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A comment on Can a USR command damage a ZX Spectrum?.

Re:Can a USR command damage a ZX Spectrum? by stevenwoo on Monday December 16, 2019 @12:35AM (#21801017)
But you can kill a Commodore Pet with a poke, we had those Pets in our high school programming class in the 1980's.

https://en.wikipedia.org/wiki/Killer_poke

http://www.6502.org/users/andre/petindex/poke/index.html

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Re:Can a USR command damage a ZX Spectrum? by ksaj on Monday December 16, 2019 @04:30AM (#21801873)
The PET's killer poke made the text on the screen look like it was wrapped around a cylinder. The damage it could cause was screen burn in along the left-most and right-most columns because they were at maximum brightness, while the rest of the text was less bright and quite stretched out.
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