19 Jun
2013
19 Jun
'13
3:30 p.m.
On 19/06/2013 21:12, Tony Duell wrote:
Not sure about Murray/Baudot, to be honest. But several character codes
were non-spacing and think the shifts were. Anyway, I modified the
print drum a little to make it easier to get certain things by using
overstrikes. And then wrote a driver that translated the Sorcerer's
8-bit codes into 5-bit plus shifts and overstrikes where appropriate.
--
Pete Peter Turnbull
Network Manager
University of York
Presumably your Creed 7 was 50 baud, or 45.45 if you
twiddled the
govvernor screw.
50 baud, yes. So one part of the interfacing was making a little
daughterboard to divide by 6 and feed that to the UART when serial (but
not cassette) was selected.
IIRC the Creed receiving magnet takes about 20mA to
flip it over, but
it=;s quite inductive (4H or so?) If you use what looks like a suitable
voltage, you will find it doen't work, the time constant is simply too
long. Sicne the time constant of a n LR circuit is L/R, you do better by
using a higher voltage (80V is transtional) and a resisotr (around 4k).
Been there, done that....
That part had been taken care of by the previous owner. It had an 80VDC
supply. I just had to do a little extra.
the Creed
spoke Murray. I still got it printing listings fairly quickly.
Is it strictly Marray code? It's ITA2, certainly, but I thought Murray
code comvined the shifts with spaces, so you had 'letters space' and
'figures space' (and you therefore coudn't print 'RS232C', it would
appera as 'RS 232 C').