> On May 26, 2016, at 6:05 PM, Clem Cole <[email protected]> wrote:
>
>
> On Thu, May 26, 2016 at 4:56 PM, Mark Pizzolato <[email protected]
> <mailto:[email protected]>> wrote:
> I agree. If this whole discussion is about if a simulated card reader device
> interface should try to magically correct for garbage input (i.e. lines longer
> than card images), then I suggest that the best simulation is to behave as
> closely to how real systems worked.
>
> The question of what real systems did is open. IIRC TSS as a system read in
> all 80 columns, but as was pointed out the FTN compiler ignored them. But
> not all of them did. I still have the algol-w compiler source around
> somewhere in PL/360 -- which might give you a hint
I have never heard of any device that wouldn't give you 80 columns. Even
limited systems like the 1620 which believed that the only I/O encoding was the
one it implemented didn't do any such thing.
I just remembered one example of an 80 column card with something beyond column
80, but that isn't really relevant to computer I/O and I don't think computers
paid attention. That is the verifying mode of some keypunches (model 129?)
where successful verification of the card would cause it to be marked with a
punch in "column 81".
paul
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