Emulators for Android

iNES  |  MasterGear  |  Speccy  |  fMSX  |  ColEm  |  AlmostTI  |  VGB  |  VGBA
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by Marat Fayzullin

Nintendo Entertainment System, Famicom, GameBoy, Super GameBoy, GameBoy Color, GameBoy Advance, Pocket Printer, GameLink, and DiskSystem are trademarks of Nintendo. SEGA SG1000, SC3000, SF7000, Master System, and GameGear are trademarks of SEGA. While programs presented at this site attempt to create "compatible" environment for the gaming software, they are not equivalent to the original hardware.

Emulators are programs that run software written for old computers or videogame consoles on the new hardware. Essentially, an emulator makes old software "think" that it is running on the original hardware, while it actually runs on your computer. I am creating emulators since 1993 and have made quite a few of them. For those who would like to try making an emulator on their own but do not know where to start, I have written a short introduction into the craft.

Originally, I developed emulators for PCs and Unix workstations. Once the mobile devices, such as cell phones and tablets, became capable of emulating older hardware, I started porting my emulators to these devices. Thus, at this page you will find my applications for Android-based phones and tablets, as well as some useful tips on setting them up.

If you work for a game company that would like to run its legacy games on mobile phones or other hardware, and need help, contact me.


Optimized for Android
Emulation and screen rendering are heavily optimized for Android platform using hand-written ARM assembly and OpenGLES.
The fast-forwarding feature lets you quickly skip through long dialogs and demo sequences.
Joystick Emulation
The joystick is emulated with hardware keys, virtual joypad, or accelerometer. Sony Xperia Play, Nyko, MOGA, iCade, and Sixaxis controllers also supported.
The gameplay can be saved at any moment and restored to the same point later. Emulators will also save state on exit, letting you restart where you have left off.
Mouse Emulation
For the old software that requires a mouse, it is emulated with the touch screen.
Recording Music
The soundtrack can be saved to a MIDI file to be played back later or used as a ringtone.
Compressed Files
The emulators will automatically process files with .zip (WinZIP) and .gz (GZIP) extensions. You do not need to unpack these files.
Built-in Debugger
Many emulators include a built-in debugger for hacking or developing your own retro software.
Cheatopedia offers hundreds of cheats for popular games, or you can enter your own cheat codes.
The emulators will save stamp-sized screenshots for each game you play, and show them in the file selection dialog.
State Exchange
State Exchange lets you swap gameplay states with other users playing the same game.
Network Play
The NetPlay feature lets you play with other users over local network or Internet.
Normal Display
The picture fills the center of your device screen, while retaining the original display ratio.
Stretched Display
The picture is stretched horizontally to fill the entire device screen, for the biggest possible size.
Softened Display
The picture is softened, hiding individual pixels, as if it were shown on an old analog TV.
TV Scanlines
Horizontal raster lines are added, simulating analog TV interlace effect.
Keyboard Emulation
The keyboard is naturally emulated with the hardware keyboard or the on-screen virtual keyboard, in case your Android device lacks a real one.
Frame Rate Display
The frame rate counter shows how fast your emulation is running. The ideal rates are 60Hz for NTSC video and 50Hz for PAL video.


28 July 2016

MasterGear 3.6 is now online. It includes a bunch of hardware-accelerated scanline and color raster effects using GLES2 fragment shaders. To try the new effects, make sure you have "Video | Hardware Acceleration" enabled, then choose wanted effects from the "Video" tab.

27 July 2016

Speccy 4.1, released this morning, adds the hardware accelerated scanline and color raster effects using GLES2 fragment shaders. Make sure you have "Video | Hardware Acceleration" enabled, then select desired scanline and raster effects from the "Video" tab.

25 July 2016

Published iNES 4.5.11 tonight, adding high-quality scanline and color mask effects based on GLES2 hardware shaders. Enable "Video | Hardware Acceleration", then select any combination of scanline and color mask effects from the "Video" Settings tab. More stuff coming soon, as I debug GLES2 scalers.

21 July 2016

Today's VGBAnext 5.3.3 adds high-quality GLES2-accelerated scanline effects. In order to see the new effects, make sure you enable "Video | Hardware Acceleration" and select wanted effect via "Video | Scanline Effect". To join the current Pokemon Go frenzy, I have also added new cheats for the original Pokemon Red, Blue, Gold, and Silver GameBoy games and fixed some errors in the existing cheat codes for these games. Please note that for a lot of these cheats, you have to disable the cheat after activating it once. The changes to your game stats will stay.

