[GreenKeys] What's this?

[Jim Cooper]

Robert,  the procedure you describe is exactly 
what was done to 'erase' errors in punching the 
tape EXCEPT that you didn't punch 'blanks' because 
a blank is NO holes punched ...  to erase errors, the 
tape was backed up and repunched with LETTERS 
which punches ALL five holes and results in no 
character being printed when the tape is run. 

w2jc

On 3 Aug 2019 at 12:15, Robert Downs via GreenKeys wrote:

> If I recall correctly (and I
> probably haven't thought about it
> since the early 70's), BLANK DELETE
> was a either a means of backing the
> tape up and over-punching an error or
> errors with a BLANK or BLANK's which
> are then ignored by printers.  Or it
> was the act of doing so manually. 
> And manually was the only reliable
> option if you were punching chadless
> tape.  To use the "feature", you had
> to back up to the error and punch
> BLANKS all of the way up to the end of
> wherever you had gotten when the
> error was discovered.  If that was
> more than a few inches of tape and
> you were using a chadless punch, it
> was common practice to cut and
> splice. 
> 
> Robert Downs
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John,
> W9DDD
> Sent: Saturday, August 3, 2019 08:06
> To: Green Keys
> Subject: Re: [GreenKeys] What's this?
> 
> So what energizes the solenoid, and how does the mod keep blanks
> from 
> being punched?  At some time in the history there was a
> specification 
> written that would reveal all.
> 
> John, W9DDD
> 
> 
> > On Aug 2, 2019, at 11:04 PM, Jim Cooper <jim.w2jc at gmail.com>
> wrote:
> > 
> >> On 2 Aug 2019 at 22:50, John, W9DDD wrote:
> >> 
> >> Which makes no sense to me, why do
> >> you need to delete a blank, it's a
> >> NOP.
> > 
> > because if the loop goes open you will punch 
> > miles of tape with only the tiny center holes ... 
> > 
> > 
> > 
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