shebang strange thing...
kp at kyborg.dk
Sat Jun 28 00:28:13 CEST 2003
Ben Finney wrote:
> On Fri, 27 Jun 2003 10:46:49 +0100, Tim Rowe wrote:
>>On 27 Jun 2003 09:33:23 +0950, Ben Finney wrote:
>>>So, it was teletypes that needlessly preserved the CR and LF as
>>>separate control operations
>>It wasn't needless. A CR with no LF was often used for overstriking,
>>as a way of extending the rather limited character set. 'O'
>>overstruck with '-' would make a passable \Theta, for instance..
> Overstriking is amply catered for with the BS (BackSpace) control code.
> For the "theta" example: emit a 'O', emit a BS, emit a '-'. In fact,
> this method continues today in some *roff outputs, for bold or digraph
> characters. The CR is completely redundant for this purpose.
Although the first is correct (using BS to get the effect) it implies
that the printer/typewriter that you want to make this effect on, is
able to backspace _precicely_ whereas the CR method can be made simple
and easy with a mechanical(?) stopper, that ensures that you always
start at the same point.
> I maintain that the CR and LF were needlessly preserved as separate
> operations, with no benefit.
Med Venlig Hilsen / Regards
Kim Petersen - Kyborg A/S (Udvikling)
IT - Innovationshuset
Tlf. +4576408183 || Fax. +4576408188
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