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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.
Thundercade / Twin Formation (Seta (Taito license), 1987)
Memory Area:tndrcade_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM(// ROM)
0x200000-0x2000012Write NOP(// ? 0)
0x280000-0x2800012Write NOP(// ? 0 / 1 (sub cpu related?))
0x300000-0x3000012Write NOP(// ? 0 / 1)
0x380000-0x3803FF1024RAM, Sharedpaletteram (// Palette)
0x600600-0x6006078RAM, Device Read/Writespritegen, seta001_device, spritectrl_r16, spritectrl_w16
0x800000-0x8000078Writesub_ctrl_w (// Sub CPU Control?)
0xA00000-0xA00FFF4096Read/Writesharedram_68000_r,sharedram_68000_w (// Shared RAM)
0xC00000-0xC03FFF16384RAM, Device Read/Writespritegen, seta001_device, spritecode_r16, spritecode_w16 (// Sprites Code + X + Attr)
0xE00000-0xE03FFF16384RAM, Sharedshare1 (// RAM (Mirrored?))
0xFFC000-0xFFFFFF16384RAM, Sharedshare1 (// RAM (Mirrored?))
Memory Area:tndrcade_sub_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM(// RAM)
0x08001Readff_r (// ? (bits 0/1/2/3: 1 -> do test 0-ff/100-1e0/5001-57ff/banked rom))
0x10001Writesub_bankswitch_lockout_w (// ROM Bank + Coin Lockout)
0x10001Read PortP1 (// P1)
0x10011Read PortP2 (// P2)
0x10021Read PortCOINS (// Coins)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010Service 1Active Low
0x0020TiltActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x2000-0x20012Device Read/Writeym1, ym2203_device, read, write
0x3000-0x30012Device Writeym2, ym3812_device, write
0x5000-0x57FF2048RAM, Sharedsharedram (// Shared RAM)
0x6000-0x7FFF8192ROM(// ROM)
0x8000-0xBFFF16384ROM Bankbank1 (// Banked ROM)
0xC000-0xFFFF16384ROM(// ROM)
 

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
0x0000-0x3FFFF262144ua0-10.u12CRC(aa7b6757) (Fluke: E7C5)
0x40000-0x7FFFF262144ua0-11.u13CRC(11eaf931) (Fluke: 5752)
0x80000-0xBFFFF262144ua0-12.u14CRC(00b5381c) (Fluke: 9C4D)
0xC0000-0xFFFFF262144ua0-13.u15CRC(8f9a0ed3) (Fluke: B0C3)
0x100000-0x13FFFF262144ua0-6.u8CRC(14ecc7bb) (Fluke: FB1A)
0x140000-0x17FFFF262144ua0-7.u9CRC(ff1a4e68) (Fluke: 026A)
0x180000-0x1BFFFF262144ua0-8.u10CRC(936e1884) (Fluke: 85C7)
0x1C0000-0x1FFFFF262144ua0-9.u11CRC(e812371c) (Fluke: E46D)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x4000-0x23FFF131072ua10-5.u24CRC(8eff6122) (Fluke: B4FE)
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