Gekitsui Oh 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.

Gekitsui Oh (Data East Corporation, 1985)

Memory Area:gekitsui_cpu1_map

Address Range	Length	Function	Description
0x0000-0x0FFF	4096	RAM, Shared	share1
0x1000-0x11FF	512	RAM, Shared	spriteram
0x1200-0x1FFF	3584	RAM
0x2000-0x23FF	1024	RAM Write, Shared	cntsteer_foreground_vram_w, videoram
0x2400-0x27FF	1024	RAM Write, Shared	cntsteer_foreground_attr_w, colorram
0x3000-0x3003	4	Write	zerotrgt_ctrl_w
0x8000-0xFFFF	32768	ROM

Memory Area:gekitsui_cpu2_map

Address Range	Length	Function	Description
0x0000-0x0FFF	4096	RAM, Shared	share1
0x1000-0x1FFF	4096	RAM Write, Shared	cntsteer_background_w, videoram2
0x3000-0x3004	5	Write	zerotrgt_vregs_w
0x3000	1	Read Port	DSW0
0x3001	1	Read Port	P2
0x3002	1	Read Port	P1
0x3003	1	Read Port	COINS
0x3005	1	Write	gekitsui_sub_irq_ack
0x3007	1	Write	cntsteer_sound_w
0x4000-0xFFFF	49152	ROM

Memory Area:sound_map

Address Range	Length	Function	Description
0x0000-0x01FF	512	RAM
0x2000	1	Device Write	ay1, ay8910_device, data_w
0x4000	1	Device Write	ay1, ay8910_device, address_w
0x6000	1	Device Write	ay2, ay8910_device, data_w
0x8000	1	Device Write	ay2, ay8910_device, address_w
0xA000	1	Device Read	soundlatch, generic_latch_8_device, read
0xD000	1	Write	nmimask_w
0xE000-0xFFFF	8192	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
0xE000-0xFFFF	8192	ct00.1c	CRC(ae091b6c) (Fluke: B996)

Memory Area:gfx1

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	ct05	CRC(b9e997a1),Characters (Fluke: F734)

Memory Area:gfx2

Address Range	Length	Label/Location	Description
0x0000-0x7FFF	32768	ct02.14c	CRC(d2a0bb72) (Fluke: D923)
0x8000-0xFFFF	32768	ct03.15c	CRC(79f2be20) (Fluke: 8BB2)
0x10000-0x17FFF	32768	ct04.17c	CRC(1037cce8) (Fluke: DD04)

Memory Area:gfx3

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	ct09.4j	CRC(8c859d41) (Fluke: 66B0)
0x10000-0x13FFF	16384	ct11.7j	CRC(5da2d9d8) (Fluke: 26DC)
0x20000-0x23FFF	16384	ct13.10j	CRC(b004cedd) (Fluke: C25B)
0x30000-0x33FFF	16384	ct15.13j	CRC(4473fe66) (Fluke: 6292)

Memory Area:gfx4

Address Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	ct10.6j	CRC(16073975) (Fluke: 464F)
0x10000-0x11FFF	8192	ct12.9j	CRC(9776974e) (Fluke: 64E6)
0x20000-0x21FFF	8192	ct14.12j	CRC(5f77e84d) (Fluke: 5254)
0x30000-0x31FFF	8192	ct16.15j	CRC(ebed04d3) (Fluke: 9EF2)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x8000-0xFFFF	32768	ct01	CRC(d3d82d8d) (Fluke: B5DE)

Memory Area:plds

Address Range	Length	Label/Location	Description
0x0000-0x002B	44	pal10h8.12f	CRC(173f9798) (Fluke: B320)
0x0100-0x012B	44	pal10h8.14e	PAL is read protected
0x0200-0x0233	52	pal12l6.17f	CRC(29b7e869) (Fluke: 2475)

Memory Area:proms

Address Range	Length	Label/Location	Description
0x0000-0x00FF	256	mb7118h.7k	CRC(4a7c187a) (Fluke: 0AB7)
0x0100-0x01FF	256	mb7052.6k	CRC(cc9c7d43) (Fluke: 3478)

Memory Area:subcpu

Address Range	Length	Label/Location	Description
0x4000-0x7FFF	16384	ct08.16a	CRC(7e8db408) (Fluke: 1466)
0x8000-0xBFFF	16384	cty07.14a	CRC(119b6211) (Fluke: A535)
0xC000-0xFFFF	16384	ct06.13a	CRC(bce5adad) (Fluke: 9C6A)