On 5 Feb 2010 at 23:14, Ben wrote: > Chuck Guzis wrote: > But there really is no good reason to use an 8255, a Z80 PIO, a 6820 > > or even a 6522 in a new design today, other than for nostalgia's > > sake. > > So what do you recomend? What do you need to do? Programmable logic can be configured to do whatever you need. --Chuck