On Tue, 12 Jul 2016 00:29:08 +0000, Jesse 1 Robinson wrote:

>Unsuccessful open is not necessarily the end of the world...
 
>In my experience, S0C1 is the most likely consequence, I presume because 
>some location that should contain a valid instruction after open does not.

Yes. The address of the GET or PUT routine has not been filled in. as a result, 
that location contains zero. Branch to location zero causes a S0C1.

-- 
Tom Marchant

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