PWB1/usr/man/man1/hp.1

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.th HP I 5/31/77
.sh NAME
hp \*- handle special functions of HP 2640 terminal
.sh SYNOPSIS
.bd hp
[\fB\*-e\fR]
[\fB\*-m\fR]
.sh DESCRIPTION
.it Hp
supports special functions of the Hewlett-Packard 2640
family of terminals,
with the primary purpose of producing accurate representations of most
.it nroff\^\c
(I)
output.
Typical uses are:
.s3
	nroff \*-h files ... \*v hp		or:
.if n .br
	nroff \*-h \*-s files ... \*v hp
.s3
In the latter case,
.it nroff
will stop at the beginning of each page including the first and wait for
you to hit LINE FEED to initiate
output.
.s0
Regardless of the hardware options
on your terminal,
.it hp
does sensible things with underlining and reverse line feeds.
If the terminal has the
display enhancements feature,
subscripts and superscripts can be indicated in distinct ways.
If it has the mathematical-symbol option, you can see Greek and other special
characters.
.s3
The flags are as follows:
.s3
.lp +5 4
\fB\*-e\fR	it is assumed that your terminal has the display
enhancements feature, and so maximal use is made of the added display modes.
Overstruck characters are presented in the Underline mode.
Superscripts are shown in Half-Bright mode,
and subscripts in Half-Bright, Underlined mode.
If this flag is omitted,
.it hp
assumes that your terminal lacks the display enhancements feature.
In this case, all overstruck characters, subscripts, and superscripts
are displayed in Inverse Video
mode, i.e., dark on light, rather than the usual
light on dark.
.s3
.lp +5 4
\fB\*-m\fR	requests minimization of output by removal of newlines.
Any contiguous sequence of 3 or more newlines is converted into
a sequence of only 2 newlines;
i.e., any number of successive blank lines produces only
a single blank output line.
This allows you to retain more actual text on the screen.
.i0
.s3
With regard to Greek and other scientific characters,
.it hp
provides the same set as does
.it gsi\^\c
(I),
except that "not" is approximated by a right arrow,
and only the top half of
the integral sign is shown.
The display is adequate for examining output
from
.it neqn\^\c
(I).
.sh DIAGNOSTICS
"line too long"	 if representation of a line exceeds 300 characters, which
would occur, for instance,
if you underlined every other character in an 80-character line
containing many Greek characters.
.sh "EXIT CODES"
0 \*- normal
.br
1 \*- for any error
.sh "SEE ALSO"
gsi(I), HP2640(VII), neqn(I), nroff(I)
.sh BUGS
Note that the second or later characters in an overstriking sequence are
always assumed to be underlines.
For example, a bullet made from lower-case "o" overstruck with "+" appears
as an "o" that is either underlined or shown in
Inverse Video.
Although some terminals do provide numerical superscript characters,
no effort is made to display them.
The programming is ugly, and most terminals
do not possess this feature.