20 July 2016

In the spirit of the current Pokemon Go craze, I have released VGB 4.9.10 today. This release adds new Cheatopedia cheats for the original Pokemon Red, Blue, Gold, and Silver GameBoy games. I have also fixed errors and corrupted entries in the existing cheat lists for these games. Please note that for a lot of these cheats, you need to disable the cheat after it has been applied once. Your modified stats or items will stay after disabling the cheat.

18 July 2016

ColEm 3.7.1 is now out on Google Play, Opera Store, and Aptoide. Changes include the video rendering switch to OpenGLES2 (for better performance and future enhancements) and better gamepad support in the Cheat Editor and Palette Editor, making AndroidTV users happier.

14 July 2016

VGBAnext 5.3.2, released today, adds Cheatopedia cheats for nine more games, including Ace Combat, Batman Begins, Buffy, Counter Punch, and Land Before Time.

13 July 2016

fMSX 4.6.1, released today, adds options to emulate BDOS calls (rather than the floppy disk controller itself) and to skip loading the MSXDOS2.ROM (since some MSXDOS 1.x programs do not work well with it loaded). I have also switched video rendering from GLES1 to the newer GLES2, for better performance and future special effect shaders. AndroidTV users will find it easier to operate Cheat Editor and Palette Editor, since these features now let gamepad X button to apply changes, Y button to discard them. fMSX 4.6.1 is also available from Aptoide and Opera Store.

11 July 2016

The new VGB 4.9.9 is now online. This release switches accelerated video rendering to GLES2, for better performance and upcoming special effect shaders. It also makes life easier for AndroidTV users and other people without touchscreens. Starting with this release, pressing the X button will apply changes in Cheatopedia, Cheat Editor and Palette Editor. Pressing Y will cancel changes.

7 July 2016

I have fixed an important issue in the OpenGLES2 vertex shader that prevented it from working on phones with MTK chipsets and with older Mali GPUs. The bugfix affects VGBAnext, MasterGear, iNES, and Speccy emulators, with new packages available now. Sorry for causing this problem. Please, update and let me know if there are still problems with accelerated video rendering.

6 July 2016

Recently released iNES 4.5.9 switches accelerated rendering from GLES1 to GLES2, for better performance and future special effect shaders. AndroidTV and other gamepad users will find it easier to use Cheatopedia and other iNES features, since the X button now applies changes, while Y button cancels them.

4 July 2016

The next Speccy release is now available. Speccy 4.0.9 switches video rendering from OpenGLES1 to OpenGLES2, for better performance and future special effect enhancements.

30 June 2016

Released MasterGear 3.5.8 to Google Play this morning. This release switches video rendering from GLES1 to GLES2 and adds gamepad shortcuts to make Cheatopedia, Cheat Editor, and Palette Editor easier to use on AndroidTV and other devices lacking touchscreen. Press X button to apply changes, Y button to discard them.

27 June 2016

VGBAnext 5.3, published today, switches accelerated video rendering from GLES1 to GLES2, improving performance and opening a way for special effect shaders in the future. To enable accelerated video, check the "Video | Accelerated Video" option. I am also making VGBAnext more comfortable for AndroidTV owners and other people without touchscreens. Starting with this version, most features (such as Cheatopedia) will use the X button to apply changes, Y button to discard them. Finally, I have added cheats for 10 more GBA games, including VirtuaTennis, Urban Yeti, and Wrestlemania.

22 June 2016

Released ColEm 3.7 for Android and Windows, fixing sprite collision detection and a crash in the "Input | Assign Keyboard Keys" settings page. The collision detection should now work on transparent sprites, and the lower bits of the VDP status register will contain the last tested sprite number.

21 June 2016

Just published fMSX 4.6 for Android and Windows. This release enables support for magnified sprites and fixes sprite collision detection, which is especially important for BASIC games using "ON SPRITE GOSUB" statement. Collision now works on transparent sprites, ignores off-screen sprites, and acts correctly in MSX2 screen modes. I have also fixed the Joystick Layout Editor. Controls, screen, and keyboard will no longer unexpectedly shift from where you set them.

17 June 2016

My apps are now available from Opera Mobile App Store. Enjoy! :)

Opera Mobile Store

16 June 2016

VGB 4.9.8, released this morning, adds fixes previously introduced into my other emulators. The controls placed in the Joystick Layout Editor will no longer shift to unexpected positions after you save them. Menus should now work on AndroidTV, when you press both thumbsticks inside the emulation. Finally, you can assign a custom hardware key for toggling cheats on and off.

