Gigas 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.

Gigas (Sega, 1986)

Memory Area:gigas_io_map

Address Range	Length	Function	Description
0x0000	1	Read/Write	spinner_r, spinner_select_w
0x0001	1	Read NOP	(//unused dip 3)

Memory Area:gigas_map

Address Range	Length	Function	Description
0x0000-0xBFFF	49152	ROM
0xC000-0xCFFF	4096	RAM
0xD000-0xD7FF	2048	RAM Write, Shared	freek_videoram_w, videoram
0xD800-0xD8FF	256	RAM, Shared	spriteram
0xD900-0xDFFF	1792	RAM
0xE000	1	Read Port, Write	IN0, flipscreen_w
0xE002-0xE003	2	Write	coin_w
0xE004	1	Write	nmi_enable_w
0xE005	1	Write NOP
0xE800	1	Read Port	IN1
0xF000	1	Read Port, Write NOP	DSW1, (//bankswitch ?)
0xF800	1	Read Port	DSW2
0xFC00	1	Device Write	sn1, sn76489a_device, write
0xFC01	1	Device Write	sn2, sn76489a_device, write
0xFC02	1	Device Write	sn3, sn76489a_device, write
0xFC03	1	Device Write	sn4, sn76489a_device, write

Memory Area:pbillrd_map

Address Range	Length	Function	Description
0x0000-0x7FFF	32768	ROM
0x8000-0xBFFF	16384	ROM Bank	bank1
0xC000-0xCFFF	4096	RAM
0xD000-0xD7FF	2048	RAM Write, Shared	freek_videoram_w, videoram
0xD800-0xD8FF	256	RAM, Shared	spriteram
0xD900-0xDFFF	1792	RAM
0xE000-0xE001	2	Write	flipscreen_xy_w
0xE000	1	Read Port	IN0
0xE002-0xE003	2	Write	coin_w
0xE004	1	Write	nmi_enable_w
0xE800	1	Read Port	IN1
0xF000	1	Read Port, Write	DSW1, pbillrd_bankswitch_w
0xF800	1	Read Port	DSW2
0xFC00	1	Device Write	sn1, sn76489a_device, write
0xFC01	1	Device Write	sn2, sn76489a_device, write
0xFC02	1	Device Write	sn3, sn76489a_device, write
0xFC03	1	Device Write	sn4, sn76489a_device, write

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 Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	4.3k	CRC(8ed78981) (Fluke: 12C5)
0x4000-0x7FFF	16384	5.3h	CRC(0645ec2d) (Fluke: 705E)
0x8000-0xBFFF	16384	6.3g	CRC(99e9cb27) (Fluke: 2F44)

Memory Area:gfx2

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	1.3p	CRC(d78fae6e) (Fluke: 5351)
0x4000-0x7FFF	16384	3.3l	CRC(37df4a4c) (Fluke: 282B)
0x8000-0xBFFF	16384	2.3n	CRC(3a46e354) (Fluke: 690D)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	8.8n	CRC(34ea8262)
0x4000-0xBFFF	32768	7.8r	CRC(43653909),27256 (Fluke: 3AC8)

Memory Area:proms

Address Range	Length	Label/Location	Description
0x0000-0x00FF	256	3a.bin	CRC(a784e71f) (Fluke: B092)
0x0100-0x01FF	256	4d.bin	CRC(376df30c) (Fluke: 33CE)
0x0200-0x02FF	256	4a.bin	CRC(4edff5bd) (Fluke: D3CE)
0x0300-0x03FF	256	3d.bin	CRC(fe201a4e) (Fluke: 1BDB)
0x0400-0x04FF	256	3b.bin	CRC(5796cc4a) (Fluke: CB4D)
0x0500-0x05FF	256	3c.bin	CRC(28b5ee4c) (Fluke: 619E)

Memory Area:user1

Address Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	317-5002.key	CRC(86a7e5f6) (Fluke: 23E0)