In this video tutorial, we see how to connect two Monitors to the Commodore 128, using the RGBI output, in addition to the video output. The Commodore 128 is, in fact, equipped with a second graphics chip, the VDC, whose signals come out on the rear RGBI port. The RGBi port can be connected to an RGBI or CGA color monitor, plus it has a pin with a black and white composite video signal. 0:00 Connect two Color Monitors to the Commodore 128? 1:04 The first step in connecting two Color Monitors to the Commodore 128 is to build an adapter to connect the RGBI port to a VGA color monitor (which supports 15KHz signals). We solder all the components on the printed circuit: the resistors, the capacitors, the sockets for the integrated circuits, the connectors. 12:15 How to connect Monitor 1 to Commodore 128 via S-Video cable. How to connect the RGBI (CGA) to VGA Converter to the Commodore 128 and monitor 2. The Converter needs an external 5V power supply. 13:45 The example program in Basic to manage two monitors with the Commodore 128. The commands in Basic GRAPHIC and COLOR to manage the two monitors and change the colors of the texts. All the details of the experiment, as well as the example file in Basic to manage two monitors with the Commodore 128, are available by following this link (in Italian): https://www.valoroso.it/collegare-due-monitor-al-commodore-128-uscita-rgbi/ If you like experiments, reviews, and tutorials related to retro computers, I invite you to subscribe to the YouTube channel and activate the notification bell! You can find more experiments, reviews and articles on my website (in Italian): https://www.valoroso.it/category/retrotecnologia/ Credits: in the video tutorial, SID music is Rob Hubbard's ACE II. #Commodore128 #Commodore #Basic #8bit #RGBI