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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.
Twin Adventure (Barko Corp., 1995)
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
Memory Area:twinadv_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x100000-0x10FFFF65536RAM
0x200000-0x2000012Device Writewatchdog, watchdog_timer_device, reset16_w
0x300000-0x3000012Read/Writesnowbros_68000_sound_r,twinadv_68000_sound_w
0x400000-0x4000012Writesnowbros_flipscreen_w
0x500000-0x5000012Read PortDSW1
0x00003C_1CActive High
0x00012C_1CActive High
0x00031C_1CActive High
0x00021C_2CActive High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0000OffActive High
0x0010OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000CustomActive High
0x500002-0x5000032Read PortDSW2
0x0003NormalActive High
0x0002HardActive High
0x0001HarderActive High
0x0000HardestActive High
0x00043Active High
0x00005Active High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000UnknownActive High
0x500004-0x5000052Read PortSYSTEM
0x0100Start 1Active Low
0x0200Start 2Active Low
0x0400Coin 1Active Low
0x0800Coin 2Active Low
0x1000UnknownActive Low
0x2000TiltActive Low
0x4000Coin 3Active Low
0x8000UnknownActive Low
0x600000-0x6001FF512RAM Device Write, Sharedpalette, palette_device, write, palette
0x700000-0x701FFF8192RAM, Sharedspriteram16b
0x800000-0x8000012Writesnowbros_irq4_ack_w (/* IRQ 4 acknowledge */)
0x900000-0x9000012Writesnowbros_irq3_ack_w (/* IRQ 3 acknowledge */)
0xA00000-0xA000012Writesnowbros_irq2_ack_w (/* IRQ 2 acknowledge */)
Memory Area:twinadv_sound_io_map
Address RangeLengthFunctionDescription
0x00021Device Read/Writesoundlatch, generic_latch_8_device, read, write (// back to 68k?)
0x00041Writetwinadv_oki_bank_w (// oki bank?)
0x00061Device Read/Writeoki, okim6295_device, read, write
 

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
0x0000-0x7FFFF52428816.ua4CRC(f491e171) (Fluke: 0598)
0x80000-0xFFFFF52428815.ua5CRC(79a08b8d) (Fluke: 6EFC)
0x100000-0x17FFFF52428814.ua6CRC(79faee0b) (Fluke: 6395)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144sra.binCRC(82f452c4) (Fluke: 3483)
0x0000-0x3FFFF262144sra.binCRC(82f452c4) (Fluke: 3483)
0x40000-0x7FFFF262144srb.binCRC(109e51e6) (Fluke: 8570)
0x40000-0x7FFFF262144srb.binCRC(109e51e6) (Fluke: 8570)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768uh15.binCRC(3d5acd08) (Fluke: 5CC7)
0x0000-0x7FFF32768uh15.binCRC(3d5acd08) (Fluke: 5CC7)
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