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On 29 July 2016 at 19:18, CRPence wrote:
[…] I still am not entirely clear what is the general purpose of
the Record ID indicator on the type=record-format line of the
I-spec […] I understand the effect as utilized, or I believe I do;
i.e. the indicator is on, when and only when, the record from the
I-spec is read […]
[…] Back then we're talking code for 80 or 96 column cards. […]
Put your mind in the era of punched cards. […]
I* column 1 = '1' means 'sold to'
ICARDINP NS 01 1 C1
[…]
When we read a card with a 1 in column 1, indicator 01 gets turned
on and the program knows it just read a 'sold to' card. […]
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