25 May
2012
25 May
'12
1:54 a.m.
On Thu, 24 May 2012, Tony Duell wrote:
Mechncial ; I've not seen one that actually makes
contact through the
holes, but mechancial pins (often called 'peckers' over here) that went
Sure they exist. Our Diehl Dilector (external paper tape reader for the
Diehl Combitron) contains a Siemens reader unit that works exactly like
that. Sprocket feed and brushes, just like old punched card equipment.
Capacitive : I've never seen one, but apparently
Facit tried a thing that
detected the cahnge in capacitance when the tape (rather than a hole) was
over the read electrode. I am told it was not that reliable...
I have two Facit units, they can be switched between 500 and 1000 cps.
They support start-stop mode (quite slow) and a continuous-run mode. The
motor needs some time (some deciseconds I guess) to come to full speed, so
the data rate increases up to the selected maximum.
And I've heard of readers with 2000 cps...
Christian