Subject: Re: serial 56k?
To: Bill Studenmund <wrstuden@nas.nasa.gov>
From: Hauke Fath <hauke@Espresso.Rhein-Neckar.DE>
List: port-sparc
Date: 11/13/1999 11:12:54
At 22:53 Uhr +0100 12.11.1999, Bill Studenmund wrote:
>On Thu, 11 Nov 1999 svinto@ita.chalmers.se wrote:
>> the print-server i'm using today is an old Macintosh SE/30 also
>> running NetBSD 1.4.1 which works like a charm, only it's a bit slow.
>> if i'm not mistaken both these machines use the same serial chips. so
>> why can the Mac do 56k but not the Sparc? or am i missing something
>> here?
>
>While the two machines use the same serial chip, they DON'T use the same
>clock frequency to drive the baud rate generator. The Sun machines
>actually use a slightly higer clock rate. The net result is that the
>highest two baud rates the mac can support are 57600 and 38400, which for
>suns they are 76800 and 51200.

Make that 115200 and (theoretically) 230400 for mac68k after Scott's recent
changes. These two may be of pretty restricted value, but see PR#8070.

	hauke


--
"It's never straight up and down"     (DEVO)