Hi Andrew (Andrew Warren), in <199708200449.XAA08360@dfw-ix7.ix.netcom.com> on
 Aug 19 you wrote:

> Actually, sharing the oscillator doesn't buy you any speed; you can
> go just as fast with separate clocks as you can with a single clock.

You need start/stop bits then, or a dedicated clock line.  We're talking
about a 1 wire transmission.