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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