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The last time I used them was Sys3 card system in the 80's. It was used to indicate exceptions based on having the punch cards in the wrong order. It was the only option available since there were no terminals. Recovery was a setting on the front panel knob switch. I would guess the switch was a rudimentary version of the normal halt responses for Sys36. (0,1,2,3). Good Times.
John Yeung <gallium.arsenide@xxxxxxxxx> 12/4/2020 12:13 PM >>>
I've never seen them in the wild, and have never heard anyone talk
about them, even old-timers who reminisce about match field indicators
and share war stories about RPG II.
To me, halt indicators seem like a light-weight, bare-bones exception mechanism.
Were they unpopular because they were TOO bare-bones? What's the story
on halt indicators?
John Y.
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