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.
Memory Area:yard_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x8000-0x8FFF4096RAM Write, Sharedvideoram_w, videoram
0x9000-0x9FFF4096Writescroll_panel_w
0xA0001RAM, Sharedscroll_x_low
0xA2001RAM, Sharedscroll_x_high
0xA4001RAM, Sharedscroll_y_low
0xA8001RAM, Sharedscore_disable
0xC820-0xC87F96RAM, Sharedspriteram
0xD0001Read PortIN0
0xD0001Device Writeirem_audio, irem_audio_device, cmd_w
0xD0011Writeflipscreen_w (/* + coin counters */)
0xD0011Read PortIN1
0xD0021Read PortIN2
0xD0031Read PortDSW1
0xD0041Read PortDSW2
0xE000-0xEFFF4096RAM
 

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
0x0000-0x1FFF8192"yf-a-3e-h.3e"CRC(5fba9074),chars // this rom changes to give the '85 text
0x2000-0x3FFF8192"yf-a-3c-h.3c"CRC(f48eedca)
0x4000-0x5FFF8192"yf-a-3d-h.3d"CRC(7d1b4d93)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192"yf-b-5b.5b"CRC(1299ae30),sprites
0x0000-0x00FF256"yf-a-5c.5c"CRC(08fa5103),chars palette low 4 bits
0x0100-0x01FF256"yf-a-5d.5d"CRC(7c04994c),chars palette high 4 bits
0x0220-0x031F256"yf-b-3l.3l"CRC(e1cdfb06),sprites lookup table
0x0320-0x041F256"yf-b-2r.2r"CRC(cd85b646),radar palette low 4 bits
0x0420-0x051F256"yf-b-2p.2p"CRC(45384397),radar palette high 4 bits
0x2000-0x3FFF8192"yf-b-5c.5c"CRC(8708b888)
0x4000-0x5FFF8192"yf-b-5f.5f"CRC(d9bb8ab8)
0x6000-0x7FFF8192"yf-b-5e.5e"CRC(47077e8d)
0x8000-0x9FFF8192"yf-b-5j.5j"CRC(713ef31f)
0xA000-0xBFFF8192"yf-b-5k.5k"CRC(f49651cc)
Memory Area:irem_audio:iremsound
Address RangeLengthLabel/LocationDescription
0x8000-0x9FFF8192"yf-s-3b.3b"CRC(0392a60c)
0xA000-0xBFFF8192"yf-s-1b.1b"CRC(6588f41a)
0xC000-0xDFFF8192"yf-s-3a.3a"CRC(bd054e44)
0xE000-0xFFFF8192"yf-s-1a.1a"CRC(2490d4c3)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192"yf-a-3p-h.3p"CRC(c83da5e3)
0x2000-0x3FFF8192"yf-a-3n-h.3n"CRC(8dc5f32f)
0x4000-0x5FFF8192"yf-a-3m-h.3m"CRC(7d5d0c20)
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