On Wed, 29 Aug 2018, Clem Cole wrote:

>       But yeah, when a DZ11 was blazing away at 19200 baud (I hacked
>       the TOPS-10 6.03A we had at LIRICS to support it), it made the
>       system crawl.
> 
> No doubt.   CMU and MIT had front ends that put the serial lines on 
> dedicated PDP-11s in front of the 10's - so the Tops (or ITS) only saw 
> canonicalized I/O and it made a huge difference for those systems.  By 
> the time Vaxen, I don't think DEC had yet realized what a problem the DZ 
> was. 

Did the Aussie DZ-11 drivers (there were two versions) not make it out of 
the country?  They are on the UNSW tapes, and I seem to recall a thread 
about this...  I don't know how fast we drove them, but I doubt whether it 
was 19200; probably 9600 for the lucky few and 2400 for the plebs.

-- Dave