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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.
Maze Invaders (Atari, 1981)
Memory Area:centiped_base_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM, Sharedrambase
0x0400-0x07BF960RAM Write, Sharedcentiped_videoram_w, videoram
0x07C0-0x07FF64RAM, Sharedspriteram
0x08001Read PortDSW1
0x000010Active High
0x000112Active High
0x000214Active High
0x000316Active High
0x000cLivesActive High
0x00002Active High
0x00043Active High
0x00084Active High
0x000c5Active High
0x000020000Active High
0x001025000Active High
0x002030000Active High
0x0030NeverActive High
0x00c0DifficultyActive High
0x0000EasiestActive High
0x0040EasyActive High
0x0080HardActive High
0x00c0HarderActive 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
0x0C001Readcentiped_IN0_r
0x0C011Read PortIN1
0x00ffUnknownActive Low
0x0C021Readcentiped_IN2_r
0x0C031Read PortIN3
0x0001P1 ReverseActive Low
0x0002UnusedActive Low
0x0004P2 FireActive Low
0x0008Start 2Active Low
0x0010UnusedActive Low
0x0020UprightActive High
0x0000CocktailActive High
0x0040UnusedActive 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
0x20001Device Writewatchdog, watchdog_timer_device, reset_w
0x2000-0x3FFF8192ROM
Memory Area:centiped_map
Address RangeLengthFunctionDescription
0x1000-0x100F16Device Read/Writepokey, pokey_device, read, write
Memory Area:mazeinv_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x0400-0x040F16Device Read/Writepokey, pokey_device, read, write
0x0800-0x080F16Device Read/Writepokey2, pokey_device, read, write
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
0x1000-0x13BF960RAM Write, Sharedcentiped_videoram_w, videoram
0x13C0-0x13FF64RAM, Sharedspriteram
0x20001Read PortIN0
0x0003LanguageActive High
0x0000EnglishActive High
0x0001GermanActive High
0x0002FrenchActive High
0x0003SpanishActive High
0x00001Active High
0x00402Active High
0x0080CustomActive High
0x20011Read PortIN1
0x00ffUnknownActive Low
0x20101Read PortIN2
0x0001P1 ReverseActive Low
0x0002UnusedActive Low
0x0004P1 FireActive Low
0x0008Start 1Active Low
0x0010TiltActive Low
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Coin 3Active Low
0x20111Read PortIN3
0x0001P1 ReverseActive Low
0x0002UnusedActive Low
0x0004P2 FireActive Low
0x0008Start 2Active Low
0x0010UnusedActive Low
0x0020UprightActive High
0x0000CocktailActive High
0x0040UnusedActive Low
0x20201Readmazeinv_input_r
0x20301Device Readearom, atari_vg_earom_device, read
0x2480-0x249F32Write, Sharedmazeinv_paletteram_w, paletteram
0x2500-0x25023Writecoin_count_w
0x2503-0x25042Writeled_w
0x25051Writeinput_select_w
0x25061Writecentiped_flip_screen_w
0x2580-0x25834Writemazeinv_input_select_w
0x26001Writeirq_ack_w
0x26801Device Writewatchdog, watchdog_timer_device, reset_w
0x27001Device Writeearom, atari_vg_earom_device, ctrl_w
0x2780-0x27BF64Device Writeearom, atari_vg_earom_device, write
0x3000-0x7FFF20480ROM
Memory Area:milliped_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x0400-0x040F16Device Read/Writepokey, pokey_device, read, write
0x0800-0x080F16Device Read/Writepokey2, pokey_device, read, write
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
0x1000-0x13BF960RAM Write, Sharedcentiped_videoram_w, videoram
0x13C0-0x13FF64RAM, Sharedspriteram
0x20001Readcentiped_IN0_r
0x20011Readmilliped_IN1_r
0x20101Readmilliped_IN2_r
0x20111Read PortIN3
0x0001P1 ReverseActive Low
0x0002UnusedActive Low
0x0004P2 FireActive Low
0x0008Start 2Active Low
0x0010UnusedActive Low
0x0020UprightActive High
0x0000CocktailActive High
0x0040UnusedActive Low
0x20301Device Readearom, atari_vg_earom_device, read
0x2480-0x249F32Write, Sharedmilliped_paletteram_w, paletteram
0x2500-0x25023Writecoin_count_w
0x2503-0x25042Writeled_w
0x25051Writeinput_select_w (/* TBEN */)
0x25061Writecentiped_flip_screen_w
0x25071Writecontrol_select_w (/* CNTRLSEL */)
0x26001Writeirq_ack_w
0x26801Device Writewatchdog, watchdog_timer_device, reset_w
0x27001Device Writeearom, atari_vg_earom_device, ctrl_w
0x2780-0x27BF64Device Writeearom, atari_vg_earom_device, write
0x4000-0x7FFF16384ROM
 

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
0x0000-0x07FF2048136011-007.hj6CRC(16e738f4) (Fluke: D4AA)
0x0800-0x0FFF2048136011-006.f6CRC(d4705e4e) (Fluke: F1E1)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x3000-0x3FFF4096136011-005.p1CRC(37129536) (Fluke: 6A0D)
0x4000-0x4FFF4096136011-004.mn1CRC(2d0fbf2f) (Fluke: 3329)
0x5000-0x5FFF4096136011-003.l1CRC(0ff3747c) (Fluke: 5B38)
0x6000-0x6FFF4096136011-002.k1CRC(96478e07) (Fluke: 5963)
0x7000-0x7FFF4096136011-001.hj1CRC(d5c29a01) (Fluke: AFB1)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32136011-009.c11CRC(dcc48de5) (Fluke: 5F69)
0x0020-0x011F256136011-008.c10CRC(6fa3093a) (Fluke: 6F98)
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