Butterfly Video Game 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.

Butterfly Video Game (Bordun International, 1995)

Memory Area:io_map_skylncr

Address Range	Length	Function	Description
0x0000-0x0003	4	Device Read/Write	ppi8255_0, i8255_device, read, write (/* Input Ports */)
0x0010-0x0013	4	Device Read/Write	ppi8255_1, i8255_device, read, write (/* Input Ports */)
0x0020	1	Write	skylncr_coin_w
0x0030-0x0031	2	Device Write	aysnd, ay8910_device, address_data_w
0x0031	1	Device Read	aysnd, ay8910_device, data_r
0x0040	1	Device Write	ramdac, ramdac_device, index_w
0x0041	1	Device Write	ramdac, ramdac_device, pal_w
0x0042	1	Device Write	ramdac, ramdac_device, mask_w
0x0050	1	Device Write	ramdac2, ramdac_device, index_w
0x0051	1	Device Write	ramdac2, ramdac_device, pal_w
0x0052	1	Device Write	ramdac2, ramdac_device, mask_w
0x0070	1	Write	skylncr_nmi_enable_w

Memory Area:mem_map_skylncr

Address Range	Length	Function	Description
0x0000-0x7FFF	32768	ROM
0x8000-0x87FF	2048	RAM, Shared	nvram
0x8800-0x8FFF	2048	RAM Write, Shared	skylncr_videoram_w, videoram
0x9000-0x97FF	2048	RAM Write, Shared	skylncr_colorram_w, colorram
0x9800-0x99FF	512	RAM Write, Shared	reeltiles_1_w, reeltiles_1_ram
0x9A00-0x9BFF	512	RAM Write, Shared	reeltiles_2_w, reeltiles_2_ram
0x9C00-0x9DFF	512	RAM Write, Shared	reeltiles_3_w, reeltiles_3_ram
0x9E00-0x9FFF	512	RAM Write, Shared	reeltiles_4_w, reeltiles_4_ram
0xA000-0xA1FF	512	RAM Write, Shared	reeltileshigh_1_w, rthigh_1_ram
0xA200-0xA3FF	512	RAM Write, Shared	reeltileshigh_2_w, rthigh_2_ram
0xA400-0xA5FF	512	RAM Write, Shared	reeltileshigh_3_w, rthigh_3_ram
0xA600-0xA7FF	512	RAM Write, Shared	reeltileshigh_4_w, rthigh_4_ram
0xAA55	1	Read	ret_ff
0xB000-0xB03F	64	RAM Write, Shared	reelscroll1_w, reelscroll1
0xB040-0xB07F	64	RAM Write	reelscroll1_w
0xB080-0xB0BF	64	RAM Write	reelscroll1_w
0xB0C0-0xB0FF	64	RAM Write	reelscroll1_w
0xB100-0xB13F	64	RAM Write	reelscroll1_w
0xB140-0xB17F	64	RAM Write	reelscroll1_w
0xB180-0xB1BF	64	RAM Write	reelscroll1_w
0xB1C0-0xB1FF	64	RAM Write	reelscroll1_w
0xB200-0xB23F	64	RAM Write, Shared	reelscroll2_w, reelscroll2
0xB240-0xB27F	64	RAM Write	reelscroll2_w
0xB280-0xB2BF	64	RAM Write	reelscroll2_w
0xB2C0-0xB2FF	64	RAM Write	reelscroll2_w
0xB300-0xB33F	64	RAM Write	reelscroll2_w
0xB340-0xB37F	64	RAM Write	reelscroll2_w
0xB380-0xB3BF	64	RAM Write	reelscroll2_w
0xB3C0-0xB3FF	64	RAM Write	reelscroll2_w
0xB400-0xB43F	64	RAM Write, Shared	reelscroll3_w, reelscroll3
0xB440-0xB47F	64	RAM Write	reelscroll3_w
0xB480-0xB4BF	64	RAM Write	reelscroll3_w
0xB4C0-0xB4FF	64	RAM Write	reelscroll3_w
0xB500-0xB53F	64	RAM Write	reelscroll3_w
0xB540-0xB57F	64	RAM Write	reelscroll3_w
0xB580-0xB5BF	64	RAM Write	reelscroll3_w
0xB5C0-0xB5FF	64	RAM Write	reelscroll3_w
0xB600-0xB63F	64	RAM Write, Shared	reelscroll4_w, reelscroll4
0xB640-0xB67F	64	RAM Write	reelscroll4_w
0xB680-0xB6BF	64	RAM Write	reelscroll4_w
0xB6C0-0xB6FF	64	RAM Write	reelscroll4_w
0xB700-0xB73F	64	RAM Write	reelscroll4_w
0xB740-0xB77F	64	RAM Write	reelscroll4_w
0xB780-0xB7BF	64	RAM Write	reelscroll4_w
0xB7C0-0xB7FF	64	RAM Write	reelscroll4_w
0xC000-0xFFFF	16384	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:maincpu

Address Range	Length	Label/Location	Description
0x0000-0xFFFF	65536	butterfly.prg	CRC(b35b289c) (Fluke: FE7F)