One + Two 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.

One + Two (Barko, 1997)

Memory Area:main_cpu

Address Range	Length	Function	Description
0x0000-0x7FFF	32768	ROM, Region	maincpu, 0x10000
0x8000-0xBFFF	16384	ROM Bank	bank1
0xC800-0xC87F	128	RAM Write, Shared	palette1_w, paletteram
0xC900-0xC97F	128	RAM Write, Shared	palette2_w, paletteram2
0xD000-0xDFFF	4096	RAM Write, Shared	onetwo_fgram_w, fgram
0xE000-0xFFFF	8192	RAM

Memory Area:main_cpu_io

Address Range

Length

Function

Description

0x0000

Read Port, Write

DSW1, onetwo_coin_counters_w

0x0003	Easy	Active High
0x0002	Normal	Active High
0x0001	Hard	Active High
0x0000	Hardest	Active High
0x000c	Difficulty	Active High
0x000c	Easy	Active High
0x0008	Normal	Active High
0x0004	Hard	Active High
0x0000	Hardest	Active High
0x00f0	Coinage	Active High
0x00a0	6C_1C	Active High
0x00b0	5C_1C	Active High
0x00c0	4C_1C	Active High
0x00d0	3C_1C	Active High
0x0010	8C_3C	Active High
0x00e0	2C_1C	Active High
0x0020	5C_3C	Active High
0x0030	3C_2C	Active High
0x00f0	1C_1C	Active High
0x0040	2C_3C	Active High
0x0090	1C_2C	Active High
0x0080	1C_3C	Active High
0x0070	1C_4C	Active High
0x0060	1C_5C	Active High
0x0050	1C_6C	Active High
0x0000	Free_Play	Active High
0x0030	Coin_A	Active High
0x0000	5C_1C	Active High
0x0010	3C_1C	Active High
0x0020	2C_1C	Active High
0x0030	1C_1C	Active High
0x00c0	Coin_B	Active High
0x00c0	1C_2C	Active High
0x0080	1C_3C	Active High
0x0040	1C_5C	Active High
0x0000	1C_6C	Active High

0x0001

Read Port, Write

DSW2, onetwo_soundlatch_w

0x0001	Unknown	Active High
0x0001	Off	Active High
0x0000	On	Active High
0x0002	Demo_Sounds	Active High
0x0002	Off	Active High
0x0000	On	Active High
0x0004	Common	Active High
0x0000	Separate	Active High
0x0000	Off	Active High
0x0008	On	Active High
0x0000	No	Active High
0x0010	Yes	Active High
0x0020	Off	Active High
0x0000	On	Active High
0x0000	1 Player	Active High
0x0040	2 Player	Active High
0x0000	Off	Active High
0x0080	On	Active High

0x0002

Read Port, Write

P1, onetwo_cpubank_w

0x0001	Joystick Up	Active Low
0x0002	Joystick Down	Active Low
0x0004	Joystick Left	Active Low
0x0008	Joystick Right	Active Low
0x0010	Button 1	Active Low
0x0020	Button 2	Active Low
0x0040	Button 3	Active Low
0x0080	Unknown	Active Low

0x0003

Read Port

0x0001	Joystick Up	Active Low
0x0002	Joystick Down	Active Low
0x0004	Joystick Left	Active Low
0x0008	Joystick Right	Active Low
0x0010	Button 1	Active Low
0x0020	Button 2	Active Low
0x0040	Button 3	Active Low
0x0080	Unknown	Active Low

0x0004

Read Port

SYSTEM

0x0001	Coin 1	Active Low
0x0002	Coin 2	Active Low
0x0004	Start 1	Active Low
0x0008	Start 2	Active Low
0x0010	Service 1	Active Low
0x0020	Unknown	Active Low
0x0040	Unknown	Active Low
0x0080	Unknown	Active Low

Memory Area:sound_cpu

Address Range	Length	Function	Description
0x0000-0x5FFF	24576	ROM
0xF000-0xF7FF	2048	RAM
0xF800	1	Device Read	soundlatch, generic_latch_8_device, read

Memory Area:sound_cpu_io

Address Range	Length	Function	Description
0x0000	1	Device Read/Write	ymsnd, ym3812_device, status_port_r, control_port_w
0x0020	1	Device Write	ymsnd, ym3812_device, write_port_w
0x0040	1	Device Read/Write	oki, okim6295_device, read, write
0x00C0	1	Device Write	soundlatch, generic_latch_8_device, clear_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:audiocpu

Address Range	Length	Label/Location	Description
0x0000-0xFFFF	65536	sound_prog	CRC(90aba4f3) (Fluke: 4720)
0x0000-0xFFFF	65536	sound_prog	CRC(90aba4f3) (Fluke: 4720)

Memory Area:gfx1

Address Range	Length	Label/Location	Description
0x0000-0x7FFFF	524288	3_graphics	CRC(c72ff3a0) (Fluke: 1B65)
0x80000-0xFFFFF	524288	4_graphics	CRC(0ca40557) (Fluke: 4682)
0x100000-0x17FFFF	524288	5_graphics	CRC(664b6679) (Fluke: 8E77)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x10000-0x2FFFF	131072	maincpu	CRC(83431e6e) (Fluke: 82E3)

Memory Area:oki

Address Range	Length	Label/Location	Description
0x0000-0x3FFFF	262144	sample	CRC(b10d3132) (Fluke: 7171)
0x0000-0x3FFFF	262144	sample	CRC(b10d3132) (Fluke: 7171)