> It was originally a Zilog chip designed to mate with the Z80 --- 

Ah.  That's why "AMD" didn't seem right.  Thanks for the correction.

> It shouldn't require any special code to support a deeper FIFO 
> because I think the status flag/interrupt was just on Tx empty and on 
> Rx available.

I think that's right, too, although there might be something required
in setup to enable the non-standard features.  I haven't looked at the
driver in a while, and never did anything with that part (85230?).

-allen

-- 
 Allen Briggs                     briggs@wasabisystems.com
 http://www.wasabisystems.com/    Quality NetBSD CDs, Sales, Support, Service