History

A while back I was asked by a friend to help in a project to connect an arcade board to a large screen TV. After some experimentation a board was designed and built which took the RGB  & sync outputs from a normal JAMMA game ( and non-JAMMA games too ) and encoded it into a video signal to connect the board to a TV.

I'm now offering this to other 'Arcade Hobbyists' who might find the idea of connecting games to a TV fun or useful.


What does it do ?

This unit will convert the Red, Green and Blue video signals coming out of a video game and convert it into the composite NTSC video, or S-Video, output.

It allows you to plug a Video arcade game board into a regular TV receiver that accepts video, or S-Video input, in the NTSC encoding format.

This board ONLY works with standard resolution boardsets ( 15kHz horizontal line frequency ) it is not designed for medium resolution games.

The board is now available please mail me for exact details.
Click to E -Mail Jrok for details 

Inputs

RGB ( Red Green and Blue )  1V peak-to-peak signal,  3 adjustments are provided to match input levels from the game board to the converter.

Composite Sync  - Negative composite sync.

Single 5V DC power supply  - can be powered off the game board

Output

NTSC composite Video
S-Video compatible

Note: this is video output NOT modulated VHF/UHF

Controls

Horizontal screen centering adjustment.

This allows the center of the screen to easily be adjusted without need to alter the television settings. Certain games have the center of the screen adjusted to far left or right.

Dimensions

4 inches x 3 inches, mounting holes are 3.5 and 2.5 inches spaced, 1/4 inch from the board edges.

Compatibility

Because this converter 'cleans' up the incoming video signals and synchronization, to meets the exacting tolerances required for display on  a normal NTSC television receiver, the unit will work with almost every video game that gives out a composite sync and RGB signals.

This includes games which use very wide screens, also known as overscan.

A brief list of tested games

Williams : Mortal Kombat, Smash TV, NB JAM
Capcom : CPS 1/2, Street Fighter, Buster Bros.
Nichibitsu: Terra Cresta, Moon Cresta, Legion, Mag Max
Namco: Mappy, Dig Dug, Pacman, Air Busters
Universal: Mr.Do, Wild Ride, Castle
Midway: Galaxian, Moon Cresta, Gaplus, Galaga, Bosconian
Tekhan: Bombjack
Nintendo: Popeye, VS, Mario Bros *

NOTE:  * required additional video invertor