRC(cf04864f) (Fluke: F500)
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