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TI Model 880 Printer Emulation 4-27
Raster Graphics Commands
In the Model 880 raster graphics mode, the printer alternates between
the left and right printhead pins and uses only the top eight pins of
each column. The graphics feature enables you to create drawings by
sending dot patterns (in the form of hexadecimal codes) to the printer.
When the printer receives a hexadecimal code from the host computer,
it maps the individual code bits to the individual printhead pins.
Set Up Graphics Parameters
Escape sequence: ESC [ H ; B ; V q
Hexadecimal: 1B 5B H 3B B 5B V 71
This command sets the horizontal dot density (H) and the vertical
line spacing (V) and specifies the number of hexadecimal code bytes
(B) to print. The variables H, V, and B are as follows.
q Horizontal dot density (H) — 60, 72, 120, or 144 dpi. The default
value is 60 dpi. If the horizontal dot density is omitted, the
printer defaults to the last value selected since the last power-up
operation.
q Number of hexadecimal code bytes (B) to print — can be set to
any value in the range of 0 to 1958 (for a line width of 13.6
inches and a horizontal dot density of 144 dpi). If this parameter
is omitted or set to 0, the printer prints no raster graphics.
q Vertical line spacing (V) — N/144 inch, where the range of N is
0 through 255. A value of 0 indicates that no line feed operation
is to occur.