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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.
Disco No.1 (Data East, 1982)
Memory Area:audio_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024Mirror, RAM, Shared0x1c00, , audio_rambase
0x2000-0x3FFF8192Device Writeay1, ay8910_device, data_w
0x4000-0x5FFF8192Device Writeay1, ay8910_device, address_w
0x6000-0x7FFF8192Device Writeay2, ay8910_device, data_w
0x8000-0x9FFF8192Device Writeay2, ay8910_device, address_w
0xA000-0xBFFF8192Readaudio_command_r
0xC000-0xDFFF8192Writeaudio_nmi_enable_w
0xE000-0xEFFF4096Mirror, ROM0x1000,
Memory Area:btime_map
Address RangeLengthFunctionDescription
0x0000-0x07FF2048RAM, Sharedrambase
0x0C00-0x0C0F16RAM Device Write, Sharedpalette, palette_device, write, palette
0x1000-0x13FF1024RAM, Sharedvideoram
0x1400-0x17FF1024RAM, Sharedcolorram
0x1800-0x1BFF1024Read/Writebtime_mirrorvideoram_r, btime_mirrorvideoram_w
0x1C00-0x1FFF1024Read/Writebtime_mirrorcolorram_r, btime_mirrorcolorram_w
0x40001Read Port, Write NOPP1,
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick UpActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0060UnusedActive High
0x0080Start 1Active High
0x40011Read PortP2
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick UpActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0060UnusedActive High
0x0080Start 2Active High
0x40021Read Port, WriteSYSTEM, btime_video_control_w
0x001fUnusedActive Low
0x0040Coin 1Active High
0x0080Coin 2Active High
0x40031Read Port, WriteDSW1, audio_command_w
0x0003Coin_AActive High
0x00032C_1CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x00021C_3CActive High
0x000cCoin_BActive High
0x000c2C_1CActive High
0x00001C_1CActive High
0x00041C_2CActive High
0x00081C_3CActive High
0x0040UprightActive High
0x0000CocktailActive High
0x0080CabinetActive High
0x0080UprightActive High
0x0000CocktailActive High
0x40041Read Port, WriteDSW2, bnj_scroll1_w
0x0001LivesActive High
0x00003Active High
0x00015Active High
0x0006Bonus_LifeActive High
0x000010000Active High
0x000220000Active High
0x000430000Active High
0x0006NoneActive High
0x00005Active High
0x00088Active High
0x0000SlowActive High
0x0010FastActive High
0x0000AActive High
0x0020BActive High
0x0040CActive High
0x0060DActive High
0x0080EActive High
0x00a0FActive High
0xB000-0xFFFF20480ROM
Memory Area:disco_audio_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x4000-0x4FFF4096Device Writeay1, ay8910_device, data_w
0x5000-0x5FFF4096Device Writeay1, ay8910_device, address_w
0x6000-0x6FFF4096Device Writeay2, ay8910_device, data_w
0x7000-0x7FFF4096Device Writeay2, ay8910_device, address_w
0x8000-0x8FFF4096Device Read, Write NOPsoundlatch, generic_latch_8_device, read, (/* ack ? */)
0xF000-0xFFFF4096ROM
Memory Area:disco_map
Address RangeLengthFunctionDescription
0x0000-0x04FF1280RAM, Sharedrambase
0x2000-0x7FFF24576RAM Write, Shareddeco_charram_w, deco_charram
0x8000-0x83FF1024RAM, Sharedvideoram
0x8400-0x87FF1024RAM, Sharedcolorram
0x8800-0x881F32RAM, Sharedspriteram
0x90001Read PortSYSTEM
0x001fUnusedActive Low
0x0040Coin 1Active High
0x0080Coin 2Active High
0x92001Read PortP1
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick UpActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0060UnusedActive High
0x0080Start 1Active High
0x94001Read PortP2
0x0001Joystick RightActive High
0x0002Joystick LeftActive High
0x0004Joystick UpActive High
0x0008Joystick DownActive High
0x0010Button 1Active High
0x0060UnusedActive High
0x0080Start 2Active High
0x98001Read PortDSW1
0x0003Coin_AActive High
0x00032C_1CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x00021C_3CActive High
0x000cCoin_BActive High
0x000c2C_1CActive High
0x00001C_1CActive High
0x00041C_2CActive High
0x00081C_3CActive High
0x0040UprightActive High
0x0000CocktailActive High
0x0080CabinetActive High
0x0080UprightActive High
0x0000CocktailActive High
0x9A001Read Port, WriteDSW2, audio_command_w
0x0001LivesActive High
0x00003Active High
0x00015Active High
0x0006Bonus_LifeActive High
0x000010000Active High
0x000220000Active High
0x000430000Active High
0x0006NoneActive High
0x00005Active High
0x00088Active High
0x0000SlowActive High
0x0010FastActive High
0x0000AActive High
0x0020BActive High
0x0040CActive High
0x0060DActive High
0x0080EActive High
0x00a0FActive High
0x9C001Read Port, WriteVBLANK, disco_video_control_w
0x007fUnusedActive Low
0x0080CustomActive High
0xA000-0xFFFF24576ROM
 

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
0xF000-0xFFFF4096disco.w6CRC(d81e781e) (Fluke: FDAD)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0xA000-0xAFFF4096disco.w5CRC(b2c87b78) (Fluke: E8E9)
0xB000-0xBFFF4096disco.w4CRC(ad7040ee) (Fluke: 9D8C)
0xC000-0xCFFF4096disco.w3CRC(12fb4f08) (Fluke: 51C1)
0xD000-0xDFFF4096disco.w2CRC(73f6fb2f) (Fluke: 0ADC)
0xE000-0xEFFF4096disco.w1CRC(ee7b536b) (Fluke: 2E81)
0xF000-0xFFFF4096disco.w0CRC(7c26e76b) (Fluke: 3F7D)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32disco.clrCRC(a393f913) (Fluke: 2F6D)
0x0000-0x001F32disco.clrCRC(a393f913) (Fluke: 2F6D)
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