Intellivision System Changer

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Atari 2600 game adapter module for Intellivision

By default, only compatible with Intellivision II units. A modification for the 2609 Master Component (and possibly other revisions) is detailed below.

Capacitor List

??	4.7uF	25v (axial)
C2	4.7uF	25v (radial)


Compatibility for other Master Component revisions

Provided courtesy of Intellivision Lives / Blue Sky Rangers

A pictorial version is available at Intellivision.us


2609 MASTER COMPONENT MODIFICATION FOR PORTOFINO EXTERNAL VIDEO, January 13, 1983

REMOVE
R23, 300 ohm 1/4W resistor
R24, 3K ohm 1/4W resistor
CUT FOIL
COMPONENT SIDE
At the pad for R24 on the end that leads to Pin 1 of the RF modulator.
FOIL SIDE
Cut the foil attached to J1, Pin 2.
Cut the foil at the pad for R3 (22K ohm 1/4W resistor) that leads to Pin 1 of the modulator.
INSTALL THE FOLLOWING
COMPONENT SIDE
A 1N914 diode with .250" length of sleeving on the anode lead. Anode lead to the foil leading to Pin 1 of the modulator using the feedthrough hole on this trace. The cathode to the pad for C33 (the pad at the end of the foil leading to R3).
A 1N914 diode across the cut foil of 2.1 above, with the cathode to the pad for R24.
A 2" length of insulated jumper wire from the cathode of diode CR8 to the junction of the foil between R3 and R9.
FOIL SIDE
A 6" length of coax, #RG174/U, stripped 1/4" at each end. Shrink sleeve insulate exposed braid on one end and solder center conductor to J1 Pin 2 (i.e. braid is not connected). Other end solder braid to ground foil at C33 and center conductor to cathode of new diode installed at 3.1.2 above.