Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

vp(4) [v7 man page]

VP(4)							     Kernel Interfaces Manual							     VP(4)

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 control 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 otherwise 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 automatically. 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 function. There are 200 dots per inch both ver- tically and horizontally. When simultaneous print-plot mode is entered exactly one line of characters, terminated by NL, CR, or the remote 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 baselines that differ by fewer than 20 dot-lines. In print mode lines may be terminated either with an appropriate ASCII character or by using the remote terminate function. FILES
/dev/vp0 SEE ALSO
opr(1) VP(4)

Check Out this Related Man Page

PLOT(5) 							File Formats Manual							   PLOT(5)

plot - graphics interface DESCRIPTION
Files of this format are produced by routines described in plot(3), and are interpreted for various devices by commands described in plot(1). A graphics file is a stream of plotting instructions. Each instruction consists of an ASCII letter usually followed by bytes of binary information. The instructions are executed in order. A point is designated by four bytes representing the x and y values; each value is a signed integer. The last designated point in an l, m, n, or p instruction becomes the `current point' for the next instruction. Each of the following descriptions begins with the name of the corresponding routine in plot(3). m move: The next four bytes give a new current point. n cont: Draw a line from the current point to the point given by the next four bytes. See plot(1). p point: Plot the point given by the next four bytes. l line: Draw a line from the point given by the next four bytes to the point given by the following four bytes. t label: Place the following ASCII string so that its first character falls on the current point. The string is terminated by a newline. a arc: The first four bytes give the center, the next four give the starting point, and the last four give the end point of a circular arc. The least significant coordinate of the end point is used only to determine the quadrant. The arc is drawn counter-clockwise. c circle: The first four bytes give the center of the circle, the next two the radius. e erase: Start another frame of output. f linemod: Take the following string, up to a newline, as the style for drawing further lines. The styles are `dotted,' `solid,' `long- dashed,' `shortdashed,' and `dotdashed.' Effective only in plot 4014 and plot ver. s space: The next four bytes give the lower left corner of the plotting area; the following four give the upper right corner. The plot will be magnified or reduced to fit the device as closely as possible. Space settings that exactly fill the plotting area with unity scaling appear below for devices supported by the filters of plot(1). The upper limit is just outside the plotting area. In every case the plotting area is taken to be square; points outside may be displayable on devices whose face isn't square. 4014 space(0, 0, 3120, 3120); ver space(0, 0, 2048, 2048); 300, 300s space(0, 0, 4096, 4096); 450 space(0, 0, 4096, 4096); SEE ALSO
plot(1), plot(3), graph(1) PLOT(5)
Man Page

Featured Tech Videos