Tally T5023+ Programming Manual page 174

Syntax of the graphics commands
The parameters n and m determine the number of dot columns to be printed:
Number of dot columns = m * 256 + n
In 8-dot graphics mode, one data byte per dot column must be specified, in 24-
dot graphics mode three data bytes per dot column
The section "Mode of operation of the graphics commands" contains
i
further notes on the command ESC * (s) (n) (m).
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T5023/5023+ - Programming Guide
Graphics commands
.