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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.
Nitro Ball (Data East Corporation, 1992)
Memory Area:nitrobal_map
Address RangeLengthFunctionDescription
0x0000-0x1FFFFF2097152ROM
0x200000-0x200FFF4096Mirror, Device Read/Write0x1000, tilegen1, deco16ic_device, pf1_data_r, pf1_data_w
0x202000-0x2027FF2048Mirror, Device Read/Write0x800, tilegen1, deco16ic_device, pf2_data_r, pf2_data_w
0x204000-0x2047FF2048RAM, Sharedpf1_rowscroll
0x206000-0x2067FF2048RAM, Sharedpf2_rowscroll
0x208000-0x2087FF2048Mirror, Device Read/Write0x800, tilegen2, deco16ic_device, pf1_data_r, pf1_data_w
0x20A000-0x20A7FF2048Mirror, Device Read/Write0x800, tilegen2, deco16ic_device, pf2_data_r, pf2_data_w
0x20C000-0x20C7FF2048RAM, Sharedpf3_rowscroll
0x20E000-0x20E7FF2048RAM, Sharedpf4_rowscroll
0x300000-0x30000F16Device Writetilegen1, deco16ic_device, pf_control_w
0x310000-0x31000F16Device Writetilegen2, deco16ic_device, pf_control_w
0x320000-0x3200012Read Port, Device WriteDSW3, deco_common, decocomn_device, priority_w (/* Priority */)
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnusedActive Low
0x0080Coin 3Active Low
0x320002-0x3200032Write NOP(/* ? */)
0x320004-0x3200052Writewizdfire_irq_ack_w (/* VBL IRQ ack */)
0x340000-0x3407FF2048RAM, Sharedspriteram
0x350000-0x3500012Device Writespriteram, buffered_spriteram16_device, write (/* Triggers DMA for spriteram */)
0x360000-0x3607FF2048RAM, Sharedspriteram2
0x370000-0x3700012Device Writespriteram2, buffered_spriteram16_device, write (/* Triggers DMA for spriteram */)
0x380000-0x381FFF8192RAM Device Write, Shareddeco_common, decocomn_device, buffered_palette_w, paletteram
0x390008-0x3900092Device Writedeco_common, decocomn_device, palette_dma_w
0xFEC000-0xFF3FFF32768RAM
0xFF4000-0xFF7FFF16384Read/Write, Sharednb_protection_region_0_146_r,nb_protection_region_0_146_w, prot16ram (/* Protection device */)
0xFF8000-0xFFFFFF32768RAM
Memory Area:rohga_sound_map
Address RangeLengthFunctionDescription
0x0000-0xFFFF65536ROM
0x100000-0x1000012Read/Write NOP
0x110000-0x1100012Device Read/Writeymsnd, ym2151_device,read,write
0x120000-0x1200012Device Read/Writeoki1, okim6295_device, read, write
0x130000-0x1300012Device Read/Writeoki2, okim6295_device, read, write
0x140000-0x1400012Device Readsoundlatch, generic_latch_8_device, read
0x1F0000-0x1F1FFF8192RAM Bankbank8
0x1FEC00-0x1FEC012Device Writeaudiocpu, h6280_device, timer_w
0x1FF400-0x1FF4034Device Writeaudiocpu, h6280_device, irq_status_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:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536jl08.r20CRC(93d93fe1) (Fluke: AA47)
0x0000-0xFFFF65536jl08.r20CRC(93d93fe1) (Fluke: AA47)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mav00.b10CRC(34785d97),Tiles (Fluke: E5B6)
0x0000-0x7FFFF524288mav00.b10CRC(34785d97),Tiles (Fluke: E5B6)
0x80000-0xFFFFF524288mav01.b12CRC(8b531b16) (Fluke: D5CB)
0x80000-0xFFFFF524288mav01.b12CRC(8b531b16) (Fluke: D5CB)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576mav02.b16CRC(20723bf7),Tiles (Fluke: FC7A)
0x0000-0xFFFFF1048576mav02.b16CRC(20723bf7),Tiles (Fluke: FC7A)
0x100000-0x1FFFFF1048576mav03.e16CRC(ef6195f0) (Fluke: 23DF)
0x100000-0x1FFFFF1048576mav03.e16CRC(ef6195f0) (Fluke: 23DF)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mav10.r17CRC(8ad734b0) (Fluke: 9825)
0x0000-0x7FFFF524288mav10.r17CRC(8ad734b0) (Fluke: 9825)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mav11.r19CRC(ef513908) (Fluke: E62C)
0x0000-0x7FFFF524288mav11.r19CRC(ef513908) (Fluke: E62C)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024jn-00.17lCRC(6ac77b84),Priority (unused) (Fluke: B90F)
0x0000-0x03FF1024jn-00.17lCRC(6ac77b84),Priority (unused) (Fluke: B90F)
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