Way back when (79,80) I ran machine with a GE Mark Century 100 control. The
control was built in 1958. No tool length offets, the zero position was
adjusted with thumb wheel dials and no memory only a tape reader. Block
delete was useful then because there was no program changes at the machine.
If the programmer would put a manreadable section at the beginning of each
tool the you could position the tape in the reader to start in the middle
of the program.
The control box was about 6 feet square and about 5 feet tall.


On Fri, Mar 27, 2020, 1:21 PM Reinhard <reinha...@schwarzrot-design.de>
wrote:

> Hi,
>
> > Block delete is not used for comment lines.
>
> I know. I was suggesting, that in case block delete is not supported,
> using
> brackets (character for multiline comment) could offer same functionality
> and
> you need less characters to disable multiple lines.
>
> > I haven't used block delete for over 20 years.
>
> I never have used block delete so far.
> In case I want to use only part of existing program, I use "run from line"
> together with M0
>
>
> cheers Reinhard
>
>
>
>
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