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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.
Cannonball (Atari, 1976)
Memory Area:cpu_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024Write, Maskwram_w, 0x7f
0x0000-0x03FF1024Read, Maskwram_r, 0x7f
0x0400-0x07FF1024Write, Sharedvram_w, video_ram
0x0400-0x07FF1024Read Only
0x10011Read Port1001
0x00002 Coins eachActive High
0x00c01 Coin eachActive High
0x00801 Coin 1 GameActive High
0x00401 Coin 2 GamesActive High
0x10031Read Port1003
0x00c03Active High
0x00805Active High
0x00407Active High
0x00009Active High
0x10201Read Port1020
0x0040Start 2Active Low
0x0080Start 1Active Low
0x10401Read Port1040
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0x10601Read Port1060
0x18001Read/Write NOP(/* watchdog? */)
0x1810-0x18112Read/Write NOP
0x1820-0x18212Read/Write NOP
0x1830-0x18312Read/Write NOP
0x1840-0x18412Read/Write NOP
0x1850-0x18512Read/Write NOP
0x1870-0x18712Read/Write NOP
0x2000-0x20012Read/Write NOP
0x28001Read Port2800
0x0001Button 1Active Low
0x0080Button 2Active Low
0x7000-0x7FFF4096ROM
 

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:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256canball.6hCRC(b8094b4c),sync (Fluke: 695B)
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