15 June 2016

Released iNES 4.5.8 today. This release fixes problems people were having with the Joystick Layout Editor. The controls will no longer shift to different locations after you edit them. The other important fix (or a workaround, really) finally makes menus work on AndroidTV devices. Since Google disabled the normal options menu, I had to simulate it with the context menu. Press both thumbsticks to open it inside the emulation.

13 June 2016

MasterGear 3.5.7 fixes button layouts in the Joystick Layout Editor and finally enables the menus on AndroidTV. Starting with this version, the buttons will no longer shift from where you placed them on the screen. Also, since Google for some reason disabled the normal options menu on AndroidTV, I had to simulate it with the context menu. Press both thumbsticks inside the emulator in order to open it.

9 June 2016

Pushed VGBAnext 5.2.10 to Google Play this morning. It fixes several issues in the Joystick Layout Editor reported by multiple users. Starting with this release, the gamepad buttons and the screen rectangle will no longer shift, they should stay exactly where you placed them.

8 June 2016

ColEm 3.6.6 finally enables the menus on AndroidTV (at least in the emulator itself) and fixes controls placement in the Joystick Layout Editor. If you previously changed your screen layout, you may have to reset it via "General | Reset All Settings".

6 June 2016

Published Speccy 4.0.8 this morning, finally making menus work on AndroidTV. Since Google somehow disabled the options menu on their Nexus Player devices, I am now using the context menu instead. Press both thumbsticks to open it inside the emulator. I also fixed the button placement problems people were having with the Joystick Layout Editor.

2 June 2016

Here is another quick release of VGBAnext 5.2.9. In this release, I have finally managed to make the menus work on AndroidTV, by replacing the regular options menu with the context menu. This fix has been tested on my other emulator, fMSX, and found working. To open a menu inside the emulator, press two thumbsticks at the same time. Starting with this release, you can also assign the cheats toggle function to a hardware key of your choice, via the "Input | Assign Special Keys" option.

1 June 2016

fMSX 4.5.5 is now out, with another attempt to fix the AndroidTV menu. This time, I replaced the options menu (which does not show up on the Nexus Player) with the context menu (which hopefully shows up). Press both thumbsticks to invoke the menu inside the emulation. I have also added an option to control AndroidTV overscan margins, in case your device comes with the system-wide overscan setting, and made fMSX more friendly toward third party file managers, like Astro or ES File Explorer. You should once again be able to open *.ROM, *.MX1, and *.MX2 files from these file managers.

26 May 2016

VGBAnext 5.2.8, published today, fixes menu on AndroidTV devices. Remember that to open the menu, you need to press both thumbsticks down at the same time, while inside a game. Apparently, Google disabled menu functionality on all high-resolution Honeycomb+ devices in order to force developers into using its action bar stuff, but I added a workaround to get the menu back. I have also added cheats for 18 more GBC/GB games.

24 May 2016

Released VGB 4.9.7 this morning. This release adds an option to control overscan margins on AndroidTV devices. If your AndroidTV has a system-wide setting to enable overscan, you can disable VGB-specific overscan by unchecking the "General | Add Overscan Margins" option. I have also fixed interoperability with third-party file managers (like Astro or ES File Explorer) on newer Android devices. Finally, I have added cheats for 18 more games, including Lemmings, Lucky Luke, River King, and multiple Looney Tunes games.

20 May 2016

iNES 4.5.7 is now available from Google Play. It adds the "General | Add Overscan Margins" option to disable overscan on AndroidTV devices that offer it as a system-wide option. I have also fixed fast-scroll and missed clicks in the File Selector and updated the manifest to make the app more friendly toward third party file managers, like Astro or ES File Explorer.

18 May 2016

Published MasterGear 3.5.6 today, adding "General | Add Overscan Margins" option to disable overscan on AndroidTV devices. File Selector got fast-scroll index and missed clicks fixed, and I have fixed compatibility with third party file managers, like Astro or ES File Explorer, on newer Android versions.

16 May 2016

ColEm 3.6.5 comes with the "General | Add Overscan Margins" option to disable overscan on AndroidTV devices that offer it as a system-wide option. AndroidTV users should also find that virtual keypad navigation wraps when using a gamepad. The File Selector will no longer skip item clicks, and the fast-scroll index is fixed. Finally, the annoying video ads are gone from the free version.


System ROMs
If an emulator requires you to supply your own system ROMs, place them into /sdcard/AppName directory (such as /sdcard/Speccy) or directly into /sdcard directory.

To fast-forward gameplay, press and hold the on-screen FFWD button, if present. If you do not see the FFWD button, press and hold the Android SEARCH key. If your device lacks the SEARCH key, you can assign the fast-forwarding feature to a different hardware key in the Android "Settings" menu.

