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1200 BAUD A BOTLENECK IN LASERWRITER NTII

The department has one Apple LaserWriter NTII connected to a Unisys PW300
through the serial interface.  The transfer of the data is quite unreliable,
and using the speed 9600 baud will cause io errors about every second page.
If the speed is redused to 1200 bauds the operation is faultless.

The programs we use write to the LPT1 port and it is redirected the normal
way  using: MODE LPT1:=COM2:.

The LaserWriter NTII owners manual says the serial port should be 
configured: MODE COM2:9600,N,7,1,P but it does not work, it must be
configured: MODE COM2:9600,N,8,1,P to work at all. This is the way
my AST TurboLaser/PS manual tells me to configure the port.

The same programs write perfectly with both serial and parallel ports
with my AST TurboLaser/PS, here I use mostly the parallel interface,
but I have tested the programs and procedures I have tried on the
LaserWriter NTII with the serial interface and they work ok.

Has anybody some knowledge or experience with this Apple printer.
I have tested several computer with the printer, so I do not believe
there is anything wrong with the serial port ow the computer. 
Is this a bug in the computer of the department or is it a feature
of the Apple LaserWriter NTII?

Lauri Tarkkonen
Univeristy of Helsinki
Finland