CMC Easy I/O - Parallel/Serial Board  

 

  

 

 

 

 

 

For such a monumental offering of features, the fabled Parallel/Serial interfacing from an Atari 800 expansion card vs the SIO bus.  The Easy I/O gets almost no mention or notice within Atari circles.  A brief mention in an Atari Magazine was about the only public acknowledgement of this incredible device.

Sadly the reason is, that only just a few were ever made and none have ever surfaced since the company closed in 1986.

Designed by an Atari engineer on the side, named Dave Sheppard, these boards would've changed the entire way the Atari 800's could've been used by having so much flexibility from a Bus card device vs an SIO driven device.

Other versions such as a Parallel only board and an External Modem were mentioned, but again, they sadly never materialized.