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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.
Varth: Operation Thunderstorm (bootleg, 1992)
Memory Area:sgyxz_sound_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 */)
Memory Area:varthb_map
Address RangeLengthFunctionDescription
0x0000-0x1FFFFF2097152ROM
0x800000-0x8000012Read PortIN1
0x800006-0x8000072Writecps1_soundlatch_w
0x800018-0x80001F8Readcps1_dsw_r
0x800030-0x8000378Writecps1_coinctrl_w
0x800100-0x80013F64Write, Sharedcps1_cps_a_w, cps_a_regs
0x800140-0x80017F64Read/Write, Sharedcps1_cps_b_r, cps1_cps_b_w, cps_b_regs
0x800188-0x8001892Writevarthb_layer_w
0x900000-0x92FFFF196608RAM Write, Sharedcps1_gfxram_w, gfxram
0x980000-0x98000B12Writedinopic_layer_w
0xFF0000-0xFFFFFF65536RAM, Sharedmainram
 

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
0x0000-0x7FFF327686CRC(7a99446e) (Fluke: 3363)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF2621445CRC(1547e595)
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