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A libretro emulation core for the Mattel Intellivision designed to be compatible with joypads from the SNES era forward
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README.md

FreeIntv

FreeIntv is a libretro emulation core for the Mattel Intellivision designed to be compatible with joypads from the SNES era forward even if they originally required a number pad.

Authors

FreeIntv was created by David Richardson.

License

The FreeIntv core is licensed under GPLv3. More information at https://github.com/markwkidd/FreeIntv/blob/master/LICENSE.

BIOS

FreeIntv requires two Intellivision BIOS files to be placed in the libretro 'system' folder:

Function Filename* MD5 Hash
Executive ROM exec.bin 62e761035cb657903761800f4437b8af
Graphics ROM grom.bin 0cd5946c6473e42e8e4c2137785e427f
  • BIOS filenames are case-sensitive

Entertainment Computer System and Intellivoice

FreeIntv does not currently support Entertainment Computer System (ECS) and Intellivoice functionality. Contributions to the source are welcome!

Controller overlays

Mattel Intellivision games were often meant to be played with game-specific cards overlaid on the numeric keypad. These overlays convey information which can be very useful in gameplay. Images of a limited selection of Intellivision titles are available at: http://www.intellivisionlives.com/bluesky/games/instructions.shtml

Controls

RetroPad FreeIntv Function
D-Pad 8-way movement
Left Analog Stick 16-way disc
A Left Action Button
Y Top Action Button
X Use the Last Selected Intellivision Keypad Button (see Mini-Keypad below for more information) - In Astrosmash, for example, you can leave "3" selected to enable instant access to hyperspace.
L/R Show Intellivision Mini-Keypad which allows you to view and select keys from a small Intellivision pad in the lower corner of the display.
Start Pause Game
Select Swap left/right controllers - Some games expect the left controller to be player one, others expect the right controller. This isn't a problem if you have two controllers (and don't mind juggling them) but users with only one controller or using a portable setup would be effectively locked out of some games. Pressing select from either controller with swap the left controller for the right and vice-versa.