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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.
1942 (Capcom, 1984)
Memory Area:c1942_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankbank1
0xC0001Read PortSYSTEM
0x0001Start 1Active Low
0x0002Start 2Active Low
0x000cUnusedActive Low
0x0010Service 1Active Low
0x0020UnusedActive Low
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0xC0011Read PortP1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x00c0UnusedActive Low
0xC0021Read PortP2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x00c0UnusedActive Low
0xC0031Read PortDSWA
0x0007Coin_AActive High
0x00014C_1CActive High
0x00023C_1CActive High
0x00042C_1CActive High
0x00071C_1CActive High
0x00032C_3CActive High
0x00061C_2CActive High
0x00051C_4CActive High
0x0000Free_PlayActive High
0x0008CabinetActive High
0x0000UprightActive High
0x0008CocktailActive High
0x0030Bonus_LifeActive High
0x003020K 80K 80K+Active High
0x002020K 100K 100K+Active High
0x001030K 80K 80K+Active High
0x000030K 100K 100K+Active High
0x00c0LivesActive High
0x00801Active High
0x00402Active High
0x00c03Active High
0x00005Active High
0xC0041Read PortDSWB
0x0007Coin_BActive High
0x00014C_1CActive High
0x00023C_1CActive High
0x00042C_1CActive High
0x00071C_1CActive High
0x00032C_3CActive High
0x00061C_2CActive High
0x00051C_4CActive High
0x0000Free_PlayActive High
0x0010Flip_ScreenActive High
0x0010OffActive High
0x0000OnActive High
0x0060DifficultyActive High
0x0040EasyActive High
0x0060NormalActive High
0x0020DifficultActive High
0x0000Very_DifficultActive High
0x0080OffActive High
0x0000OnActive High
0xC8001Device Writesoundlatch, generic_latch_8_device, write
0xC802-0xC8032Writec1942_scroll_w
0xC8041Writec1942_c804_w
0xC8051Writec1942_palette_bank_w
0xC8061Writec1942_bankswitch_w
0xCC00-0xCC7F128RAM, Sharedspriteram
0xD000-0xD7FF2048RAM Write, Sharedc1942_fgvideoram_w, fg_videoram
0xD800-0xDBFF1024RAM Write, Sharedc1942_bgvideoram_w, bg_videoram
0xE000-0xEFFF4096RAM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x60001Device Readsoundlatch, generic_latch_8_device, read
0x8000-0x80012Device Writeay1, ay8910_device, address_data_w
0xC000-0xC0012Device Writeay2, ay8910_device, address_data_w
 

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:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384sr-01.c11CRC(bd87f06b)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192sr-02.f2CRC(6ebca191),characters
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192sr-08.a1CRC(3884d9eb),tiles
0x2000-0x3FFF8192sr-09.a2CRC(999cf6e0)
0x4000-0x5FFF8192sr-10.a3CRC(8edb273a)
0x6000-0x7FFF8192sr-11.a4CRC(3a2726c3)
0x8000-0x9FFF8192sr-12.a5CRC(1bd3d8bb)
0xA000-0xBFFF8192sr-13.a6CRC(658f02c4)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384sr-14.l1CRC(2528bec6),sprites
0x4000-0x7FFF16384sr-15.l2CRC(f89287aa)
0x8000-0xBFFF16384sr-16.n1CRC(024418f8)
0xC000-0xFFFF16384sr-17.n2CRC(e2c7e489)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384srb-03.m3CRC(d9dafcc3)
0x4000-0x7FFF16384srb-04.m4CRC(da0cf924)
0x10000-0x13FFF16384srb-05.m5CRC(d102911c)
0x14000-0x15FFF8192srb-06.m6CRC(466f8248)
0x18000-0x1BFFF16384srb-07.m7CRC(0d31038c)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256sb-5.e8CRC(93ab8153),red component
0x0100-0x01FF256sb-6.e9CRC(8ab44f7d),green component
0x0200-0x02FF256sb-7.e10CRC(f4ade9a4),blue component
0x0300-0x03FF256sb-0.f1CRC(6047d91b),char lookup table
0x0400-0x04FF256sb-4.d6CRC(4858968d),tile lookup table
0x0500-0x05FF256sb-8.k3CRC(f6fad943),sprite lookup table
0x0600-0x06FF256sb-2.d1CRC(8bb8b3df),tile palette selector? (not used)
0x0700-0x07FF256sb-3.d2CRC(3b0c99af),tile palette selector? (not used)
0x0800-0x08FF256sb-1.k6CRC(712ac508),interrupt timing (not used)
0x0900-0x09FF256sb-9.m11CRC(4921635c),video timing? (not used)
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