>All ports which use the z8530 or equivelents (sun, sparc, mac68k, pmax,
>and atari) are currently using drivers based on an origonal sun or sparc
>driver. These drivers are now very solid on the mac; people have gotten ppp
>to run at 57600 reliably

I'm not intimately familiar with these chips, but the Zilog chips that
Sun uses can't really keep up at >19.2k, which is increasingly a pain.