On Mon, Jul 25, 2011 at 12:52 AM, yudi v <yudi....@gmail.com> wrote: > No it's not my homework, just curious. > > I looked at that link before posting. > > what confused me was the DEL key code. Usually the first 32 characters are > control characters but the wiki article clubs DEL with the control > characters where as it's assigned the last code in the table. That's after > the printable characters. > That's why I posted here to get a confirmation. >
It's history. The DEL code was all holes punched in paper tape (8-level) that was used to RUBOUT a character in error. Teletype and papertape systems were programmed to ignore the 0xFF code. When ASCII was formalized, the code for DEL was firmly in use as a control character and papertape was still in use. The various other "control" codes were used for various esoteric paper tape storage methodologies and later for 8-bit wide magnetic tape systems. Thanks for the nostalgia trip. -- G.Wolfe Woodbury redwolfe@gmail (dot) com
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