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Sega Genesis

Overview

The Sega Genesis application is an emulator for the Sega Genesis game console.

Omega Blast by Nendo

Controls

The emulator supports up to two controllers. The keyboard and gamepad mappings are listed in the tables below.

Keyboard

Keyboard support is only available for controller one.

Name
Keys
 Comments
Move
A
B
C
X
Y
Z
Start
Mode The Right Shift Key.
Show Pause Screen

Gamepad

Gamepad support is available for both controllers.

Name
Gamepad
 Comments
Move  or 
A
B
C
X
Y
Z
Start Not available for Xbox and not recommended for iOS (see alternate)

Press the Menu (Start) Button.
Start
(Alternate)		  and  Hold down the Right Trigger and click (press down) on the Right Thumbstick.
Mode Not available for Xbox and not recommended for iOS (see alternate)

Press the View (Back) Button.
Mode
(Alternate)		  and  Hold down the Right Trigger and click (press down) on the Left Thumbstick.
Show Pause Screen  and  Not available for Xbox and not recommended for iOS (see alternate 3 or 4)

Hold down the Left Trigger and press the Menu (Start) Button.
Show Pause Screen
(Alternate)		  and  Not available for Xbox and not recommended for iOS (see alternate 3 or 4)

Hold down the Left Trigger and press the View (Back) Button.
Show Pause Screen
(Alternate 2)		  and  Not available for Xbox and not recommended for iOS (see alternate 3 or 4)

Hold down the X Button and press the View (Back) Button.
Show Pause Screen
(Alternate 3)		  and  Hold down the Left Trigger and click (press down) on the Left Thumbstick.
Show Pause Screen
(Alternate 4)		  and  Hold down the Left Trigger and click (press down) on the Right Thumbstick.

Battery-backed SRAM

Some Genesis include battery-backed SRAM as a means of preserving state between sessions. The Genesis application supports persisting this SRAM state into the browser's local storage or optionally to cloud-based storage. The SRAM contents will be persisted whenever the pause screen is displayed (or the game is exited). Therefore, the menu should be displayed periodically for games that support battery-backed SRAM to ensure the state is properly persisted.

Feed

This section details how Genesis application instances can be added to feeds.

Type

The type name for the Genesis application is genplusgx-md.

Note

The alias genesis also currently maps to this application. In the future, the genesis alias may be mapped to another Genesis application (different emulator implementation) if it is determined to be a more appropriate default.

Properties

The table below contains the properties that are specific to the Genesis application. These properties are specified in the props object of a feed item.

Property Type Required Details
pal Boolean No Whether to force PAL video mode for the specified ROM.
rom URL Yes URL to a Genesis ROM file or a zip file containing a ROM file.
pad3button Boolean No Whether to use 3-button control pads (6-button is the default).
zoomLevel Numeric No A numeric value indicating how much the display image should be zoomed in (0-40).

This property is typically used to hide the black borders that are present on some games.

Example

The following is an example of a complete feed that consists of a single Genesis application instance (type value of genesis). The rom property value is a URL that points to a Dropbox location that contains the excellent homebrew game Ixion by Nendo.

{
  "title": "Genesis Feed",
  "longTitle": "Sega Genesis Example Feed",
  "categories": [
    {
      "title": "Genesis Games",
      "longTitle": "Sega Genesis Games",
      "items": [
        {
          "title": "Ixion",
          "type": "genesis",
          "props": {
            "rom": "https://dl.dropboxusercontent.com/s/qv4vpzny6zqncmx/ixion.bin"
          }
        }
      ]
    }
  ]
}

This example can be tested by adding a feed with the following URL within the webЯcade player:

https://tinyurl.com/sample-genesis-feed

References

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