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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.
1941: Counter Attack (Capcom, 1990)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFFF4194304ROM
0x800000-0x8000078Read PortIN1 (/* Player input ports */)
0x800018-0x80001F8Readcps1_dsw_r (/* System input ports / Dip Switches */)
0x800020-0x8000212Read NOP(/* ? Used by Rockman ? not mapped according to PAL */)
0x800030-0x8000378Writecps1_coinctrl_w
0x800100-0x80013F64Write, Sharedcps1_cps_a_w, cps_a_regs (/* CPS-A custom */)
0x800140-0x80017F64Read/Write, Sharedcps1_cps_b_r, cps1_cps_b_w, cps_b_regs
0x800180-0x8001878Writecps1_soundlatch_w (/* Sound command */)
0x800188-0x80018F8Writecps1_soundlatch2_w (/* Sound timer fade */)
0x900000-0x92FFFF196608RAM Write, Sharedcps1_gfxram_w, gfxram (/* SF2CE executes code from here */)
0xFF0000-0xFFFFFF65536RAM, Sharedmainram
Memory Area:sub_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankbank1
0xD000-0xD7FF2048RAM
0xF000-0xF0012Device Read/Write2151, ym2151_device, read, write
0xF0021Device Read/Writeoki, okim6295_device, read, write
0xF0041Writecps1_snd_bankswitch_w
0xF0061Writecps1_oki_pin7_w (/* controls pin 7 of OKI chip */)
0xF0081Device Readsoundlatch, generic_latch_8_device, read (/* Sound command */)
0xF00A1Device Readsoundlatch2, generic_latch_8_device, read (/* Sound timer fade */)
 

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:aboardplds
Address RangeLengthLabel/LocationDescription
0x0000-0x0116279prg1CRC(f1129744) (Fluke: 7D9F)
0x0000-0x0116279sou1CRC(84f4b2fe) (Fluke: BF89)
0x0000-0x0116279buf1CRC(eb122de7) (Fluke: 88BC)
0x0000-0x0116279ioa1CRC(59c7ee3b) (Fluke: 0D9E)
0x0000-0x0116279buf1CRC(eb122de7) (Fluke: 88BC)
0x0000-0x0116279ioa1CRC(59c7ee3b) (Fluke: 0D9E)
0x0000-0x0116279prg1CRC(f1129744) (Fluke: 7D9F)
0x0000-0x0116279ioa1CRC(59c7ee3b) (Fluke: 0D9E)
0x0000-0x0116279sou1CRC(84f4b2fe) (Fluke: BF89)
0x0000-0x0116279sou1CRC(84f4b2fe) (Fluke: BF89)
0x0000-0x0116279ioa1CRC(59c7ee3b) (Fluke: 0D9E)
0x0000-0x0116279sou1CRC(84f4b2fe) (Fluke: BF89)
0x0000-0x0116279rom1CRC(41dc73b9) (Fluke: 221B)
0x0000-0x0116279rom1CRC(41dc73b9) (Fluke: 221B)
0x0000-0x0116279prg1CRC(f1129744) (Fluke: 7D9F)
0x0000-0x0116279rom1CRC(41dc73b9) (Fluke: 221B)
0x0000-0x0116279rom1CRC(41dc73b9) (Fluke: 221B)
0x0000-0x0116279prg1CRC(f1129744) (Fluke: 7D9F)
0x0000-0x0116279buf1CRC(eb122de7) (Fluke: 88BC)
0x0000-0x0116279buf1CRC(eb122de7) (Fluke: 88BC)
Memory Area:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF3276841_9.12bCRC(0f9d8527) (Fluke: 7594)
0x0000-0x7FFF3276841_9.12bCRC(0f9d8527) (Fluke: 7594)
0x0000-0x7FFF3276841_9.12bCRC(0f9d8527) (Fluke: 7594)
Memory Area:bboardplds
Address RangeLengthLabel/LocationDescription
0x0000-0x0116279yi24b.1aCRC(3004dcdf)
0x0000-0x0116279iob1.11eCRC(3abc0700) (Fluke: 876D)
0x0000-0x0116279iob1.11eCRC(3abc0700) (Fluke: 876D)
0x0000-0x0116279yi24b.1aCRC(3004dcdf)
0x0000-0x0116279yi24b.1aCRC(3004dcdf)
0x0000-0x0116279iob1.11eCRC(3abc0700) (Fluke: 876D)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF13107241_18.11cCRC(d1f15aeb) (Fluke: 2879)
0x0000-0x1FFFF13107241_18.11cCRC(d1f15aeb) (Fluke: 2879)
0x20000-0x3FFFF13107241_19.12cCRC(15aec3a6) (Fluke: A9E5)
0x20000-0x3FFFF13107241_19.12cCRC(15aec3a6) (Fluke: A9E5)
0x20000-0x3FFFF13107241_19.12cCRC(15aec3a6) (Fluke: A9E5)
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