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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.
Halley's Comet (Taito America Corporation (Coin-It license), 1986)
Memory Area:halleys_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096Read/Write, Sharedblitter_r, blitter_w, blitter_ram
0x1000-0xEFFF57344ROM
0x1F00-0x1FFF256Writebgtile_w (// background tiles?(Ben Bero Beh only))
0xF000-0xFEFF3840RAM(// work ram)
0xFF00-0xFFBF192RAM, Sharedio_ram (// I/O write fall-through)
0xFF661Readcollision_id_r (// HACK: collision detection bypass(Halley's Comet only))
0xFF711Readblitter_status_r
0xFF80-0xFF834Readio_mirror_r
0xFF8A1Writesoundcommand_w
0xFF901Read PortIN0 (// coin/start)
0x0001UnknownActive High
0x0002UnknownActive High
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010TiltActive Low
0x0020Service 1Active Low
0x0040Coin 2Active High
0x0080Coin 1Active High
0xFF911Read PortIN1 (// player 1)
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040Button 2Active Low
0x0080Button 1Active Low
0xFF921Read PortIN2 (// player 2)
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040Button 2Active Low
0x0080Button 1Active Low
0xFF931Read PortIN3 (// unused?)
0xFF941Readcoin_lockout_r
0xFF951Read PortDSW1 (// dipswitch 4)
0xFF961Read PortDSW2 (// dipswitch 3)
0x000cBonus_LifeActive High
0x0000100k 600k 500k+Active High
0x000c200k 800k 600k+Active High
0x0008200k 1000k 800k+Active High
0x0004200k 1200k 1000k+Active High
0x0030LivesActive High
0x00202Active High
0x00303Active High
0x00104Active High
0x00004 (No Points Bonus Lives)Active High
0x0040Not fixedActive High
0x0000When fixedActive High
0xFF971Read PortDSW3 (// dipswitch 2)
0x0002Free_PlayActive High
0x0002OffActive High
0x0000OnActive High
0x001c1 (Earth)Active High
0x00184 (Venus)Active High
0x00147 (Mercury)Active High
0x001010 (Sun)Active High
0x000c13 (Pluto)Active High
0x000816 (Neptune)Active High
0x000419 (Uranus)Active High
0x000022 (Saturn)Active High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0xFF9C1Writefirq_ack_w
0xFFC0-0xFFDF32Read/Writepaletteram_r, paletteram_w
0xFFE0-0xFFFF32Readvector_r
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x4800-0x48012Device Writeay2, ay8910_device, address_data_w
0x48011Device Readay2, ay8910_device, data_r
0x4802-0x48032Device Writeay3, ay8910_device, address_data_w
0x48031Device Readay3, ay8910_device, data_r
0x4804-0x48052Device Writeay4, ay8910_device, address_data_w
0x48051Device Readay4, ay8910_device, data_r
0x50001Device Readsoundlatch, generic_latch_8_device, read
0xE000-0xEFFF4096ROM(// space for diagnostic ROM)
 

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
0x0000-0x1FFF8192a62_13.5CRC(7ce290db) (Fluke: EFB6)
0x2000-0x3FFF8192a62_14.4CRC(ea74b1a2) (Fluke: 8FB3)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384a62_12.78CRC(c5834a7a) (Fluke: C417)
0x4000-0x7FFF16384a62_10.77CRC(3ae7231e) (Fluke: F485)
0x8000-0xBFFF16384a62_08.80CRC(b9210dbe) (Fluke: 67E7)
0xC000-0xFFFF16384a62-16.79CRC(1165a622) (Fluke: 3857)
0x10000-0x13FFF16384a62_11.89CRC(d0e9974e) (Fluke: 625E)
0x14000-0x17FFF16384a62_09.88CRC(e93ef281) (Fluke: 5203)
0x18000-0x1BFFF16384a62_07.91CRC(64c95e8b) (Fluke: 94E4)
0x1C000-0x1FFFF16384a62_05.90CRC(c3c877ef) (Fluke: 3353)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384a62_01.30CRC(a5e82b3e) (Fluke: 96FC)
0x4000-0x7FFF16384a62_02.31CRC(25f5bcd3) (Fluke: A9B0)
0x8000-0xBFFF16384a62-15.52CRC(e65d8312) (Fluke: 87DB)
0xC000-0xFFFF16384a62_04.50CRC(fad74dfe) (Fluke: 98D8)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32a26-13.109CRC(ec449aee) (Fluke: 0CB0)
0x0020-0x003F32a26-13.110CRC(ec449aee) (Fluke: 0CB0)
0x0040-0x005F32a26-13.111CRC(ec449aee) (Fluke: 0CB0)
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