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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.
Water Ski (Taito Corporation, 1983)
Memory Area:taitosj_audio_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024RAM
0x4800-0x48012Device Writeay2, ay8910_device, address_data_w
0x48011Device Readay2, ay8910_device, data_r
0x4802-0x48032Device Writeay3, ay8910_device, address_data_w
0x48031Device Readay3, ay8910_device, data_r
0x4804-0x48052Device Writeay4, ay8910_device, address_data_w
0x48051Device Readay4, ay8910_device, data_r
0x50001Read/Writesound_command_r, sound_command_ack_w
0x50011Read/Writesound_status_r, sound_semaphore_clear_w
0xE000-0xEFFF4096ROM(/* space for diagnostic ROM */)
Memory Area:taitosj_main_nomcu_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x7FFF8192ROM Bankbank1
0x8000-0x87FF2048RAM
0x88001Mirror, Read/Write0x07fe, taitosj_fake_data_r, taitosj_fake_data_w
0x88011Mirror, Read0x07fe, taitosj_fake_status_r
0x9000-0xBFFF12288Write, Sharedtaitosj_characterram_w, characterram
0xC000-0xC3FF1024RAM
0xC400-0xC7FF1024RAM, Sharedvideoram_1
0xC800-0xCBFF1024RAM, Sharedvideoram_2
0xCC00-0xCFFF1024RAM, Sharedvideoram_3
0xD000-0xD05F96RAM, Sharedcolscrolly
0xD100-0xD1FF256RAM, Sharedspriteram
0xD200-0xD27F128Mirror, RAM, Shared0x0080, , paletteram
0xD3001Mirror, Write Only, Shared0x00ff, , video_priority
0xD400-0xD4034Mirror, Read Only, Shared0x00f0, , collision_reg
0xD4041Mirror, Read0x00f3, taitosj_gfxrom_r
0xD4081Mirror, Read Port0x00f0, IN0
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010P1 SlowActive Low
0x0020P1 JumpActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xD4091Mirror, Read Port0x00f0, IN1
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xD40A1Mirror, Read Port0x00f0, DSW1 (/* DSW1 */)
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x0004OffActive High
0x0000OnActive High
0x00002:00Active High
0x00082:10Active High
0x00102:20Active High
0x00182:30Active High
0x0020OffActive High
0x0000OnActive High
0x0000OffActive High
0x0040OnActive High
0x0000UprightActive High
0x0080CocktailActive High
0xD40B1Mirror, Read Port0x00f0, IN2
0xD40C1Mirror, Read Port0x00f0, IN3 (/* Service */)
0xD40D1Mirror, Read Port0x00f0, IN4
0x000fUnknownActive Low
0x00f0SpecialActive High
0xD40E-0xD40F2Mirror, Device Write0x00f0, ay1, ay8910_device, address_data_w
0xD40F1Mirror, Device Read0x00f0, ay1, ay8910_device, data_r (/* DSW2 and DSW3 */)
0xD500-0xD5056Mirror, Write Only, Shared0x00f0, , scroll
0xD506-0xD5072Mirror, Write Only, Shared0x00f0, , colorbank
0xD5081Mirror, Write0x00f0, taitosj_collision_reg_clear_w
0xD509-0xD50A2Mirror, Write Only, Shared0x00f0, , gfxpointer
0xD50B1Mirror, Write0x00f0, sound_command_w
0xD50C1Mirror, Write0x00f0, sound_semaphore_w
0xD50D1Mirror, Device Write0x00f0, watchdog, watchdog_timer_device, reset_w
0xD50E1Mirror, Write0x00f0, taitosj_bankswitch_w
0xD50F1Mirror, Write NOP0x00f0,
0xD6001Mirror, Write Only, Shared0x00ff, , video_mode
0xD700-0xDFFF2304Read/Write NOP
0xE000-0xFFFF8192ROM
 

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
0x0000-0x0FFF4096a03-13CRC(78c7d37f) (Fluke: 9B75)
0x1000-0x1FFF4096a03-14CRC(31f991ca) (Fluke: 273E)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096a03-08BAD_DUMP CRC(c206d870) (Fluke: 937F)
0x1000-0x1FFF4096a03-09CRC(48ac912a) (Fluke: 0D89)
0x2000-0x2FFF4096a03-10CRC(a056defb) (Fluke: 3A00)
0x3000-0x3FFF4096a03-11CRC(f06cddd6) (Fluke: 1172)
0x4000-0x4FFF4096a03-12CRC(27dfd8c2) (Fluke: 2B0F)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096a03-01CRC(322c4c2c) (Fluke: EBAF)
0x1000-0x1FFF4096a03-02CRC(8df176d1) (Fluke: 820D)
0x2000-0x2FFF4096a03-03CRC(420bd04f) (Fluke: 5EBE)
0x3000-0x3FFF4096a03-04CRC(5c081a94) (Fluke: 1FA5)
0x4000-0x4FFF4096a03-05CRC(1fae90d2) (Fluke: 5548)
0x5000-0x5FFF4096a03-06CRC(55b7c151) (Fluke: 9F93)
0x6000-0x6FFF4096a03-07CRC(8abc7522) (Fluke: 50C8)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256eb16.22CRC(b833b5ea) (Fluke: A3C5)
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