30 Aug
2018
30 Aug
'18
6:13 a.m.
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