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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.
M-4 (Midway, 1977)
Memory Area:m4_io_map
Address RangeLengthFunctionDescription
0x00001Mirror, Read Port0x04, IN0
0x0001UnusedActive Low
0x0002Joystick UpActive Low
0x0004UnusedActive Low
0x0008Joystick DownActive Low
0x0010P2 TriggerActive Low
0x0020P2 ReloadActive Low
0x0040UnusedActive Low
0x0080UnusedActive Low
0x00011Mirror, Read Port0x04, IN1
0x0001Coin 1Active Low
0x0002Joystick UpActive Low
0x0004Start 1Active Low
0x0008Joystick DownActive Low
0x0010P1 TriggerActive Low
0x0020P1 ReloadActive Low
0x0040Start 2Active Low
0x0080UnusedActive Low
0x00011Writemw8080bw_reversable_shift_count_w
0x00021Device Writemb14241, mb14241_device, shift_data_w
0x00021Mirror, Read Port0x04, IN2
0x0003CoinageActive High
0x00022 Coins per PlayerActive High
0x00032 Coins/1 or 2 PlayersActive High
0x00001 Coin per PlayerActive High
0x00011 Coin/1 or 2 PlayersActive High
0x000cGame_TimeActive High
0x000060 secondsActive High
0x000470 secondsActive High
0x000880 secondsActive High
0x000c90 secondsActive High
0x0020OffActive High
0x0000OnActive High
0x00c070Active High
0x004080Active High
0x0080100Active High
0x0000110Active High
0x00031Mirror, Read0x04, mw8080bw_reversable_shift_result_r
0x00031Writem4_audio_1_w
0x00041Device Writewatchdog, watchdog_timer_device, reset_w
0x00051Writem4_audio_2_w
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM, Write NOP
0x2000-0x3FFF8192Mirror, RAM, Shared0x4000, , main_ram
0x4000-0x5FFF8192ROM, Write NOP
 

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
0x0000-0x07FF2048m4.hCRC(9ee2a0b5) (Fluke: E6A5)
0x0800-0x0FFF2048m4.gCRC(0e84b9cb) (Fluke: 669F)
0x1000-0x17FF2048m4.fCRC(9ded9956) (Fluke: 48F5)
0x1800-0x1FFF2048m4.eCRC(b6983238) (Fluke: 77DF)
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