QMS SmartWriter 80+ User Manual page 303

the RAM area. This will avoid having
to
switch back and
forth between the two areas.
K.4 Graphics Using 7-Bit Systems
If
you have a 7 -bit system, there are some problems in
Graphics Mode which you must get around. The En-
ter Graphics Mode <ESC> commands use the nl and n2
parameters. Seven-bit users, however, cannot use these
parameters alone to access the full 8-inch page width. In
7-bit systems, the n1 range is 0-127 instead of 0-255. (The
n2 parameter range is not affected
in
7-bit systems.)
The following table lists the available ranges of n 1 and n 2
for different widths.
(01
= 0-127) +
(02
= 0) =
widths of 0-127 dots
(01
= 0-127) +
(02
= 1) =
widths of 256-383 dots
(01
= 0-127) +
(02
= 2) =
widths of 512-639 dots
(01
= 0-127) +
(02
= 3) =
widths of 768-895 dots
(01
= 0-127) +
(02
= 4) =
widths of 1024·1151 dots
(01
= 0-127) +
(02
= 5) = widths of 1280-1407 dots
(01
= 0-127)
+
(02
= 6) =
widths of 1536-1663 dots
(01
= 0·127) +
(02
= 7) =
widths of 1792-1919 dots
For example, Single Density has 480 dot columns in the
full 8 inches. However, 383 is the maximum available to
7-bit system users (512, the next lowest number, is too
much). The only way around this is to send two Single
Density Graphics Mode commands in the same line-one
for 383 columns and one for 97 columns.
K.S
Control Codes Redefined
In the command for user-defined characters, the ASCII
characters 0-31, 127-159, and 255 cannot be used to
re-
define characters. These slots are generally reserved for
control codes (used to give directions to the printer). If you
need the additional space for user-defined characters, the
Appendix E E-41