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

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

>robert.deletethis@wagner.net (Robert Wagner) wrote
 
expected 
>
>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 w
ith
my memory. When that failed, the operator would 'correct' the error in memor
y.
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 n
ot.
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.