Subject: Re: Zilog scc drivers
To: Jonathan Stone <jonathan@DSG.Stanford.EDU>
From: Bill Studenmund <skippy@macro.stanford.edu>
List: port-pmax
Date: 03/13/1996 17:31:41
On Wed, 13 Mar 1996, Jonathan Stone wrote:

> Bill,
> 
> I don't think your 2nd paragraph is true.
> 
> NetBSD/pmax doesn't yet use the "machine-independent" z8350 driver;
> it still has the 4.4bsd/pmax SCC driver, much hacked my cgd and I.
> Only ralph & rick would know for sure but the pmax SCC driver bears no
> resemblance to any sun driver I've ever seen.

Doh! You are correct.

> Anyway, I'm driving a Metricom radio "modem" [sic] very happily at 57600
> from a 5k/240, and it would run happily at twice the speed if the
> damn chip could clock bytes at 115.2, which it can't.  There may
> be problems on a slower CPU, unless and until the DMA support
> on the IOASIC is used.

I think there are some tricks you can play. I'll EMail you about them. :-)

Take care,

Bill