Built-in Menu
All emulators come with their own internal menus, offering wide variety of advanced hardware and emulation settings. The built-in menu shows up when you either press the on-screen MENU button or select "Advanced" from Android menu. You can navigate the built-in menu with the on-screen joystick or by touching menu items. To select a menu item, touch it, or press FIRE-A. To close the menu, touch outside the menu, or press FIRE-B. Remember, these are advanced settings, so be careful changing them.

Keyboard Emulation
If you need a keyboard to operate the emulator (such as fMSX), but your Android device does not have a physical keyboard, you can quickly toggle the virtual keyboard with the on-screen KEYS button. To permanently enable virtual keyboard, set "Virtual Keyboard" in the Android "Settings" menu. Notice that the modal keys (such as SHIFT, etc) can be found at the screen corners.

Network Play
In the emulators that support NetPlay feature, such as iNES or MasterGear, you can play with other users over local WiFi network or Internet. To establish connection, follow these steps:

  • Both players should be running the same game.
  • Both players should be on the same WiFi network or have externally visible IP addresses. NetPlay will not work through NAT.
  • The first player should check "NetPlay" in the menu and then choose "Become Server" option.
  • The second player should check "NetPlay" in the menu and then choose first player's name from the list of available servers.
  • Both emulators will now reset and start playing as if they were the same console with two gamepads.
  • Once you are done playing, uncheck "NetPlay" on both devices to disconnect NetPlay.

See below for FAQ and application-specific tips!


[#] Google Play Market

All my products are published on the Google Play Market. Please, do not forget to vote!

[#] EMUL8 Discussion Group

Report and discuss your problems here. You may need to create a Google account to post to this group, but you do not have to become a member.

[#] iNES for Android

iNES emulates classic NES and Famicom videogame consoles from Nintendo. It plays NES, Famicom, DiskSystem, and VS System games on your Android phone or tablet. Save game at any time and restart from that point later. You can also use GameGenie cheat codes, make screenshots and save game music in MIDI format. More...

  • Network play support
    Since Dec 4 2012, iNES supports playing over local network or Internet with other iNES users. You both have to be playing the same game and be on the same WiFi network, or have Internet-visible IP addresses.
[#] MasterGear for Android

The MasterGear emulates several 8bit videogame consoles from SEGA. It plays Master System, GameGear, Mark 2, Mark 3, SG1000, SC3000, and SF7000 games on your Android phone or target. You can save game at any time and restart from that point if you get killed, make screenshots, and even save game music in MIDI format to play it later. More...

  • Network play support
    Since Dec 7 2012, MasterGear supports playing over local network or Internet with other MasterGear users. You both have to be playing the same game and be on the same WiFi network, or have Internet-visible IP addresses.
[#] Speccy for Android (also see free version)

Speccy emulates 16kB, 48kB, and 128kB versions of Sinclair ZX Spectrum, as well as Spectrum +2, +2A, and +3, as well as Timex Sinclair models. Although I had done some ZX-related work in the past, for many years I abstained from writing a Sinclair ZX Spectrum emulator, because there were so many other Spectrum emulators around. On the other hand, it felt like a gaping hole on my resume. So, here it is, yet another Spectrum emulator, trivially named Speccy. More...

  • To change joystick type or enable mouse
    Go to the built-in menu, select "Input devices" and set whatever input device(s) you want.
  • 128k Spectrum bootup menu
    This menu can be operated with the on-screen arrow buttons, while holding CSHIFT. Believe it or not, but that is how original 128k Spectrum did it.
  • To load program from a tape (i.e. .tap or .tzx file)
    1. Select "Tape Loader" from the 128k Spectrum bootup menu or type LOAD "" (SSHIFT + J, P, P, ENTER) on 48k Spectrum to start the tape loader.
    2. Press the on-screen MENU button to go to the built-in menu and toggle the "Tape running" option to start the tape. There are also options to rewind and browse tape contents.
    3. Wait for the program to load, which may take a while, just like on a real ZX Spectrum. You can speed things up by holding the Android SEARCH key: it fast-forwards the emulation.
[#] fMSX for Android (also see free version)

fMSX emulates the popular MSX home computer from the 1980s, its MSX2 and MSX2+ upgrades, and many add-ons. fMSX is the first emulator I wrote and one of the first MSX emulators from which many others have been derived. Run your old MSX programs from disks or game cartridges on your Android phone or tablet. More...

