.BG
.VE $Header: /usr3/s/current/s/.help/RCS/hp72,v 1.2 83/12/30 19:29:12 rab Exp $
.FN hp72
.FN hp72h
.FN hp72v
.FN hp7221
.FN hp7221h
.FN hp7221v
.TL
hp7221 hp7221h hp7221v: Hewlett-Packard 7221a Pen Plotter
.CS
hp7221(width, height, ask, auto, with2621, speed)
hp7221h
hp7221v
.PP
.AG width
width of plotted surface in inches.
Default 8 for `hp7221v', 10 for `hp7221h', 15 otherwise.
.AG height
height of plotted surface in inches.
Default 8 for `hp7221h', 10 otherwise.
.AG ask
logical, should user be prompted by "GO?" prior to advancing to new
frame? Default TRUE.
.AG auto
logical, can device automatically advance the paper (H-P 7221S)?
Default FALSE.
.AG with2621
logical, is the plotter configured with H-P 2621 terminal?
Default FALSE.
If TRUE, special output is provided to make the plotter
and terminal work together.
.AG speed
maximum allowed axis pen velocity ranging from 10 to 360 mm/sec.
Default 360.  Slower speeds are useful for high-quality work or
for plotting on special paper or film.
.PP
These commands identify Hewlett-Packard 7221 series plotters.  The
plotter may be used with standard 8.5 by 11 inch paper with the long
dimension horizontally (`hp7221h') or vertically (`hp7221v'), or with 11
by 17 paper (`hp7221').
The arguments listed after `hp7221' can also be given with `hp7221h' or `hp7221v'.
.PP
Whenever a new plot is about to be produced, the message "GO?" appears
on the terminal.  At this time, new paper may be loaded, pens changed,
etc.  When ready for plotting to proceed, simply hit carriage return.
.PP
When graphic input (`identify', `rdpen') is requested, the `enter'
button will light.  The pen should be positioned by means of the 5
directional buttons.  When the desired pen position is reached,
depress the `enter' button.  To terminate the input,
hit carriage return on the terminal (the coordinates of the
pen are not transmitted).
.PP
Character sizes may be changed to any desired value.  Color can be
changed to any of the values 1 to 8, indicating the pens in stables 1
to 8.  Characters can be rotated to any orientation.  Different line
styles (1, 2, ...) are available, with patterns becoming more
spread-out as the line style is larger.
.PP
ALWAYS BE SURE that the pen is back in the holder when you are done
with the terminal. Either the S function `q' or hitting in succession
the `enter' button followed by the button below the currently empty
holder will do this. Users who fail in this respect will be devoured
by the dry-pen dragon.
.PP
.SH NOTE
The switches on the back of the device should be set to reflect
the correct speed and parity settings for the computer system.
Incorrect parity settings may cause failures of digitizing functions, e.g.,
`rdpen' and `identify'.
.PP
A device must be specified before any graphics functions can be used.
.KW device*
.WR
