In a message dated 98-01-29 20:10:54 EST, you write: << Can I run a 16C84 at 20 Mhz? If not what is the fastest speed for proper operation ? Jon >> Hi Jon, 10MHZ is the fastest the book says. You might be able to squeek a few more MHZ but 20mhz might be pushing it a little. Dave Duley