Western Gun Part II 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.

Western Gun Part II (Nintendo (Taito Corporation license), 1980)

Memory Area:main_cpu_map

Address Range	Length	Function	Description
0x0000-0x3FFF	16384	ROM
0x4000-0x7FFF	16384	RAM, Shared	videoram

Memory Area:main_io_map

Address Range

Length

Function

Description

0x0000

Read Port

IN0

0x0001	Joystickleft Right	Active High
0x0002	Joystickleft Left	Active High
0x0004	Joystickleft Up	Active High
0x0008	Joystickleft Down	Active High
0x0010	Joystickright Right	Active High
0x0020	Joystickright Left	Active High
0x0040	Joystickright Up	Active High
0x0080	Joystickright Down	Active High

0x0001

Read Port

IN1

0x0001	Joystickleft Right	Active High
0x0002	Joystickleft Left	Active High
0x0004	Joystickleft Up	Active High
0x0008	Joystickleft Down	Active High
0x0010	Joystickright Right	Active High
0x0020	Joystickright Left	Active High
0x0040	Joystickright Up	Active High
0x0080	Joystickright Down	Active High

0x0002

Write

n8080_shift_bits_w

0x0002

Read Port

IN2

0x0001	Button 1	Active High
0x0002	Button 1	Active High
0x0004	Start 1	Active High
0x0008	Start 2	Active High
0x0000	3	Active High
0x0010	4	Active High
0x0020	Upright	Active High
0x0000	Cocktail	Active High
0x0040	Unused	Active Low
0x0080	Coin 1	Active High

0x0003

Write

n8080_shift_data_w

0x0003

Read

n8080_shift_r

0x0004

Write

n8080_sound_1_w

0x0004

Read Port

IN3

0x0005

Write

n8080_sound_2_w

0x0006

Write

n8080_video_control_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
0x0000-0x07FF	2048	rf06.ic35	CRC(4eafe957)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x0000-0x07FF	2048	rf01.ic36	CRC(7eabc538)
0x0800-0x0FFF	2048	rf02.ic35	CRC(3344d6a5)
0x1000-0x17FF	2048	rf03.ic34	CRC(d4bb08fd)
0x1800-0x1FFF	2048	rf04.ic33	CRC(60b71f0d)
0x2000-0x27FF	2048	rf05.ic32	CRC(81e650fb)