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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.
S.S. Mission (Comad, 1992)
Memory Area:ssmissin_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0xB0000-0xBFFFF65536RAM, Sharedmainram
0xC0000-0xC00012Read PortIN0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004UnknownActive Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xC0004-0xC00052Read PortIN1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x0100Joystick RightActive Low
0x0200Joystick LeftActive Low
0x0400Joystick DownActive Low
0x0800Joystick UpActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000UnknownActive Low
0x8000UnknownActive Low
0xC0006-0xC00072Read PortDSW1
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0002UnusedActive High
0x0002OffActive High
0x0000OnActive High
0x000cDifficultyActive High
0x0004EasyActive High
0x000cNormalActive High
0x0008HardActive High
0x0000HardestActive High
0x0010UnusedActive High
0x0010OffActive High
0x0000OnActive High
0x0020UnusedActive High
0x0020OffActive High
0x0000OnActive High
0x00c0LivesActive High
0x00001Active High
0x00402Active High
0x00c03Active High
0x00804Active High
0x0100UnusedActive High
0x0100OffActive High
0x0000OnActive High
0x0200Demo_SoundsActive High
0x0000OffActive High
0x0200OnActive High
0x1c00Coin_BActive High
0x04004C_1CActive High
0x14003C_1CActive High
0x0c002C_1CActive High
0x1c001C_1CActive High
0x18001C_2CActive High
0x08001C_3CActive High
0x10001C_4CActive High
0x0000Free_PlayActive High
0x0400UnusedActive High
0x0400OffActive High
0x0000OnActive High
0x0800UnusedActive High
0x0800OffActive High
0x0000OnActive High
0x1000UnusedActive High
0x1000OffActive High
0x0000OnActive High
0xe000CoinageActive High
0x20004C_1CActive High
0xa0003C_1CActive High
0x60002C_1CActive High
0xe0001C_1CActive High
0xc0001C_2CActive High
0x40001C_3CActive High
0x80001C_4CActive High
0x0000Free_PlayActive High
0xC0014-0xC00152Writenmk_flipscreen_w (/* Maybe */)
0xC0018-0xC00192Writenmk_tilebank_w (/* Tile Bank ? */)
0xC001E-0xC001F2Writessmissin_sound_w
0xC4000-0xC40078RAM Writenmk_scroll_w
0xC8000-0xC87FF2048RAM Device Write, Sharedpalette, palette_device, write, palette
0xCC000-0xCFFFF16384RAM Write, Sharednmk_bgvideoram0_w, nmk_bgvideoram0
0xD0000-0xD07FF2048Mirror, RAM Write, Shared0x1800, nmk_txvideoram_w, nmk_txvideoram (//mirror for airattck)
Memory Area:ssmissin_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x90001Writessmissin_soundbank_w
0x98001Device Read/Writeoki1, okim6295_device, read, write
0xA0001Device Readsoundlatch, generic_latch_8_device, read
 

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
0x0000-0x7FFF32768ssm11.188CRC(8be6dce3) (Fluke: 8C99)
Memory Area:bgtile
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288ssm17.147CRC(c9c28455),16x16 tiles (Fluke: 11A8)
0x80000-0xFFFFF524288ssm18.148CRC(ebfdaad6),16x16 tiles (Fluke: 04D1)
Memory Area:fgtile
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072ssm16.172CRC(5cf6eb1f),8x8 tiles (Fluke: 9415)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072ssm13.190CRC(618f66f0) (Fluke: 7F0D)
0x80000-0xFFFFF524288ssm12.189CRC(e8219c83),banked (Fluke: A96F)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256ssm-pr2.113CRC(cfdbb86c),unknown (Fluke: B5C4)
0x0100-0x02FF512ssm-pr1.114CRC(ed0bd072),unknown (Fluke: 672F)
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