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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.
Joust (Williams, 1982)
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x007F128RAM(/* internal RAM */)
0x0080-0x00FF128RAM(/* MC6810 RAM */)
0x0400-0x04034Mirror, Device Read/Write0x8000, pia_2, pia6821_device, read, write
0xB000-0xFFFF20480ROM
Memory Area:williams_map
Address RangeLengthFunctionDescription
0x0000-0x8FFF36864Read Bank, Write Only, Sharedbank1, , videoram
0x9000-0xBFFF12288RAM
0xC000-0xC00F16Mirror, Write Only, Shared0x03f0, , paletteram
0xC804-0xC8074Mirror, Device Read/Write0x00f0, pia_0, pia6821_device, read, write
0xC80C-0xC80F4Mirror, Device Read/Write0x00f0, pia_1, pia6821_device, read, write
0xC900-0xC9FF256Writewilliams_vram_select_w
0xCA00-0xCA078Mirror, Write0x00f8, williams_blitter_w
0xCB00-0xCBFF256Readwilliams_video_counter_r
0xCBFF1Writewilliams_watchdog_reset_w
0xCC00-0xCFFF1024RAM Write, Sharedwilliams_cmos_w, nvram
0xD000-0xFFFF12288ROM
 

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:maincpu
Address RangeLengthLabel/LocationDescription
0xD000-0xDFFF40963006-22.10bCRC(3f1c4f89) (Fluke: 4CAA)
0xE000-0xEFFF40963006-23.11bCRC(ea48b359) (Fluke: E5D6)
0xF000-0xFFFF40963006-24.12bCRC(c710717b) (Fluke: 9996)
0x10000-0x10FFF40963006-13.1bCRC(fe41b2af) (Fluke: 3754)
0x11000-0x11FFF40963006-14.2bCRC(501c143c) (Fluke: 12DC)
0x12000-0x12FFF40963006-15.3bCRC(43f7161d) (Fluke: 9461)
0x13000-0x13FFF40963006-16.4bCRC(db5571b6) (Fluke: 9004)
0x14000-0x14FFF40963006-17.5bCRC(c686bb6b) (Fluke: 55E6)
0x15000-0x15FFF40963006-18.6bCRC(fac5f2cf) (Fluke: 0559)
0x16000-0x16FFF40963006-19.7bCRC(81418240) (Fluke: 076F)
0x17000-0x17FFF40963006-20.8bCRC(ba5359ba) (Fluke: FDE9)
0x18000-0x18FFF40963006-21.9bCRC(39643147) (Fluke: C5C5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF512decoder.4CRC(e6631c23) (Fluke: 5702)
0x0000-0x01FF512decoder.4CRC(e6631c23) (Fluke: 5702)
0x0000-0x01FF512decoder.4CRC(e6631c23) (Fluke: 5702)
0x0200-0x03FF512decoder.6CRC(83faf25e) (Fluke: B999)
0x0200-0x03FF512decoder.6CRC(83faf25e) (Fluke: B999)
0x0200-0x03FF512decoder.6CRC(83faf25e) (Fluke: B999)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0xF000-0xFFFF4096joust.sndCRC(f1835bdd) (Fluke: 0A28)
0xF000-0xFFFF4096joust.sndCRC(f1835bdd) (Fluke: 0A28)
0xF000-0xFFFF4096joust.sndCRC(f1835bdd) (Fluke: 0A28)
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