Last Four 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.

Last Four (B.R.L., 2001)

Memory Area:galaxi_map

Address Range	Length	Function	Description
0x0000-0x3FFFF	262144	ROM
0x100000-0x1003FF	1024	RAM Write, Shared	galaxi_bg1_w, bg1_ram
0x100400-0x1007FF	1024	RAM Write, Shared	galaxi_bg2_w, bg2_ram
0x100800-0x100BFF	1024	RAM Write, Shared	galaxi_bg3_w, bg3_ram
0x100C00-0x100FFF	1024	RAM Write, Shared	galaxi_bg4_w, bg4_ram
0x101000-0x101FFF	4096	RAM Write, Shared	galaxi_fg_w, fg_ram
0x102000-0x107FFF	24576	Read NOP	(// unknown)
0x300000-0x3007FF	2048	RAM Device Write, Shared	palette, palette_device, write, palette
0x500000-0x500001	2	Write	galaxi_500000_w
0x500000-0x500001	2	Read Port	INPUTS
0x500002-0x500003	2	Write	galaxi_500002_w
0x500004-0x500005	2	Write	galaxi_500004_w
0x600000-0x607FFF	32768	RAM, Shared	nvram (// 2x DS1230Y (non volatile SRAM))
0x700000-0x700001	2	Device Read/Write 8-bit	oki, okim6295_device, read, write, 0x00ff

Memory Area:lastfour_map

Address Range	Length	Function	Description
0x0000-0x3FFFF	262144	ROM
0x100000-0x1003FF	1024	RAM Write, Shared	galaxi_bg3_w, bg3_ram
0x100400-0x1007FF	1024	RAM Write, Shared	galaxi_bg4_w, bg4_ram
0x100800-0x100BFF	1024	RAM Write, Shared	galaxi_bg1_w, bg1_ram
0x100C00-0x100FFF	1024	RAM Write, Shared	galaxi_bg2_w, bg2_ram
0x101000-0x101FFF	4096	RAM Write, Shared	galaxi_fg_w, fg_ram
0x102000-0x107FFF	24576	Read NOP	(// unknown)
0x300000-0x3007FF	2048	RAM Device Write, Shared	palette, palette_device, write, palette
0x500000-0x500001	2	Read Port	INPUTS
0x500000-0x500001	2	Write	galaxi_500000_w
0x500002-0x500003	2	Write	galaxi_500002_w
0x500004-0x500005	2	Write	galaxi_500004_w
0x600000-0x607FFF	32768	RAM, Shared	nvram (// 2x DS1230Y (non volatile SRAM))
0x700000-0x700001	2	Device Read/Write 8-bit	oki, okim6295_device, read, write, 0x00ff

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:oki

Address Range	Length	Label/Location	Description
0x0000-0x1FFFF	131072	21.u38	CRC(e48523dd)