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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.
Psycho-Nics Oscar (Data East Corporation, 1987)
Memory Area:oscar_map
Address RangeLengthFunctionDescription
0x0000-0x0EFF3840RAM, Sharedshare1
0x0F00-0x0FFF256RAM
0x1000-0x1FFF4096RAM, Sharedshare2
0x2000-0x27FF2048RAM Write, Shareddec8_videoram_w, videoram
0x2800-0x2FFF2048Device Read/Writetilegen1, deco_bac06_device, pf_data_8bit_r, pf_data_8bit_w
0x3000-0x37FF2048RAM, Sharedspriteram (/* Sprites */)
0x3800-0x3BFF1024RAM Device Write, Sharedpalette, palette_device, write, palette
0x3C001Read PortIN0
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 1Active Low
0x3C00-0x3C078Device Writetilegen1, deco_bac06_device, pf_control0_8bit_w
0x3C011Read PortIN1
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 2Active Low
0x3C021Read PortIN2 (/* VBL & coins */)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080CustomActive High
0x3C031Read PortDSW0 (/* Dip 1 */)
0x00031C_2CActive High
0x00021C_3CActive High
0x00011C_4CActive High
0x00001C_6CActive High
0x00004C_1CActive High
0x00043C_1CActive High
0x00082C_1CActive High
0x000c1C_1CActive High
0x0010OffActive High
0x0000OnActive High
0x0000OffActive High
0x0020OnActive High
0x0040OffActive High
0x0000OnActive High
0x0000UprightActive High
0x0080CocktailActive High
0x3C041Read PortDSW1
0x00011Active High
0x00033Active High
0x00025Active High
0x0000Infinite (Cheat)Active High
0x0008EasyActive High
0x000cNormalActive High
0x0004HardActive High
0x0000HardestActive High
0x003040k 100k 60k+Active High
0x002060k 160k 100k+Active High
0x001090k 240k 150k+Active High
0x000050k onlyActive High
0x0040OffActive High
0x0000OnActive High
0x0000NoActive High
0x0080YesActive High
0x3C10-0x3C1F16Device Writetilegen1, deco_bac06_device, pf_control1_8bit_w
0x3C801Writedec8_mxc06_karn_buffer_spriteram_w (/* DMA */)
0x3D001Writedec8_bank_w (/* BNKS */)
0x3D801Writedec8_sound_w (/* SOUN */)
0x3E001Write NOP(/* COINCL */)
0x3E80-0x3E834Writeoscar_int_w
0x4000-0x7FFF16384ROM Bankbank1
0x8000-0xFFFF32768ROM
Memory Area:oscar_s_map
Address RangeLengthFunctionDescription
0x0000-0x05FF1536RAM
0x2000-0x20012Device Writeym1, ym2203_device, write
0x4000-0x40012Device Writeym2, ym3526_device, write
0x60001Device Readsoundlatch, generic_latch_8_device, read
0x8000-0xFFFF32768ROM
Memory Area:oscar_sub_map
Address RangeLengthFunctionDescription
0x0000-0x0EFF3840RAM, Sharedshare1
0x0F00-0x0FFF256RAM
0x1000-0x1FFF4096RAM, Sharedshare2
0x3E80-0x3E834Writeoscar_int_w
0x4000-0xFFFF49152ROM
 

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
0x8000-0xFFFF32768ed12CRC(432031c5) (Fluke: 3E17)
0x8000-0xFFFF32768ed12CRC(432031c5) (Fluke: 3E17)
0x8000-0xFFFF32768ed12CRC(432031c5) (Fluke: 3E17)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384ed08CRC(308ac264) (Fluke: 8BC7)
0x0000-0x3FFF16384ed08CRC(308ac264) (Fluke: 8BC7)
0x0000-0x3FFF16384ed08CRC(308ac264) (Fluke: 8BC7)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536ed04CRC(416a791b) (Fluke: 5050)
0x0000-0xFFFF65536ed04CRC(416a791b) (Fluke: 5050)
0x0000-0xFFFF65536ed04CRC(416a791b) (Fluke: 5050)
0x20000-0x2FFFF65536ed05CRC(fcdba431) (Fluke: 0185)
0x20000-0x2FFFF65536ed05CRC(fcdba431) (Fluke: 0185)
0x20000-0x2FFFF65536ed05CRC(fcdba431) (Fluke: 0185)
0x40000-0x4FFFF65536ed06CRC(7d50bebc) (Fluke: 1932)
0x40000-0x4FFFF65536ed06CRC(7d50bebc) (Fluke: 1932)
0x40000-0x4FFFF65536ed06CRC(7d50bebc) (Fluke: 1932)
0x60000-0x6FFFF65536ed07CRC(8fdf0fa5) (Fluke: E159)
0x60000-0x6FFFF65536ed07CRC(8fdf0fa5) (Fluke: E159)
0x60000-0x6FFFF65536ed07CRC(8fdf0fa5) (Fluke: E159)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536ed01CRC(d3a58e9e) (Fluke: F783)
0x0000-0xFFFF65536ed01CRC(d3a58e9e) (Fluke: F783)
0x0000-0xFFFF65536ed01CRC(d3a58e9e) (Fluke: F783)
0x20000-0x2FFFF65536ed03CRC(4fc4fb0f) (Fluke: D81C)
0x20000-0x2FFFF65536ed03CRC(4fc4fb0f) (Fluke: D81C)
0x20000-0x2FFFF65536ed03CRC(4fc4fb0f) (Fluke: D81C)
0x40000-0x4FFFF65536ed00CRC(ac201f2d) (Fluke: 75DF)
0x40000-0x4FFFF65536ed00CRC(ac201f2d) (Fluke: 75DF)
0x40000-0x4FFFF65536ed00CRC(ac201f2d) (Fluke: 75DF)
0x60000-0x6FFFF65536ed02CRC(7ddc5651) (Fluke: 1634)
0x60000-0x6FFFF65536ed02CRC(7ddc5651) (Fluke: 1634)
0x60000-0x6FFFF65536ed02CRC(7ddc5651) (Fluke: 1634)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536du11CRC(ff45c440) (Fluke: B0C5)
0x0000-0xFFFF65536du11CRC(ff45c440) (Fluke: B0C5)
0x0000-0xFFFF65536du11CRC(ff45c440) (Fluke: B0C5)
0x8000-0xFFFF32768du10CRC(120040d8),Is "DU" code correct for "World" or is (Fluke: 4C2D)
0x10000-0x1FFFF65536ed09CRC(e2d4bba9),this set really the first rev Japan set? (Fluke: 38F5)
0x10000-0x1FFFF65536ed09CRC(e2d4bba9),this set really the first rev Japan set? (Fluke: 38F5)
0x10000-0x1FFFF65536ed09CRC(e2d4bba9),this set really the first rev Japan set? (Fluke: 38F5)
Memory Area:mcu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096id8751h.mcu
0x0000-0x0FFF4096id8751h.mcu
0x0000-0x0FFF4096id8751h.mcu
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