blazeentertainment/freeintv

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

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. The PSG and STIC emulation was made closer to hardware and optimized by Oscar Toledo G. (nanochess), who also added save states.

The Intellivoice code has been contributed by Joe Zbiciak (author of jzintv), and adapted by Oscar Toledo G. (nanochess)

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

FreeIntv does not currently support Entertainment Computer System (ECS) functionality. Contributions to the code 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

• Mini-Keypad - allows the user to view and select keys from a small Intellivision pad in the lower corner of the display.
• Controller Swap - Some Intellivision 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. Controller Swap swaps the two controller interfaces so that the player does not have to physically swap controllers.

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. In Astrosmash, for example, you can leave "3" selected to enable instant access to hyperspace.
L/R	Activate the Mini-Keypad
Start	Pause Game
Select	Controller Swap

Todo

• Some games won't work well with modern game controllers without a keypad. These games have been remapped to facebuttons to be functional like Night Stalker, however these fixes are currently achieved with #IFDEF's. Need to replace these IFDEFS with some form of decent game detection so it automatically sets these new mappings.