Date   : Fri, 04 Oct 1985 16:04:43 GMT
From   : bower@dca-eur.ARPA
Subject: Re: 150 baud terminals

Must strongly disagree with the statement that Model 37's wear
out fast.  I have one (currently in storage) that was the ONLY printer
on my home system(s) for over 3 years, often printing large assembly
listings lasting over 6 hours.  As long as you gave them an annual oil
change and lube, they will last almost indefinately.  The one I have
is set for 10 pitch, although I understand some were 12-pitch, and
printed only 69 characters before inducing an automatic line feed.
   The 150 bps speed appears to be an early effort into the standard
rates governed by the "75 times 2 to the nth" rule comprised of 75, 150,
300, 600, 1200...etc bit rates.
   One quirk on some Model 37s is that many had the MIL-STD-188C inter-
faces which use a POSITIVE voltage for a logical "1" whereas RS-232 uses
a NEGATIVE voltage for a logical "1".  This means that an extra inverter
is required when driving the device from commonly available interfaces.
                Hal