26 Aug
2015
26 Aug
'15
7:35 p.m.
On 26 August 2015 at 14:03, tony duell <ard at p850ug1.demon.co.uk> wrote:
I've only ever seen the ones with 3 position
levers, but from reading the
manuals I think the 3 position levers are manual control models and
4 position levers are automatic control models (with extra levers and
swtiches in the stunt box to start and stop the reader using XON/XOFF
characters)
You are correct. The four position reader control lever are for
machines that use DC1/DC3 (XON/XOFF) to control the reader
automatically.
The 3 position lever models (manual control) can
certainly take the reader
run relay and be used with PDP8s and PDP11s.
If I recall correctly; weren't the "preferred" versions of the 33ASR
for use where the reader was controlled by the computer the 3-position
manual reader control models? Since the reader won't run unless the
computer is asserting the reader control lines anyway, and with such
hardware flow control XON/XOFF automatic control become redundant.
Regards,
Christian
--
Christian M. Gauger-Cosgrove
STCKON08DS0
Contact information available upon request.