Emulatrix

JavaScript and WebAssembly Emulator - Sega Genesis, Nintendo, Super Nintendo, GameBoy, GameBoy Color, GameBoy Advance, MAME32, DOSBox and Virtual Machines.

Web

https://www.emulatrix.com

How does it work?

It's a Web project that is 50% in JavaScript and 50% in WebAssembly. It uses the HTML5 File API for reading a file from the computer, so the End User must select the ROM file from his computer. After that, it uses BrowserFS, which creates a virtual filesystem on the client side where the ROM file is uploaded. When using the DOS emulator, there is a Web File Manager that allows the End User to upload and download files to/from that virtual filesystem. The emulators are in WebAssembly and the content is rendered on a Canvas and for audio it uses an AudioContext. There is a JavaScript logic that handles the AudioContext (for mute/unmute) and another logic for pausing and resuming the emulation when the window is on blur or on focus.

IMPORTANT - After clicking on the upload icon

PLATFORM	HOW TO PLAY A GAME?	FILE FORMAT
Nintendo	Select the game file from your device.	NES
Super Nintendo	Select the game file from your device.	SMC, SFC, SRM
GameBoy	Select the game file from your device.	GB
GameBoy Color	Select the game file from your device.	GBC
GameBoy Advance	Select the game file from your device.	GBA
Sega Genesis	Select the game file from your device.	BIN, SMD, MD
MAME32	Select the game file from your device.	ZIP
DOS	Select the game file from your device.	ZIP
Virtual Machines	Select the disk file from your device.	ZIP

When running DOS, Emulatrix will try to run AUTORUN.BAT from the ZIP file after booting.
Regarding virtual machines, the ZIP file must contain a c.img file that will be mounted and booted.

DOSBox useful commands

TYPE IN THE PROMPT	RESULT
mount d . -t cdrom	Mounting a path as a CD-ROM
imgmount d cd1.cue cd2.cue -t cdrom	Mounting two CD-ROM images
config -set "cycles=4000"	Default emulation speed
config -set "cycles=10000"	Faster emulation speed
config -set "cycles=15000"	Faster emulation speed
config -set "cycles=20000"	Fastest emulation speed
config -set "sbtype=none"	Sound Blaster disabled
pkzip folder.zip c:\myfolder\. -rp	Creates folder.zip with myfolder content

For switching CD-ROM images you must press Ctrl+F4 (Windows) or Fn + Control + Option + F4 (Mac). This also can be used for refreshing the filesystem after uploading a file.

Original core files

PLATFORM	URL	CORE
Nintendo	https://buildbot.libretro.com/stable	fceumm
Super Nintendo	https://buildbot.libretro.com/stable	snes9x2010
GameBoy	https://buildbot.libretro.com/stable	gambatte
GameBoy Color	https://buildbot.libretro.com/stable	gambatte
GameBoy Advance	https://buildbot.libretro.com/stable	vba_next
Sega Genesis	https://buildbot.libretro.com/stable	genesis_plus_gx
MAME32	https://buildbot.libretro.com/stable	mame2003_plus
MAME32	https://buildbot.libretro.com/stable	fbalpha2012
DOS	https://github.com/dreamlayers/em-dosbox	dosbox

Core files modifications

PLATFORM	TYPE	DETAILS
Libretro cores	Bugfix	Content resized to canvas
Libretro cores	Bugfix	Delayed compilation workaround
Libretro cores	Feature	Mute/unmute implementation
Libretro cores	Feature	Load/save state implementation
Libretro cores	Feature	Paused/resumed emulation on blur/focus
DOSBox core	Bugfix	Launching emulator on blur
DOSBox core	Bugfix	SimulateInfiniteLoop in 16 bits systems
DOSBox core	Bugfix	Removed black margin when trying fullscreen
DOSBox core	Feature	PKZip implementation
DOSBox core	Feature	Mute/unmute implementation
DOSBox core	Feature	Load/save file implementation
DOSBox core	Feature	Paused/resumed emulation on blur/focus

MAME 2003 Plus notes:

Playing Killer Instinct: Create a zip file named kinst-chd.zip that must contain kinst.zip and kinst.chd. Emulatrix will unzip those files in order to run the game (takes several seconds).
Saving and loading states: In some games (Killer Instinct, Mortal Kombat 1, 2 and Ultimate) the saving function doesn't work (core issue).