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A78 files are used by a variety of emulators to play older Atari games on computers. Some Atari 7800 emulators that can open A78 files include Emu7800, ProSystem Emulator, MESS, and OpenEmu. Atari 7800 is a video game console released in 1986 that replaced the Atari 5200. Some Atari 7800 game titles include Centipede, Dig Dug, Ms. OpenEmu is a modular, multi-platform video game emulator for Mac OS X, and last week, support was added for 16 classic consoles, which the developers have listed below: Atari 5200 Atari 7800. Best Mac emulators guide: OpenEmu - NES, Mega Drive & beyond OpenEmu wants to 'change the world of videogame emulation', and on the Mac it's doing a great.

I assume because it's set up to assume the gamepad is there, since the last couple times I've used OE I've used an SNES USB gamepad. RIght now though I have nothing plugged in and it's crashing when I try to start games or view the contr.
Atari St Emulator Mac Os X. This is a cross-platform plug in-based N64 emulator which is capable of playing most of the games accurately. OpenEmu is one of the.

2Nintendo
3Sony
4Sega
5Atari
6Microsoft
7Other consoles
8Personal computers

With OpenEmu, it is extremely easy to add, browse, organize and with a compatible gamepad, play those favorite games (ROMs) you already own. Download Now v2.3.3. For macOS (OS X) 10.14.4 or above. Please read special instructions for opening.

Multi-system

File type(s)	Emulator(s)	Backup
BIOS files	RetroArch	✓
BIOS files	Mednafen(standalone)	✓
BIOS files	OpenEmu	✓
ROMs Pack(0.151)	MESS	✓
ROMs Pack(v16) ROMs Pack(v17)	PCem	✓
ROMs Pack	86Box	✓

Nintendo

NES / Famicom

File type(s)	Emulator(s)	Backup	Note
Family Computer Disk System BIOS file	Various	✓	Required for FDS emulation. MD5 Hashes

SNES / Super Famicom

File type(s)	Emulator(s)	Backup	Note
Satellaview BS-X ROMs	higan(bsnes) Snes9x	✓	Required for some Satellaview releases. Including Japanese original ROM, no-DRM ROM and English-patched ROMs (DRM or no-DRM).
Sufami Turbo BIOS file	higan(bsnes) Snes9x	✓	Required for Bandai's Sufami Turbo emulation.
SuperDisc BIOS file	No$SNS(1.6)	✓	Required for Sony's SNES-CD emulation.
Super Game Boy boot ROM	higan(bsnes)	✓	Required for Super Game Boy emulation. MD5 Hashes
Coprocessor firmwares	higan(bsnes)	✓	Including CX4, DSP1/1A, DSP1B, DSP2, DSP3, DSP4, ST010, ST011 and ST018. More information

Nintendo 64

File type(s)	Emulator(s)	Backup	Note
LLE RSP plugin	Project64	N/A
64DD IPL and PIF ROM (JPN Retail)	CEN64	✓	Required for 64DD emulation in CEN64. Japanese region only.
64DD IPL (JPN Retail)	Project64	✓	Required for 64DD emulation in Project64.
64DD IPL (US Retail)
64DD IPL (JPN Development)

GameCube / Wii

File type(s)	Emulator(s)	Backup	Note
GameCube IPL BIOS file	Dolphin	✓	Optional. Required for rendering original system fonts. MD5 Hashes
DSP-LLE plugin		✓	Optional. Needed for more accurate low-level emulation (LLE) of DSP audio. Required in Dolphin for connectivity with GBA units. An incomplete HLE solution removing this requirement exists.
Swiss		N/A	Optional. GameCube homebrew utility. More information Old version (r241)
Wii WC24 network SSL certificates		✓	Optional. Required for connecting to Wi-Fi Connection service. More information

Free Atari St Games

Game Boy / Game Boy Color

File type(s)	Emulator(s)	Backup	Note
Game Boy (DMG) boot ROMs	Various	✓	Optional.
Game Boy Pocket (MBG) boot ROM		✓	Optional.
GBC boot ROM		✓	Optional. Required for color palette support for monochrome GB games.

Pokémon mini

File type(s)	Emulator(s)	Backup	Note
BIOS	Various	✓	Optional in PokeMini and minimon.

Game Boy Advance / e-Reader

File type(s)	Emulator(s)	Backup	Note
Boot ROM	Various	✓	Optional. Required for some games, homebrew, and connectivity with the GameCube.
e-Reader BIOS files	Various	✓	Required for e-Reader emulation. Including Card e-Reader (Japan), Card e-Reader+ (Japan) and e-Reader (USA).

Nintendo DS / DSi

File type(s)	Emulator(s)	Backup	Note
DS BIOS files and firmware	Various	✓	Optional for DeSmuME and No$GBA. Required for melonDS, GBE+, medusa and other emulators.
iQue BIOS files and firmware	Various	✓
DSi BIOS files	No$GBA	✓	Required for Nintendo DSi emulation.
DSi NAND dump	No$GBA	✓	Optional. Improves compatibility for Nintendo DSi emulation. Update No$GBA in the package to the latest version is highly recommended.
DSi BIOS & NAND (USA)	melonDS, No$GBA	✓	Required for DSi emulation on melonDS. Includes BIOS and firmware for both the DS and DSi, and a NAND dump. For No$GBA, rename: `nand.bin` `biosdsi7.bin` `biosdsi9.bin` to `DSi-1.mmc` `BIOSDSI7.ROM` `BIOSDSI9.ROM` respectively, and place them in the No$GBA main folder.
DSi BIOS & NAND (EUR)		✓

Nintendo 3DS

File type(s)	Emulator(s)	Backup	Note
Extra data	Citra	✓	Required for some games.
Bootroms	Citra	✓	Required for fuse-3ds to decrypt encrypted games.

Wii U

File type(s)	Emulator(s)	Backup	Note
Fonts	Cemu	✓	Required for rendering text properly in some games. Lacks three more unused fonts, but Cemuhook has their replacements.
Online files	Cemu(1.11.0 or later) Decaf	✓	Optional. Needed for online connection. Lacks unbanned account.dat file unique to the console but some custom servers with lax authentification are working in progress.
Menu files (EU)	Cemu(1.11.4 or later)	✓	Version 5.5.2, European region Required for rendering Mii and improving compatibility. More information Can be accessed from the .rpx under `mlc01systitle0005001010040200codemen.rpx`.
Menu files (US)		✓	Version 5.5.2, US region Required for rendering Mii and improving compatib

Openemu Atari St Games