Cobol - Re: RCA301 was Re: IBM 1401 was: Re: Is it possible to use the value of the PROGRAM I

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Re: RCA301 was Re: IBM 1401 was: Re: Is it possible to use the value of the PROGRAM I

Robert Wagner

2004-06-20, 3:55 am

riplin@Azonic.co.nz (Richard) wrote:

>robert.deletethis@wagner.net (Robert Wagner) wrote

expected[color=darkred]
>
>When it had an 'IO error' the machine stopped and the operator fixed
>the card and refed it.

I was referring to tape read errors. Clark Morris said the operator would do a
backspace and re-execute the read instruction, ten bytes back. That agrees with
my memory. When that failed, the operator would 'correct' the error in memory.
Based on what?

>
>No, it didn't require the _programmer_ to downshift.

My programs were required to. They looked for an 'end is near' card.

The card reader ran like a check sorter, here comes the next card ready or not.
The program didn't say read a card, it said wait for wait for the next card. If
it diddled around too long, it missed a card.

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