[J3] Questions about dusty CDC 3400 deck

[Van Snyder]

I'm trying to resurrect a CDC 3400 program.

It has weird stuff that is easy to repair, such as numeric common block
identifiers, the same labels for FORMAT and executable statements,
references to vendor-specific intrinsics such as TIMELEFT and SKIPFILE.
and weird but obvious IF statements such as IF(EOF,60) 1,2. There is a
manual online, but there's stuff it doesn't expalin.

The program changes a DO index. Does anybody remember whether that
changes the looping, or is that established when the DO statement is
executed?

It references a 2D array using one subscript (albeit only in a PRINT
statement). Does anybody remember which element that would access?
Would it be the one in array-element order?

Thanks,
Van

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