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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.
Heavy Unit -U.S.A. Version- (Kaneko / Taito, 1988)
Memory Area:master_io
Address RangeLengthFunctionDescription
0x00001Writemaster_bankswitch_w
0x00011Writemaster_bankswitch_w (// correct?)
0x00021Writetrigger_nmi_on_slave_cpu
Memory Area:master_memory
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankmaster_bank
0xC000-0xCFFF4096Device Read/Writepandora, kaneko_pandora_device, spriteram_r, spriteram_w
0xD000-0xDFFF4096RAM
0xE000-0xFFFF8192RAM, Sharedshare1
Memory Area:mcu_io
Address RangeLengthFunctionDescription
0x00001Read/Writemermaid_p3_r, mermaid_p3_w
0x00001Read/Writemermaid_p1_r, mermaid_p1_w
0x00001Read/Writemermaid_p2_r, mermaid_p2_w
0x00001Read/Writemermaid_p0_r, mermaid_p0_w
Memory Area:slave_io
Address RangeLengthFunctionDescription
0x00001Writeslave_bankswitch_w
0x00021Writetrigger_nmi_on_sound_cpu2
0x00041Read/Writemermaid_data_r, mermaid_data_w
0x00061Writehu_scrolly_w
0x00081Writehu_scrollx_w
0x000C1Readmermaid_status_r
0x000E1Writecoin_count_w
Memory Area:slave_memory
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankslave_bank
0xC000-0xC3FF1024RAM Write, Sharedhu_videoram_w, videoram
0xC400-0xC7FF1024RAM Write, Sharedhu_colorram_w, colorram
0xD000-0xD1FF512RAM Device Write, Sharedpalette, palette_device, write_ext, palette_ext
0xD000-0xDFFF4096RAM
0xD800-0xD9FF512RAM Device Write, Sharedpalette, palette_device, write, palette
0xE000-0xFFFF8192RAM, Sharedshare1
Memory Area:sound_io
Address RangeLengthFunctionDescription
0x00001Writesound_bankswitch_w
0x0002-0x00032Device Read/Writeymsnd, ym2203_device, read, write
0x00041Device Readsoundlatch, generic_latch_8_device, read
Memory Area:sound_memory
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Banksound_bank
0xC000-0xC7FF2048RAM
 

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
0x0000-0x7FFFF524288b73_08.2fCRC(f83dd808) (Fluke: C31C)
0x100000-0x11FFFF131072b73_28.2cCRC(a02e08d6)
0x120000-0x13FFFF131072b73_27.2bCRC(8708f97c)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288b73_09.2pCRC(537c647f) (Fluke: DF76)
Memory Area:master
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072b73_34.5cCRC(05c30a90)
Memory Area:mermaid
Address RangeLengthLabel/LocationDescription
0x0000-0x0DFF3584mermaid.binCRC(88c5dd27)
Memory Area:slave
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536b73_35.6pCRC(aed1669d)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536b73_12.7eCRC(d1d24fab) (Fluke: D404)
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