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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.
BeatHead (Atari Games, 1993)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFFF131072RAM, Sharedram_base
0x1800000-0x1BFFFFF4194304ROM, Region, Shareduser1, 0, rom_base
0x40000000-0x400007FF2048RAM Write, Sharedeeprom_data_w, nvram
0x41000000-0x410000034Device Read/Write 8-bitjsa, atari_jsa_iii_device, main_response_r, main_command_w, 0x000000ff
0x41000100-0x4100011F32Writeinterrupt_control_w
0x41000100-0x410001034Readinterrupt_control_r
0x41000200-0x410002034Read PortIN1
0x0001Button 2Active Low
0x0002Button 1Active Low
0x0004UnusedActive Low
0x0008UnusedActive Low
0x0010Joystick RightActive Low
0x0020Joystick LeftActive Low
0x0040Joystick DownActive Low
0x0080Joystick UpActive Low
0xff00UnusedActive Low
0x41000204-0x410002074Read PortIN0
0x00ffUnusedActive Low
0x0100Button 2Active Low
0x0200Button 1Active Low
0x0400UnusedActive Low
0x0800UnusedActive Low
0x1000Joystick RightActive Low
0x2000Joystick LeftActive Low
0x4000Joystick DownActive Low
0x8000Joystick UpActive Low
0x41000208-0x4100020F8Writesound_reset_w
0x41000220-0x410002278Writecoin_count_w
0x41000300-0x410003034Read PortIN2
0x000fUnusedActive Low
0x0010CustomActive Low
0x0020CustomActive Low
0xff80UnusedActive Low
0x41000304-0x410003074Read PortIN3
0x0001Coin 1Active Low
0x0006UnusedActive Low
0x0008Coin 2Active Low
0xfff0UnusedActive Low
0x0003UnusedActive High
0x41000400-0x410004034Write Only, Sharedpalette_select
0x41000500-0x410005034Writeeeprom_enable_w
0x41000600-0x410006034Writefinescroll_w
0x41000700-0x410007034Device Writewatchdog, watchdog_timer_device, reset32_w
0x42000000-0x4201FFFF131072Device Read/Write 16-bit, Sharedpalette, palette_device, read, write, 0x0000ffff, palette
0x43000000-0x430000078Read/Writehsync_ram_r, hsync_ram_w
0x8DF80000-0x8DF800034Read NOP(/* noisy x4 during scanline int */)
0x8F380000-0x8F3FFFFF524288Writevram_latch_w
0x8F900000-0x8F97FFFF524288Writevram_transparent_w
0x8F980000-0x8F9FFFFF524288RAM, Sharedvideoram
0x8FB80000-0x8FBFFFFF524288Writevram_bulk_w
0x8FFF8000-0x8FFF80034Write Only, Sharedvram_bulk_latch
0x9E280000-0x9E2FFFFF524288Writevram_copy_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:jsa:cpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536bhsnd.binCRC(dfd33f02) (Fluke: 9328)
Memory Area:jsa:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072bhpcm0.binCRC(609ca626) (Fluke: 1257)
0x20000-0x3FFFF131072bhpcm1.binCRC(35511509) (Fluke: 6CC3)
0x40000-0x5FFFF131072bhpcm2.binCRC(f71a840a) (Fluke: B3D0)
0x60000-0x7FFFF131072bhpcm3.binCRC(fedd4936) (Fluke: 239A)
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