> Date: Fri, 14 Jun 1996 16:36:18 -0400
> From: "Ozan S. Yigit" <oz@border.com>

> has there been any improvements to the netbsd zs driver so it can
> keep up with 38400? i cannot keep an ipc talking through an accura 288
> without several dozen fifo overflows per hour...

If anyone wants to consider porting the code in:
	sys/dev/ic/z8530*
	sys/dev/sun/*
to the sparc that might help.  Lots of work has been done
on that code to make hardware flow control reliable.  That
required handling flow control events in the high-priority
interrupt level instead of waiting for a softint to before
the driver drops RTS (way too late).

With the latest version, even a poor old, slow, sun3 can avoid
dropping any input at 38.4 if crtscts is turned on.

The sun3 code is just a reorganized and improved version of the
sparc code, so a port back to the sparc should be very easy.

Gordon