[GreenKeys] 33-ASR Paper Tape Punch Faults

[PJ Bennett]

Just wanted to confirm the need for time for a carriage return.  I made a embedded processor board that received text messages and printed them on my KSR-33.  What I didn't appreciate was the time it took for a physical machine to do a carriage return. The first line of text was always perfect, but the subsequent lines sometimes had wrong or missing characters.  This was a result of just sending the data, albeit slow at 300 baud, in a constant stream and not waiting after a CR to let the carriage actually return before sending the next characters.

Adding a short delay after a CR fixed these issues.

Hope this helps,

PJ

PJ Bennett
mobile: +1 918 704 7055
Sent from my iPhone

> On Oct 5, 2015, at 3:29 PM, teletypeparts at comcast.net wrote:
> 
> Absolutely correct, Doug. 
>  
> Check this advice first.  The carriage should return and stop, no bounce, no bang, no slowing down.  
>  
> Also, make sure you are typing, punching a tape or programming the computer to generate a CR, then LF to give the carriage time to return.  A DELETE is nice after the LF if possible.  CR, LF, Rubout or Delete. 
>  
> Wayne
> 
> From: "Douglas W Jones" <douglas-w-jones at uiowa.edu>
> To: "GREENKEYS BULLETIN BOARD" <GreenKeys at mailman.qth.net>
> Sent: Monday, October 5, 2015 3:07:45 PM
> Subject: Re: [GreenKeys] 33-ASR Paper Tape Punch Faults
> 
> On Oct 5, 2015, at 1:26 PM, teletypeparts at comcast.net
>  wrote:
> 
> > Try this.  With the carriage returned in the dashpot, loosen the two screws holding the dash pot and move it just a little to the left.  Tighten screws and try it.  Make sure the dashpot it square to the plunger.  Also the plunger and dashpot should be cleaned with solvent on a rag and lightly coated with oil.  After cleaning and lite coat of oil, hold onto the carriage as you type the first CR as the plunger will likely not be aligned to the dashpot.
> 
> Also, there's a lever on the vent on the back of the dashpot that
> controls how airtight it is.  Opening the vent too far allows the
> carriage to slam to the left with a bang.  If the vent is closed
> too far, the carriage will take too long to reach the left margin
> and the first character you print may be smeared and not solidly
> on the margin because it was printed while the carriage was in
> motion.
> 
>                 Doug Jones
>                 jones at cs.uiowa.edu
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