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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.
Steel Gunner 2 (Namco, 1991)
Memory Area:c68_default_am
Address RangeLengthFunctionDescription
0x20001Read PortDSW
0x30001Read PortMCUDI0
0x30011Read PortMCUDI1
0x30021Read PortMCUDI2
0x30031Read PortMCUDI3
0x5000-0x57FF2048Read/Write, Shareddpram_byte_r,dpram_byte_w, dpram
0x6000-0x6FFF4096Readack_mcu_vbl_r (// VBL ack)
0x8000-0xFFFF32768ROM, Regionc68, 0
Memory Area:master_sgunner_am
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x100000-0x10FFFF65536RAM BankNAMCOS2_68K_MASTER_RAM
0x180000-0x183FFF16384Read/Write 8-bitnamcos2_68k_eeprom_r,namcos2_68k_eeprom_w,0x00ff
0x1C0000-0x1FFFFF262144Read/Writenamcos2_68k_master_C148_r,namcos2_68k_master_C148_w
Memory Area:slave_sgunner_am
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x100000-0x13FFFF262144RAM BankNAMCOS2_68K_SLAVE_RAM
0x1C0000-0x1FFFFF262144Read/Writenamcos2_68k_slave_C148_r,namcos2_68k_slave_C148_w
Memory Area:sound_default_am
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM Bankbank6 (/* banked */)
0x4000-0x40012Device Read/Writeymsnd, ym2151_device,read,write
0x5000-0x6FFF8192Device Read/Writec140, c140_device, c140_r,c140_w
0x7000-0x77FF2048Read/Write, Shareddpram_byte_r,dpram_byte_w, dpram
0x7800-0x7FFF2048Read/Writedpram_byte_r,dpram_byte_w (/* mirror */)
0x8000-0x9FFF8192RAM
0xA000-0xBFFF8192Write NOP(/* Amplifier enable on 1st write */)
0xC000-0xC0012Writenamcos2_sound_bankselect_w
0xD000-0xFFFF12288ROM
0xD0011Write NOP(/* Watchdog */)
0xE0001Write 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:audiocpu
Address RangeLengthLabel/LocationDescription
0xC000-0xFFFF16384sns_snd0.binCRC(f079cd32) (Fluke: B756)
0xC000-0xFFFF16384sns_snd0.binCRC(f079cd32) (Fluke: B756)
Memory Area:c140
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288sns_voi1.binCRC(219c97f7) (Fluke: 9945)
0x0000-0x1FFF8192sgunner2.nvCRC(57a521c6)
0x0000-0x7FFFF524288sns_voi1.binCRC(219c97f7) (Fluke: 9945)
0x80000-0xFFFFF524288sns_voi2.binCRC(562ec86b) (Fluke: 1534)
0x80000-0xFFFFF524288sns_voi2.binCRC(562ec86b) (Fluke: 1534)
Memory Area:c68
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768sys2_c68.3fCRC(ca64550a) (Fluke: A72A)
0x0000-0x7FFF32768sys2_c68.3fCRC(ca64550a) (Fluke: A72A)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288sns_obj0.binCRC(c762445c) (Fluke: E17D)
0x0000-0x7FFFF524288sns_obj0.binCRC(c762445c) (Fluke: E17D)
0x80000-0xFFFFF524288sns_obj4.binCRC(0b1be894) (Fluke: F0A1)
0x80000-0xFFFFF524288sns_obj4.binCRC(0b1be894) (Fluke: F0A1)
0x100000-0x17FFFF524288sns_obj1.binCRC(e9e379d8) (Fluke: EE22)
0x100000-0x17FFFF524288sns_obj1.binCRC(e9e379d8) (Fluke: EE22)
0x180000-0x1FFFFF524288sns_obj5.binCRC(416b14e1) (Fluke: 0F7E)
0x180000-0x1FFFFF524288sns_obj5.binCRC(416b14e1) (Fluke: 0F7E)
0x200000-0x27FFFF524288sns_obj2.binCRC(0d076f6c) (Fluke: EE1F)
0x200000-0x27FFFF524288sns_obj2.binCRC(0d076f6c) (Fluke: EE1F)
0x280000-0x2FFFFF524288sns_obj6.binCRC(c2e94ed2) (Fluke: 49A0)
0x280000-0x2FFFFF524288sns_obj6.binCRC(c2e94ed2) (Fluke: 49A0)
0x300000-0x37FFFF524288sns_obj3.binCRC(0fb01e8b) (Fluke: 812D)
0x300000-0x37FFFF524288sns_obj3.binCRC(0fb01e8b) (Fluke: 812D)
0x380000-0x3FFFFF524288sns_obj7.binCRC(fc1f26af) (Fluke: A50D)
0x380000-0x3FFFFF524288sns_obj7.binCRC(fc1f26af) (Fluke: A50D)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288sns_chr0.binCRC(cdc42b61) (Fluke: 8E12)
0x0000-0x7FFFF524288sns_chr0.binCRC(cdc42b61) (Fluke: 8E12)
0x80000-0xFFFFF524288sns_chr1.binCRC(42d4cbb7) (Fluke: EF59)
0x80000-0xFFFFF524288sns_chr1.binCRC(42d4cbb7) (Fluke: EF59)
0x100000-0x17FFFF524288sns_chr2.binCRC(7dbaa14e) (Fluke: 5E37)
0x100000-0x17FFFF524288sns_chr2.binCRC(7dbaa14e) (Fluke: 5E37)
0x180000-0x1FFFFF524288sns_chr3.binCRC(b562ff72) (Fluke: E5A1)
0x180000-0x1FFFFF524288sns_chr3.binCRC(b562ff72) (Fluke: E5A1)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288sns_sha0.binCRC(0374fd67) (Fluke: E0FD)
0x0000-0x7FFFF524288sns_sha0.binCRC(0374fd67) (Fluke: E0FD)
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