  • To enable mouse or joystick
    Go to the built-in menu, select "Input devices" and set mouse or joystick in joystick port #1. Same goes for the second joystick port.
[#] ColEm for Android (also see free version)

While developing fMSX, I got a request to take a look at the ColecoVision videogame console. The request contained a short document on the ColecoVision internals, from which I found that ColecoVision was not much different from MSX. Thus, I got to work and in a short while made a ColecoVision emulator, later known as ColEm. More...

[#] AlmostTI for Android

AlmostTI emulates a big family of programmable graphing calculators from Texas Instruments, including TI-85, TI-86, TI-81, TI-82, TI-73, TI-83, TI-83+, TI-83+ SE, TI-84+, and TI-84+ SE. Pretty much every Z80-based TI calculator is covered. Please note that in order to run AlmostTI, you will need the system firmware ROM. See instructions on how to obtain that ROM from your own calculator. More...

  • Getting ROMs
    In order to use AlmostTI, you need at least one calculator ROM. AlmostTI comes without ROMs, as they are intellectual property of Texas Instruments. But you can dump ROM from a TI calculator you own, by following these simple instructions.
  • Naming ROMs
    On startup, AlmostTI will look for the following files in your internal storage (usually "/sdcard"):

    TI85.ROM, TI86.ROM, TI81.ROM, TI82.ROM, TI73.ROM, TI83.ROM, TI83P.ROM, TI83SE.ROM, TI84P.ROM, TI84SE.ROM, TI-85.ROM, TI-86.ROM, TI-81.ROM, TI-82.ROM, TI-73.ROM, TI-83.ROM, TI-83P.ROM, TI-83SE.ROM, TI-84P.ROM, TI-84SE.ROM

    The names can be in upper or lower case. You can always repeat the search by clicking on the "Scan Files" menu option or the magnifier icon in the action bar.
[#] VGB for Android

VGB emulates Nintendo GameBoy handhelds and their accessories. It plays GameBoy, GameBoy Pocket, GameBoy Color, and Super GameBoy games on your Android phone or tablet. VGB also supports the Pocket Printer, GameGenie cheat codes, and more. Please notice that VGB will not play GameBoy Advance games: you will need VGBA for that. More...

  • GameLink support
    As of Dec 17 2012, VGB supports GameLink emulation over a local network or the Internet. To establish connection, check "NetPlay" in the Android menu. Note that both of your devices have to have valid IP addresses. This feature will not work if one of you is behind NAT.
  • RumblePak support
    As of Mar 11 2012, VGB supports RumblePak emulation using your device's built-in vibration. Your phone will vibrate every time a game uses the "rumble" feature.
[#] VGBA for Android

VGBA emulates the Nintendo GameBoy Advance handheld. It plays GameBoy Advance games on your Android phone or tablet. Please notice that VGBA will not play classic GameBoy games: you will need VGB for that. More...

  • GameLink support
    As of Jun 13 2012, VGBA supports GameLink multiplayer emulation over a local network or the Internet. To establish connection, check "NetPlay" int the Android menu. Note that both of your devices have to have valid IP addresses. This feature will not work if one of you is behind NAT.
  • VGBA does not require GBA BIOS file
    It emulates GBA BIOS internally instead.
  • VGBA supports light sensor, tilt sensor, and RumblePak
    You can find these features used in such games as Boktai, Boktai 2, Warioware Twisted, and Drill Dozer.
  • If you are having trouble saving games
    Use the gameplay freezing feature instead. Press the Android MENU key and select "Freeze/Restore" to save your game. Later on, select the same option to restore your game back to where you have frozen it. Having said that, I would still appreciate a bug report for any game that fails saving/restoring state on its own.
  • If you are still having trouble saving games
    If you cannot save games, even with the freezing feature, and the games won't even save state when you exit and restart VGBA, you may be low on the disk space. Check how much free space you have got in the folder where your games are. There should be at least 512kB of free space for saving and freezing to work.
  • If nothing works, games do not save, cheats do not work
    Aside from using a pirated version (that is known to fail randomly, on different features) and low disk space, this problem may sometimes be caused by a package upgrade. You can fix it by completely removing VGBA from your device, then reinstalling it from the Google Play.
  • Exporting .SAV files to other emulators
    VGBA will automatically load in-game saves (.SAV) made by other emulators. As of August 7 2014, VGBA will also store in-game saves in a format compatible with other emulators. Prior VGBA versions used their own .SAV format but offered an option to export VBA-compatible .SAV files.
  • Exporting .STA/.FRZ files to other emulators
    Unfortunately, the gameplay state files are in proprietary format and cannot be exported to other emulators. Nor can VGBA load proprietary state files (such as .SGM) from other emulators.

