[TUHS] Teletype simulator?

[cowan@mercury.ccil.org (John Cowan)]

George Ross scripsit:

> And don't forget that carriage-return takes longer than printing individual
> characters, so you need to send CR LF to give it time to get back to the
> first column while it's feeding a line.  Or CR CR LF just in case.

It's true that CR takes longer, but you have to send both CR and LF because
CR only returns the carriage whereas LF only feeds lines.  Skipping to the
bottom of a page was done by sending pure LFs, whereas underlining was
achieved (though the 33 had backarrow rather than underscore) by sending
a line of text followed by CR followed by a line of spaces and underscores.
Later, when it was observed that this made the text illegible on glass TTYs,
the order was reversed: spaces and underscores, then CR, then text.

> (Or was that the Olivetti terminal?  Or the DECwriter?  One of those
> mechanical things anyway.)

It may have been the Olivetti.

-- 
John Cowan          http://www.ccil.org/~cowan        cowan at ccil.org
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