Halley's Comet Memory Map

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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 Corporation, 1986)

Memory Area:halleys_map

Address Range	Length	Function	Description
0x0000-0x0FFF	4096	Read/Write, Shared	blitter_r, blitter_w, blitter_ram
0x1000-0xEFFF	57344	ROM
0x1F00-0x1FFF	256	Write	bgtile_w (// background tiles?(Ben Bero Beh only))
0xF000-0xFEFF	3840	RAM	(// work ram)
0xFF00-0xFFBF	192	RAM, Shared	io_ram (// I/O write fall-through)
0xFF66	1	Read	collision_id_r (// HACK: collision detection bypass(Halley's Comet only))
0xFF71	1	Read	blitter_status_r
0xFF80-0xFF83	4	Read	io_mirror_r
0xFF8A	1	Write	soundcommand_w
0xFF90	1	Read Port	IN0 (// coin/start)
0xFF91	1	Read Port	IN1 (// player 1)
0xFF92	1	Read Port	IN2 (// player 2)
0xFF93	1	Read Port	IN3 (// unused?)
0xFF94	1	Read	coin_lockout_r
0xFF95	1	Read Port	DSW1 (// dipswitch 4)
0xFF96	1	Read Port	DSW2 (// dipswitch 3)
0xFF97	1	Read Port	DSW3 (// dipswitch 2)
0xFF9C	1	Write	firq_ack_w
0xFFC0-0xFFDF	32	Read/Write	paletteram_r, paletteram_w
0xFFE0-0xFFFF	32	Read	vector_r

Memory Area:sound_map

Address Range	Length	Function	Description
0x0000-0x3FFF	16384	ROM
0x4000-0x47FF	2048	RAM
0x4800-0x4801	2	Device Write	ay2, ay8910_device, address_data_w
0x4801	1	Device Read	ay2, ay8910_device, data_r
0x4802-0x4803	2	Device Write	ay3, ay8910_device, address_data_w
0x4803	1	Device Read	ay3, ay8910_device, data_r
0x4804-0x4805	2	Device Write	ay4, ay8910_device, address_data_w
0x4805	1	Device Read	ay4, ay8910_device, data_r
0x5000	1	Device Read	soundlatch, generic_latch_8_device, read
0xE000-0xEFFF	4096	ROM	(// 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 Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	a62_13.5	CRC(7ce290db) (Fluke: EFB6)
0x0000-0x1FFF	8192	a62_13.5	CRC(7ce290db) (Fluke: EFB6)
0x2000-0x3FFF	8192	a62_14.4	CRC(ea74b1a2) (Fluke: 8FB3)
0x2000-0x3FFF	8192	a62_14.4	CRC(ea74b1a2) (Fluke: 8FB3)

Memory Area:gfx1

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	a62_12.78	CRC(c5834a7a) (Fluke: C417)
0x0000-0x3FFF	16384	a62_12.78	CRC(c5834a7a) (Fluke: C417)
0x4000-0x7FFF	16384	a62_10.77	CRC(3ae7231e) (Fluke: F485)
0x4000-0x7FFF	16384	a62_10.77	CRC(3ae7231e) (Fluke: F485)
0x8000-0xBFFF	16384	a62_08.80	CRC(b9210dbe) (Fluke: 67E7)
0x8000-0xBFFF	16384	a62_08.80	CRC(b9210dbe) (Fluke: 67E7)
0xC000-0xFFFF	16384	a62_06.79	CRC(600be9ca) (Fluke: 15DB)
0xC000-0xFFFF	16384	a62_06.79	CRC(600be9ca) (Fluke: 15DB)
0x10000-0x13FFF	16384	a62_11.89	CRC(d0e9974e) (Fluke: 625E)
0x10000-0x13FFF	16384	a62_11.89	CRC(d0e9974e) (Fluke: 625E)
0x14000-0x17FFF	16384	a62_09.88	CRC(e93ef281) (Fluke: 5203)
0x14000-0x17FFF	16384	a62_09.88	CRC(e93ef281) (Fluke: 5203)
0x18000-0x1BFFF	16384	a62_07.91	CRC(64c95e8b) (Fluke: 94E4)
0x18000-0x1BFFF	16384	a62_07.91	CRC(64c95e8b) (Fluke: 94E4)
0x1C000-0x1FFFF	16384	a62_05.90	CRC(c3c877ef) (Fluke: 3353)
0x1C000-0x1FFFF	16384	a62_05.90	CRC(c3c877ef) (Fluke: 3353)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	a62_01.30	CRC(a5e82b3e) (Fluke: 96FC)
0x0000-0x3FFF	16384	a62_01.30	CRC(a5e82b3e) (Fluke: 96FC)
0x4000-0x7FFF	16384	a62_02.31	CRC(25f5bcd3) (Fluke: A9B0)
0x4000-0x7FFF	16384	a62_02.31	CRC(25f5bcd3) (Fluke: A9B0)
0x8000-0xBFFF	16384	a62_03.52	CRC(8e90a97b) (Fluke: 0E4B)
0xC000-0xFFFF	16384	a62_04.50	CRC(fad74dfe) (Fluke: 98D8)
0xC000-0xFFFF	16384	a62_04.50	CRC(fad74dfe) (Fluke: 98D8)

Memory Area:proms

Address Range	Length	Label/Location	Description
0x0000-0x001F	32	a26-13.109	CRC(ec449aee) (Fluke: 0CB0)
0x0000-0x001F	32	a26-13.109	CRC(ec449aee) (Fluke: 0CB0)
0x0020-0x003F	32	a26-13.110	CRC(ec449aee) (Fluke: 0CB0)
0x0020-0x003F	32	a26-13.110	CRC(ec449aee) (Fluke: 0CB0)
0x0040-0x005F	32	a26-13.111	CRC(ec449aee) (Fluke: 0CB0)
0x0040-0x005F	32	a26-13.111	CRC(ec449aee) (Fluke: 0CB0)