Greg asks:

> Wirt wrote:
>  > HP invented that particular sequence as part of its PCL (printer
>  > control language) -- although the PCL escape sequence structure
>  > itself was nothing more than an extension of the escape sequences
>  > that HP used for their first 2640 terminals, which were first
>  > released in the early 1970's.
>
>  So, [Esc](sB was the sequence to turn on 'bold' or bright on those
>  terminals? Of course, that's different from our beloved 700/92s.

No. Almost all of the PCL escape sequences are merely a philosophical
*extension* of the terminal escape sequences that HP first introduced in 1974
with its first 8008-based 2640 terminal. There never has been a bold escape
sequence for HP terminals. Instead, HP has employed a half-bright sequence
(Esc&dH) in its place.

It's important to note however that HP didn't invent the basic idea of escape
sequences. They date from the very earliest VDT's (visual display terminals)
of the mid- and late-1960's, and as you might imagine, HP tried to make its
first early 1970's terminals as consistent with the existing de facto
standards as it could -- as did everyone else -- thus sequences such as EscA,
EscB, EscC and EscD work the same way in virtually every brand of terminal
ever made.

Wirt Atmar

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