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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.
Centipede (Atari, 1980)
Memory Area:centiped_base_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM, Sharedrambase
0x0400-0x07BF960RAM Write, Sharedcentiped_videoram_w, videoram
0x07C0-0x07FF64RAM, Sharedspriteram
0x08001Read PortDSW1
0x0003LanguageActive High
0x0000EnglishActive High
0x0001GermanActive High
0x0002FrenchActive High
0x0003SpanishActive High
0x000cLivesActive High
0x00002Active High
0x00043Active High
0x00084Active High
0x000c5Active High
0x0030Bonus_LifeActive High
0x000010000Active High
0x001012000Active High
0x002015000Active High
0x003020000Active High
0x0040DifficultyActive High
0x0040EasyActive High
0x0000HardActive High
0x00001Active High
0x00802Active High
0x08011Read PortDSW2
0x0003CoinageActive High
0x00032C_1CActive High
0x00021C_1CActive High
0x00011C_2CActive High
0x0000Free_PlayActive High
0x0000*1Active High
0x0004*4Active High
0x0008*5Active High
0x000c*6Active High
0x0000*1Active High
0x0010*2Active High
0x0000NoneActive High
0x00203 credits/2 coinsActive High
0x00405 credits/4 coinsActive High
0x00606 credits/4 coinsActive High
0x00806 credits/5 coinsActive High
0x00a04 credits/3 coinsActive High
0x0C001Readcentiped_IN0_r
0x0C011Read PortIN1
0x0001Start 1Active Low
0x0002Start 2Active Low
0x0004Button 1Active Low
0x0008Button 1Active Low
0x0010TiltActive Low
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Service 1Active Low
0x0C021Readcentiped_IN2_r
0x0C031Read PortIN3
0x0001Joystick DownActive Low
0x0002Joystick UpActive Low
0x0004Joystick RightActive Low
0x0008Joystick LeftActive Low
0x0010Joystick UpActive Low
0x0020Joystick DownActive Low
0x0040Joystick LeftActive Low
0x0080Joystick RightActive Low
0x1400-0x140F16Write, Sharedcentiped_paletteram_w, paletteram
0x1600-0x163F64Device Writeearom,atari_vg_earom_device, write
0x16801Device Writeearom, atari_vg_earom_device, ctrl_w
0x1700-0x173F64Device Readearom, atari_vg_earom_device, read
0x18001Writeirq_ack_w
0x1C00-0x1C023Writecoin_count_w
0x1C03-0x1C042Writeled_w
0x1C071Writecentiped_flip_screen_w
0x2000-0x3FFF8192ROM
0x20001Device Writewatchdog, watchdog_timer_device, reset_w
Memory Area:centiped_map
Address RangeLengthFunctionDescription
0x1000-0x100F16Device Read/Writepokey, pokey_device, read, write
 

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
0x0000-0x07FF2048136001-211.f7CRC(880acfb9) (Fluke: A7C3)
0x0000-0x07FF2048136001-211.f7CRC(880acfb9) (Fluke: A7C3)
0x0000-0x07FF2048136001-211.f7CRC(880acfb9) (Fluke: A7C3)
0x0800-0x0FFF2048136001-212.hj7CRC(b1397029) (Fluke: 31D8)
0x0800-0x0FFF2048136001-212.hj7CRC(b1397029) (Fluke: 31D8)
0x0800-0x0FFF2048136001-212.hj7CRC(b1397029) (Fluke: 31D8)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x2000-0x27FF2048136001-407.d1CRC(c4d995eb) (Fluke: B5ED)
0x2800-0x2FFF2048136001-408.e1CRC(bcdebe1b) (Fluke: EEDD)
0x3000-0x37FF2048136001-409.fh1CRC(66d7b04a) (Fluke: 6283)
0x3800-0x3FFF2048136001-410.j1CRC(33ce4640) (Fluke: CC96)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256136001-213.p4CRC(6fa3093a) (Fluke: 6F98)
0x0000-0x00FF256136001-213.p4CRC(6fa3093a) (Fluke: 6F98)
0x0000-0x00FF256136001-213.p4CRC(6fa3093a) (Fluke: 6F98)
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