[GreenKeys] reperf power backspace - how was it used?

[Jack]

There was a mod kit that would put “local backspace” into a 28

typing unit and keyboard that could be operated in conjunction with a switch

to control a remote reperf backspace solenoid. But I think that would an impractical

configuration. I can’t conceive of a reason to specifically have the

backspace feature on an ROTR. The LPR for an ASR would also have

a different drive shaft configuration than a standalone ROTR, from

what I can recall. I have a chad-type LPR on my 28ASR keyboard that

has the backspace solenoid.

 

I had a 28KSR set up with both the local backspace and local

reverse line feed mod kits. Fun, but of no use! This machine actually

had every RED key hole filled with HERE-IS, etc., keys.

 

The Model 37 had on-line reverse line feed and backspace…but that’s

an entirely different story!

 

Jack K2TTY

 

 

From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Thursday, March 16, 2017 1:30 PM
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] reperf power backspace - how was it used?

 

I have been getting a few M28 standalone reperfs running lately. Several have power backspace which I can understand would be hooked up to a keyboard key in an ASR or KTR. 

But the ones I have are installed in standalone (ROTR) units with no keyboard. Was there cabling to remote backspace from a KSR keyboard somewhere else? Or do I just have random reperfs intended for ASR or KTR use that have been stuck into these ROTRs sometime in the last 50 years? 

A similar question goes for non-automatic tape feed-out, but that could just be a button switch on the ROTR

 

If you haven't seen this feature, power backspace is a solenoid operated gizmo which would back up the punched tape one character so you could type a LTRS character to then correct a mistake. The power comes from a crank arm on the end of the selector shaft -
http://www.navy-radio.com/tty/reperf/tt192-110619-04.jpg

A cool feature is on chadless tape reperfs where a rotating bar has fingers to push the chad "lids" back into the tape so it doesn't get caught when trying to back up. You can see the fingers poised above the tape here -
http://www.navy-radio.com/tty/reperf/tt192-ug-1205-03.jpg

Yours in teletypery,


Nick England K4NYW

www.navy-radio.com <http://www.navy-radio.com> 

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