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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.
Mermaid (Sanritsu / Rock-Ola, 1982)
Memory Area:mermaid_map
Address RangeLengthFunctionDescription
0x0000-0x9FFF40960ROM
0xC000-0xC7FF2048RAM
0xC800-0xCBFF1024RAM Write, Sharedmermaid_videoram2_w, videoram2
0xD000-0xD3FF1024RAM Write, Sharedmermaid_videoram_w, videoram
0xD800-0xD81F32RAM Write, Sharedmermaid_bg_scroll_w, bg_scrollram
0xD840-0xD85F32RAM Write, Sharedmermaid_fg_scroll_w, fg_scrollram
0xD880-0xD8BF64RAM, Sharedspriteram
0xDC00-0xDFFF1024RAM Write, Sharedmermaid_colorram_w, colorram
0xE000-0xE0012RAM, Shareday8910_enable
0xE0001Read PortDSW
0x0000UprightActive High
0x0001CocktailActive High
0x0000OffActive High
0x0002OnActive High
0x000020kActive High
0x000430kActive High
0x0000NoActive High
0x0008YesActive High
0x00003Active High
0x00104Active High
0x00205Active High
0x00306Active High
0x00c02C_1CActive High
0x00001C_1CActive High
0x00401C_2CActive High
0x00801C_3CActive High
0xE002-0xE0043Write NOP(// ???)
0xE0051Writemermaid_flip_screen_x_w
0xE0061Writemermaid_flip_screen_y_w
0xE0071Writenmi_mask_w
0xE8001Read Port, Write NOPP1, (// ???)
0x0001Joystick UpActive High
0x0002Joystick RightActive High
0x0004Joystick LeftActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0020Start 1Active High
0x0040Start 2Active High
0x0080UnknownActive High
0xE8011Write NOP(// ???)
0xE8021Write NOP(// ???)
0xE8031Write NOP(// ???)
0xE8041Writerougien_gfxbankswitch1_w
0xE8051Writerougien_gfxbankswitch2_w
0xE8071Write NOP(// ???)
0xF0001Read PortP2
0x0001Joystick UpActive High
0x0002Joystick RightActive High
0x0004Joystick LeftActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0020UnknownActive High
0x0040Coin 1Active High
0x0080Coin 2Active High
0xF8001Readmermaid_collision_r
0xF8021Write NOP(// ???)
0xF8061Writemermaid_ay8910_write_port_w
0xF8071Writemermaid_ay8910_control_port_w
 

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
0x0000-0x0FFF4096g960_45.77CRC(1f6b735e) (Fluke: 1009)
0x1000-0x1FFF4096g960_44.76CRC(fd76074e) (Fluke: C393)
0x2000-0x2FFF4096g960_47.79CRC(3b7d4ad0) (Fluke: 0D74)
0x3000-0x3FFF4096g960_46.78CRC(50c117cd) (Fluke: 947A)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096g960_43.26CRC(6f077417) (Fluke: FEAA)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096g960_32.15CRC(8311f090) (Fluke: C753)
0x1000-0x1FFF4096g960_33.16CRC(9f274fc4) (Fluke: 10B5)
0x2000-0x2FFF4096g960_34.17CRC(5f910179) (Fluke: CEE9)
0x3000-0x3FFF4096g960_35.18CRC(db1868a1) (Fluke: AF8E)
0x4000-0x4FFF4096g960_36.19CRC(178a3567) (Fluke: 9593)
0x5000-0x5FFF4096g960_37.20CRC(7d602527) (Fluke: C9F8)
0x6000-0x6FFF4096g960_38.21CRC(bf9f623c) (Fluke: 052A)
0x7000-0x7FFF4096g960_39.22CRC(df0db390) (Fluke: B0F3)
0x8000-0x8FFF4096g960_40.23CRC(fb7aba3f) (Fluke: 2BE8)
0x9000-0x9FFF4096g960_41.24CRC(d022981d) (Fluke: 4FE6)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32col_a.96CRC(ef87bcd6) (Fluke: F3CA)
0x0000-0x0FFF4096g960_42.39CRC(287840bb) (Fluke: 16D8)
0x0020-0x003F32col_b.95CRC(ca48abdd) (Fluke: 5BB0)
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