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This is why the DEL key is all ones. It was used to overpunch the wrong letter on a paper tape and replace it with a character that meant ignore (delete) it. A
by grymoire1 10y ago
This is why the DEL key is all ones. It was used to overpunch the wrong letter on a paper tape and replace it with a character that meant ignore (delete) it.
As done on an ASR-33
https://en.wikipedia.org/wiki/Teletype_Model_33 https://en.wikipedia.org/wiki/Teletype_Model_33
- muterad_murilax 10y agoI'm sorry, "all ones"?
- ufo 10y agoThe ASCII code for DEL is 127, which is 1111111 in binary.
- muterad_murilax 10y agoAh, of course. :) Thanks for the clarification!
- alblue 10y agoYup, I talked about this (and the origins of ASCII and why Ctrl+M is new line etc) in a talk I gave at the end of last year entitled "A brief history of Unicode". The video recording has just been published on InfoQ: https://www.infoq.com/presentations/unicode-history https://www.infoq.com/presentations/unicode-history
- mdrzn 10y agoReally interesting! Thanks for sharing.