BIT-C-128 Video DAC for Commodore 128/128D, IBM CGA, and Tandy CGA Plus

The BIT-C-128 Video DAC with a Gonbes video converter and power adapter is the cheapest and easiest combination to display high-quality 80-column video from a Commodore 128 or IBM CGA on newer VGA displays, including lightweight LCD flat panels.

Designed especially for Commodore 128 and 128D computers, the BIT-C-128 Video DAC has been carefully tuned to match the colors on the Commodore 1084S-D display and designed for manufacturing using modern design tools and surface-mounted components.

Key features:

Please see the links at the top of this page for more information about applications and how to get started, or to buy the video DAC and accessories.

For questions about this product, please contact me (John Carlsen).


2019 October 1: There will be a shipping delay while I will be out for over a week, and no new orders will ship until after I return. Please do not select priority shipping until after October 14. Thank you for your patience!

2019 January: I added a brief survey. Would you please give a little feedback on what you like and what you would like? Thanks!

2019 January: Also added instructions on how to convert to HDMI.

2018 October-November: The BIT-C-128 Video DAC circuit board is now in its fifth printing. Thank you for making BIT-C-128 the world's best selling video DAC for Commodore 128 and IBM CGA!

2018 January: United States postal rates increased again on January 21, causing slight increases to some delivery prices.

2017 April-May:

2016 June: To celebrate its first anniversary, I'm publishing a 3-D PDF design proof of the BIT-C-128 Video DAC that I created a year ago. This file contains a three-dimensional model that may be viewed and turned in three dimensions with a modern Adobe PDF reader. (Older versions will display only a white page.)


Details of the key features:

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