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Introduction Inspiration for this mode I found on Daryl's Computer Hobby Page. Daryl made Composite Video Text/Graphics Display based on ATMEGA8 and drive by VIA6522. This article will show how to build, assembly and connect VIA 6522 IC to Atari and use 2 additional 8-bit parallel ports and serial interface. This is my own project build from scratch but it's nothing modern - this IC was used in C64 to communicate with disk drive. It will be used as additional PIA for manage other equipment.

Why? Well, on the market you may find a few sellers which have VIA6522, but...

• this IC is discontinued, don't wait so much time, buy it!
• it's still very useful and may be good alternative for PIA 6520(6521).
• topology and registers covering PIA 6520, so you may use it as equivalent for it. (some pins should be swapped)
• very cheap IC (~2$/piece).

Best sources Original source: https://systemembedded.eu/viewtopic.php?f=28&t=41