Subject: Re: baud rate restrictions on vaxstation 3100
To: Aaron J. Grier <>
From: None <ragge@LUDD.LUTH.SE>
List: port-vax
Date: 07/01/2003 21:22:47
> On Tue, Jul 01, 2003 at 02:35:38PM -0400, Lord Isildur wrote:
> > can a vs3100 _do_ 38400? i though it , like the DS3100, had a weird
> > clock that didnt divide evenly even to 19200, much less 38400.. 
> dc(4) has the restrictions.  it doesn't look like dz(4) does, though,
> and I don't find any attachments for dc(4) in vax configuration files,
> even though the dc(4) manual page mentions the VAXstation 2000 and 3100.
> (should I file a PR?)
Actually, the man page mentions DECstation 2000 and 3100, not the
VAXstations.  But the programming interface is the same (DZ11-style).
The DZ11 cannot do higher speed than 9600, but the clone chips and
some of the devices (like DZQ11) can do higher.  The same 19800 
problem is in the VS31k DC367 chip as in the DC7085 version. They 
cannot do higher speeds though.

> maybe dc was used with vaxen in the past, but it looks like dz is used
> now.
VAXen have used the dz driver ~forever and the pmax port used the dc
driver. This is an accident by history, it should be fixed.

> maybe andrew or ragge can shed some light.
Feel enlighted :-)

-- Ragge