Frequently Asked Questions





Network Play



  1. I want to report a bug or make a suggestion!

    The best ways to get help are by reporting your problem on the forum or by emailing me directly. Due to the large number of requests and limited time, I can't handhold you or help you learn how to use my apps. I can only help you if you have found a geniune bug and can explain what it is in clear terms. Generally, it takes a week or two to resolve most issues, unless I am sick, busy, or you are asking about something way over my head.

    Also note that reporting problems in a Google Play review is not very helpful, as it makes more difficult for me to respond to your complaint and clarify what the problem is. Adding negative rating to your Google Play feedback makes it almost certain that I will not waste my time trying to help you. Thus, start by using the forum or emailing me to get help.

    To make my job easier, make sure you...

  2. I want games! I need games! Where do I find games?

    You can find a huge collection of public domain games for old game consoles at the PD ROMs web site. For both legal and ethical reasons, I cannot and will not tell you where to download commercial games for running them with my emulators, even if you email me about it. If you really need to, use an Internet search engine instead. Please, do not download and run any software that you do not already own (i.e. legally bought a cartridge with the same game). It is the right thing to do.

  3. Nothing works, saves fail, everything hangs or crashes!

    Aside from using a pirated version (that is known to fail randomly, on different features) and low disk space, this problem may sometimes be caused by a package upgrade. You can fix it by completely removing emulator from your device, then reinstalling it from the Google Play.

  4. I have bought the app, but now it says I do not have a valid license!

    To protect against piracy, I had to introduce the Google Play license check into commercial versions of my Android apps. Every now and then, the license check will use the Google Play Store app on your device to see if you have actually bought my app. This operation is completely transparent to the user, unless it fails. My statistics show that license checks fail for about 3% of people. In order to stay in the other 97%, make sure that

  5. I cannot save games and screenshots do not show up either.

    The two most common reasons are lack of free disk space and active USB connection to a computer that locks your storage from changes. Also, starting with Android 3.2+, Google essentially disabled writing to the external SD card. This means that if you place emulator files to the external SD card, emulators may not be able to save game states or screenshots. If you encounter this problem with your device, avoid it by always placing files to the internal SD card.

  6. Do your emulators work on rooted devices?

    All my applications run normally on rooted devices. There is a catch though. If you have a rooted device with LuckyPatcher or some other cracking tool installed, my products will not run on your device. You always have a choice of removing the pirate tools: once they are gone, my applications will run, whether your device is rooted or not.

  7. Emulator is too slow. How do I make it faster?

    First of all, my emulators will always try to mimic the actual hardware speed. You can easily verify that by enabling the "Video | Show Frame Rate" option and noting the "fps" value at the top-left screen corner. As long as this value stays close to 60fps (50fps for PAL hardware like ZX Spectrum), your speed is just fine. If you still want emulation to run faster than that, disable the "Video | Sync Display" option and watch things take off.

    Let us now suppose that you are not getting the optimal speed. The emulation speed generally depends on your hardware, the other software you are running, and your emulation settings. Follow these simple steps to improve the speed:

  8. How can I make fast-forward stay on all the time?

    To make FFWD button a toggle switch, enable "General | Persistent Fast-Forward" option. Please note that if you are trying to play games with fast-forwarding always on, you may be better off following performance improvement advice instead.

  9. How do I remove the title bar from the top of my screen?

    To quickly toggle the title bar, place your finger at the middle of the screen and flick it up to the top to hide the the bar. To make the title bar reappear, flick your finger down from the top of the screen. You can also choose to hide the title bar on startup, by enabling the "General | Hide Title Bar" option. This will also hide the menu though. To get the menu back, flick your finger down the screen.

  10. When I rotate my Gingerbread device, the picture disappears!

    There appears to be a bug in Android 2.x (Gingebread) that breaks OpenGLES views when you rotate the device. Starting from August 2013, all my emulators come with a workaround for this bug. So, if you are experiencing this problem, head to Google Play and download the latest version of my app.

  11. When I use video acceleration, the picture becomes fuzzy.

    When scaling pictures, the OpenGLES hardware always adds a bit of blur, to avoid ugly scaling artifacts. If you do not like the fuzzy picture, disable the "Video | Hardware Video Acceleration" option for the crystal clear image, at the cost of lower performance and shorter battery life.

  12. The picture does not fill the screen.

    When not using hardware video acceleration, the emulator will scale picture with the highly optimized assembler code running on your main CPU. This code is tailored for several different screen resolutions. The emulator will choose the resolution that best matches your screen, but may not completely fill it. If you would like the picture to fill your whole screen, enable the "Video | Hardware Video Acceleration" option.

