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Koen Vaartjes Video Mod

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The Koen Vaartjes Video Mod is a hardware modification applicable to a Color Computer 1 or 2, for adding composite video output. The mod was designed by Dutch CoCo enthusiast Koen Vaartjes. Individual orders for the mod were assembled by Koen Vaartjes and accompanied with mounting instructions. These instructions are shown and translated on this page. A scan of the original document can be downloaded here.

Original text

Original Dutch English


Dit is de "layout" van het nieuwste CoCo videobuffer, gemaakt d.m.v. "SMO" techniek. De werking is identiek aan de vorige versie. Omdat het printje aan de onderzijde geÏsoleerd en vlak is, kan het zondermeer met lijm op b.v. de UHF modulator (blikken doosje) gemonteerd. De zwarte massa draad komt dan aan het blik vast (solderen). Het aan u geleverde printje is voor kleur bedraad en getest.

Veel succes met de inbouw.

Met vriendelijke groeten,



This is the layout of the latest CoCo videobuffer made using SMO technique. The functioning is identical to the previous version. Because the print is isolated on the bottom side and is plain, it can easily be mounted onto the UHF modulator (metal box) with glue. The black grounding wire is then fixed to the metal box (by soldering). The print delivered to you has been color-wired and tested.

Good luck with the mounting!

Kind regards,



uitg. amplitude outgoing amplitude
beeldkwaliteit picture quality
Voor kleur: Verbinding tussen de twee pennen M en K verwijderen. Kleursignaal input op K. For colour: Remove connection between the two pens M and K. Colour signal input on K.
Voldoende ruimte houden of isolatieplaatje gebruiken. Keep sufficient distance or use isolation.
Soldeerlip Solder lug
Soldeerlip ombuigen en aan print plus UHF mod. solderen. Bend solder lug and solder to print and UHF modulator.

(here the original text of the document will come plus translation)