MITS 2SIO serial chip?

From: Peter C. Wallace <pcw_at_mesanet.com>
Date: Fri Dec 14 13:28:08 2001

On Fri, 14 Dec 2001, Gene Buckle wrote:

> > NS* did use them as did many others. The worst chip was
> > the 8250.
>
> Which makes me wonder what possessed IBM to pick it for the PC.
>
> g.
>
>
>

The same reason they chose active high edge triggered interrupts on the
bus (wrong on both counts)

The same reason they used 8 bits of an 8255 to read the KB shift register
that had a (unused) tri-state

The PC = A horrible, amateurishly designed kluge


Peter Wallace
Received on Fri Dec 14 2001 - 13:28:08 GMT