[GreenKeys] What's this?

[Robert Downs]

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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