  13. Colors look wrong. I want to change them.

    Several emulators, such as iNES and VGB, let you change the color palette to the one you like. In order to make a custom color palette for a game named Game.nes or, create a text file named Game.pal with 64 (for iNES) or 16 (for VGB) color definitions in the RRGGBB format, one per line. If you want to have the same custom palette for all the games, place it into /sdcard/iNES/iNES.pal or /sdcard/VGB/VGB.pal instead. Here is a sample VGB palette file:

    FFFFFF ; Normal colors
    FFFFFF ; Background colors
    FFFFFF ; Sprite colors
    FFFFFF ; Window colors

  14. Sound lags. How do I prevent it from lagging?

    If you feel that the sound lags on your device (i.e. you hear shots a little bit after pressing the fire button), try decreasing the "Audio | Audio Latency" setting. Reducing it too much may cause sound distortions though, so be careful. If your audio becomes distorted, increase the latency. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  15. Sound clicks and pops. How do I clean it up?

    If you are hearing clicks and pops in the sound, increasing the "Audio | Audio Latency" setting should fix your problem, at the cost of some sound lag. If the sound issues persist, set "Video | Frames to Draw" setting to 35%, or enable "Video | Hardware Acceleration" option to speed up display updates. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  16. Sound repeats, like an echo. How do I fix it?

    The echo often occurs on slower devices, where emulation cannot keep up with the audio, so the audio repeats, while emulation catches up. You can avoid this problem by optimizing performance to make emulator run faster. If the sound still echoing, increase the "Audio | Audio Latency" setting. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  17. I cannot press more than two virtual buttons at once. How do I fix it?

    A lot of Android devices have limited multitouch that only lets you use two fingers. On these devices, you simply cannot press more than two virtual buttons at once. My emulators offer a workaround of sorts though. Go into the "Input | Edit Layout" setting and drag buttons so that they overlap a little bit. Now, you can press both buttons by touching the overlapped spot.

  18. Virtual joystick buttons are too small, too big, or awkwardly placed. How do I change them?

    To resize joystick buttons, open the "Input | Virtual Joystick Size" setting and choose any size you like. To move buttons, open the "Input | Edit Layout" setting and drag buttons around the screen to the most comfortable spots. Keep in mind that when you rotate your device, each button will "stick" to the closest screen edges.

  19. Virtual joystick buttons obscure my screen. Can I change them?

    Normally, you will see transparent controls overlaid on top of the display. To change their opacity or hide the controls altogether, use the "Input | Virtual Joystick Opacity" and the "Input | Virtual Joystick Shape" settings. You can also control the joystick by physically tilting your device, if your device has an accelerometer and you enable the "Input | Tilt Joystick" option.

  20. Can I set my own virtual joystick images?

    In my apps, released after August 14 2015, you can supply your own virtual joystick skin. Make a Controls.png file using the image at the right as your template, then stick it into the emulator-specific folder, like /sdcard/iNES or /sdcard/VGB. Then go into "Settings | Input | Edit Joystick Layout" and select "Custom Skin" as the joystick shape.

  21. Does joystick have auto-fire? How do I enable it?

    See the "Input | Auto Fire Settings" setting. It lets you choose what buttons are going to have auto-fire.

  22. Can I use my keyboard, gamepad, or Xperia Play keys?

    Of course you can use your generic keyboard, gamepad, or joystick with any of my emulators. If your gamepad has a mode switch, make sure it is set to the "generic gamepad" position. You may also want to visit the "Input | Assign Keys" setting in order to make a comfortable button layout for yourself. By default, your keys are going to be assigned as follows:

    EmulatorKeyboardGamepadXperia Play
    FIRE-LQ, E, T, U, OL1L
    FIRE-RW, R, Y, I, PR1R

  23. I have a PowerA MOGA controller. Will it work?

    Starting Feb 26 2013, all new releases of my emulators natively support MOGA gaming controller. Simply turn it on, and once you see the "MOGA controller connected" message on the screen, it is ready to play with. You can still use MOGA with older versions of my products with the help of the free universal MOGA driver available from Google Play. This little app should let you use the MOGA with many applications that do not normally support it.

  24. I have an iCade joystick. Will it work?

    Starting Apr 5 2013, all my emulators support iCade joysticks. To enable iCade support, toggle the "Input | iCade Support" option. You may also want to customize the button layout via the "Input | Assign Keys" setting.

