VP(4) VP(4)
NAME
vp - Versatec printer-plotter
DESCRIPTION
Vp0 is the interface to a Versatec D1200A printer-plotter
with a Versatec C-PDP11(DMA) controller. Ordinarily bytes
written on it are interpreted as ASCII characters and
printed. As a printer, it writes 64 lines of 132 characters
each on 11 by 8.5 inch paper. Only some of the ASCII con-
trol characters are interpreted.
NL performs the usual new-line function, i.e. spaces up
the paper and resets to the left margin. It is ignored
however following a CR which ends a non-empty line.
CR is ignored if the current line is empty but is other-
wise like NL.
FF resets to the left margin and then to the top of the
next page.
EOT resets to the left margin, advances 8 inches, and then
performs a FF.
The ioctl(2) system call may be used to change the mode of
the device. Only the first word of the 3-word argument
structure is used. The bits mean:
0400 Enter simultaneous print/plot mode.
0200 Enter plot mode.
0100 Enter print mode (default on open).
040 Send remote terminate.
020 Send remote form-feed.
010 Send remote EOT.
04 Send remote clear.
02 Send remote reset.
On open a reset, clear, and form-feed are performed automat-
ically. Notice that the mode bits are not encoded, so that
it is required that exactly one be set.
In plot mode each byte is interpreted as 8 bits of which the
high-order is plotted to the left; a `1' leaves a visible
dot. A full line of dots is produced by 264 bytes; lines
are terminated only by count or by a remote terminate func-
tion. There are 200 dots per inch both vertically and hori-
zontally.
When simultaneous print-plot mode is entered exactly one
line of characters, terminated by NL, CR, or the remote
VP(4) VP(4)
terminate function, should be written. Then the device
enters plot mode and at least 20 lines of plotting bytes
should be sent. As the line of characters (which is 20 dots
high) is printed, the plotting bytes overlay the characters.
Notice that it is impossible to print characters on base-
lines that differ by fewer than 20 dot-lines.
In print mode lines may be terminated either with an appro-
priate ASCII character or by using the remote terminate
function.
FILES
/dev/vp0
SEE ALSO
opr(1)