--------------------<snip>---------------------

On the S/360, selecting which stacker in which to stack cards after they are read or punched is an option with the CCW command code, and is described in the "hardware manual" for that device or control unit rather than in the PoOps.
----------------------<unsnip>------------------
That's true, but when you're trying to do READ, PUNCH, SELECT STACKER all on the same record, timings are very important, bot hat the 2540 level and the CPU instruction level. You've only got so much time between the READ and PUNCH operations so instruction paths can be very important. The same is true of check processing operations, where yu need to read the check, evaluate it, perhaps print additional information, all before the check leaves the machine.

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