  25. I have a Sony Sixaxis gamepad. Will it work?

    If you have got a Sony Sixaxis gamepad and a rooted Android device, you can use the gamepad over Bluetooth, with the help of the Sixaxis Controller app from Dancing Pixel. See the application web site for instructions.

  26. I have a Nintendo Wiimote controller. Will it work?

    For Nintendo Wiimote users, here is a short tutorial on using Wiimote with my applications, provided by Robert McCurdy.

  27. How do I use NetPlay?

    Most of my emulators now support the NetPlay feature that lets you play with other users over your local WiFi network or the Internet. To establish connection, follow these steps:

  28. I do not see the other player's device.

    In order to use network play, both players must be running the same game and have mutually visible IP addresses. It is only possible if

    You will not see each other in the NetPlay dialog, unless these conditions are met.

  29. What is GameLink and how is it different from NetPlay?

    Unlike stationary consoles which came with a pair of gamepads, the GameBoy and GameBoy Advance handhelds had a special serial cable that let users connect 2-4 handhelds together, for cooperative play. This cable is known as the GameLink and supported in my GameBoy emulators, VGBA and VGB. The GameLink connection works exactly the same way as a regular NetPlay connection.

  30. Why does emulator slow down when using NetPlay?

    When using NetPlay, each player must send a lot of data over the network and wait for the other player to acknowledge every packet they send. This wait time slows down the gameplay speed for both players. The wait is slightly worse for GameLink (in VGBA and VGB) because the data needs to be sent more often. While this slowdown is unavoidable and depends on your network speed, I am working to reduce it in the upcoming versions of my products.

  31. My cheats do not work.

    Many games are available in different versions, in different languages, or with bugfixes. In order for a cheat code to work, you need to be running exactly the same version of the game that this cheat code has been discovered for. The codes will not work for a different game version, even on the real GameShark or ActionReplay hardware. Besides, many cheat codes found on the Internet contain errors and will not work on any game version. Given how unreliable cheats are to begin with, I usually can't answer the question why your cheat does not work.

  32. I cannot enter any cheat codes. No matter what I do, they do not work.

    The easiest way to use cheat codes is by going to Android menu and choosing "Cheats | Cheatopedia" there. Cheatopedia contains premade cheats for many popular games.

    To enter cheats manually, go to the Android menu and choose "Cheats | Edit Cheat Codes". Use the cheat editing interface to add, delete, or edit cheat codes. The editor will not let you enter a code unless your code strictly follows one of the relevant formats:
    GBA ActionReplay or GameShark XXXXXXXX XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    CodeBreaker or GameSharkSP XXXXXXXX XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    GB/GBC GameGenie XXX-XXX-XXX "X" = digit from "0" to "9" or letter from "A" to "F".
    GameShark XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    NES GameGenie XXXXXX or XXXXXXXX "X" = letter from "A" to "Z".
    ActionReplay XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F", the first two digits are usually "00" or "01".
    SMS/GG GameGenie XXX-XXX or XXX-XXX-XXX "X" = digit from "0" to "9" or letter from "A" to "F".
    ActionReplay XXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    CV Memory POKE XXXX-XX or XXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    MSX Memory POKE XXXXXXXX-XX or XXXXXXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".

    Please note that emulators will only accept cheat codes in the above formats (whatever ones are relevant). They will not accept codes in any other formats. So, if you cannot enter a code, carefully check its format. Finally, be aware that not all cheats you find on the Internet work, even on the real hardware. Never mix cheats from different sources and try to use cheats that are known to work on at least some other emulator.

  33. How do I search for cheats in any game?

    Most of my emulators include the Cheat Hunter tool letting you search for your own cheats in any game. To use the tool, follow these simple steps:

  34. I want to add my own cheats to the Cheatopedia.

    Yes, you can extend Cheatopedia with your own cheats. In order to do that, you will have to place a text file called custom.chts into emulator-specific folder: /sdcard/VGBA, /sdcard/VGB, or /sdcard/iNES. This file should have the following format:

    [(Custom Cheats)]
    Menu=Game 1
    Menu=Game 2
    [Game 1]
    Menu=Cheat 1
    Menu=Cheat 2
    [Cheat 1]
    12345678 9ABCDEF0
    87654321 0FEDCBA9
    Instead of adding single-line cheats separately, you can also use a shortened notation for them:
    [Game 1]
    Code=5A5A5A5A 23232323 : Cheat 1
    Code=76767676 01010101 : Cheat 2
    Once you are done entering cheats and place custom.chts file into proper folder, you should be able to access your custom cheats from the top Cheatopedia menu by clicking on "(Custom Cheats)".

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