hp(1)							      General Commands Manual							     hp(1)

NAME

       hp - handle special functions of HP2640 and HP2621-series terminals

SYNOPSIS

DESCRIPTION

       supports  special  functions of the Hewlett-Packard HP 2640 and HP 2621 series of terminals, with the primary purpose of producing accurate
       representations of most output.	A typical use is:

       Regardless of the hardware options on a given terminal, tries to do sensible things with underlining and reverse line-feeds.  If the termi-
       nal has the ``display enhancements'' feature, subscripts and superscripts can be indicated in distinct ways.  If it has the ``mathematical-
       symbol'' feature, Greek and other special characters can be displayed.

   Options
       recognizes the following options:

	      Specify that your terminal has the ``display enhancements'' feature,
			to make maximal use 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, assumes that your
			terminal lacks the ``display enhancements'' feature.  In this case, all  overstruck  characters,  subscripts,  and  super-
			scripts are displayed in Inverse Video mode; that is, dark-on-light, rather than light-on-dark.

	      Request minimization of output by removing new-lines.
			Any  contiguous  sequence  of 3 or more new-lines is converted into a sequence of only 2 new-lines; that is, any number of
			successive blank lines produces only a single blank output line.  This allows you  to  retain  more  actual  text  on  the
			screen.

DIAGNOSTICS

       The representation of a line exceeds 1,024 characters.

RETURN VALUE

       returns zero for normal termination, and 2 for all errors.

WARNINGS

       An  ``overstriking  sequence''  is defined as a printing character followed by a backspace followed by another printing character.  In such
       sequences, if either printing character is an underscore, the other printing character is shown underlined or in Inverse Video;	otherwise,
       only  the first printing character is shown (again, underlined or in Inverse Video).  Nothing special is done if a backspace is adjacent to
       an ASCII control character.  Sequences of control characters (e.g., reverse line-feeds, backspaces) can make text ``disappear''; in partic-
       ular, tables generated by that contain vertical lines will often be missing the lines of text that contain the ``foot'' of a vertical line,
       unless the input to is piped through (see col(1)).

       Although some terminals do support numerical superscript characters, no attempt is made to display them.

SEE ALSO

       col(1), neqn(1), nroff(1), tbl(1).

																	     hp(1)