Date   : Sun, 29 Jul 2007 10:44:45 +0100
From   : info@... (Sprow)
Subject: Comms software

In article <46AC5F23.2080907@...>,
   Andrew Benham <adsb@...> wrote:
> gARetH baBB wrote:

> > Hardware flow control is not really the problem, the OS buffering system 
> > and IRQ setup is just too slow to cope with 19200 bytes/s.
>
> I think the missing text here is 'sustained use at'.  The BBC can't
> send 19200b/s at a rate that saturates the serial link (i.e. there
> are inter-character gaps), and it can't keep up with receiving a
> saturated 19200 link.

Isn't that why you can set the handshake threshold with OSByte 203?
Presumably a reliable link can be achieved by increasing this value from its
default of 9 to (say) 18 or higher?
Sprow.