Memory Area:proms
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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.
Alien Invaders (Forbes, 0)
Memory Area:alinvade_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM
0x0400-0x0BFF2048RAM, Sharedvideoram
0x0C00-0x0DFF512RAM
0x20001Writesound_w
0x40001Read PortCOIN
0x0010Coin 1Active Low
0x00efUnknownActive Low
0x60001Read PortDSW
0x00002Active High
0x00013Active High
0x00024Active High
0x00035Active High
0x0000OffActive High
0x0004OnActive High
0x00f8UnusedActive High
0x80001Read PortIN0
0x0020Button 1Active High
0x00dfUnknownActive High
0x80011Read PortIN1
0x0020Joystick RightActive High
0x00dfUnknownActive High
0x80021Read PortIN2
0x0020Joystick LeftActive High
0x00dfUnknownActive High
0x80031Read PortIN3
0x0020Start 1Active High
0x00dfUnknownActive High
0x80041Read PortIN4
0x0020Start 2Active High
0x00dfUnknownActive High
0xA0001Write NOP(//??)
0xC000-0xC00F16Mirror, ROM, Region0xff0, , proms,0
0xE000-0xE3FF1024ROM
0xE4001Writesounden_w
0xE8001Read/Writeirqmask_r,irqmask_w (//??)
0xEC00-0xFFFF5120ROM
 

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.   
0xE000-0xE3FF1024alien28.708CRC(de376295)
0xEC00-0xEFFF1024alien29.708CRC(20212977)
0xF000-0xF3FF1024alien30.708CRC(734b691c)
0xF400-0xF7FF1024alien31.708CRC(5a70535c)
0xF800-0xFBFF1024alien32.708CRC(332dd234)
0xFC00-0xFFFF1024alien33.708CRC(e0d57fc7)
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32prom
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