Printer “freezes” in Graphics
Mode.
Can’t get a full page in width.
Having trouble getting into
Graphics Mode.
User-Defined Characters
The last character is swallowed
by the printer . . . nothing gets
printed.
Characters are one dot too high
or low.
Characters are running too close
together.
Some of the dots are being
ignored by the printer.
The printer expects a certain
number of pin patterns, deter-
mined by n
1
and n
2
. It will wait
patiently until the quota is full.
Note that 9-Pin Graphics Mode
requires two bytes for each col-
umn of graphics.
Some systems require a WIDTH
statement. See your system docu-
mentation.
Seven-bit computers are limited
to widths of 0 - 127, 256 - 383, 512
- 639,
etc. See below.
Make sure the high-order bit is
OFF. For 7-bit computers, that
means sending the code: ESCape
" = "
Make sure the attribute byte is
sent before the 11-pin patterns for
EACH character.
Use the correct setting for the
attribute byte. An attribute byte
less than 128 makes the bottom 8
pins active (good for descenders).
An attribute byte of 128 or
greater activates the top 8
(matching ROM characters with-
out descenders).
You must reserve space between
characters within the character
design. Typically, the last 2 col-
umns are defined as 0. See the
matrixes for ROM characters in
Appendix A.
Two dots in the same row cannot
be printed in adjacent columns.
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