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122
third, and fourth dots, add their values (128 + 32 + 16) to send
this total: CHR$(176). This is one byte of graphics data; it would
replace
ml
in our format statement.
32
32
[24-dot graphics]
(Standard mode)
IBM mode)
[g-dot graphics]
Ggure 7-6.
Starting
with the most significant bit at the top, each
third pin of the print head is assigned a value which is a power of two
in case of B-dot graphics modes.
COMPATIBILITY
WITH EXISTING SOFTWARE
With its ability to print eleven different
graphics
densities,
this printer's graphics abilities are advanced indeed. There are
many programs,
in fact, that are unable to use this printer's
single graphics command
(ESC) "*" for selecting
the proper
density. To maintain compatibility
with this software, there are
individual commands
to select each of this printer's
common
graphics densities. These commands,
which are shown in Table
7-4, can be used interchangeably
with the corresponding
(ESC)
"*" command.
Like the commands
you are already familiar
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