Compuprint MDP40B Programmer Manual - Manual (Page 83)

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Box drawing characters whose attributes indicate expansion are not expanded when
printing double high print mode.
Slice1 … Slice 12 Each byte defines the image information for the vertical columns
(slices) of the graphic. Slice 1 defines the leftmost vertical column,
and Slice 12 defines the rightmost vertical column. Within each slice,
as defined by three consecutive bytes, the bytes represent the top,
middle and bottom-eight dots of the slice, respectively. Within each
byte the most significant bit (bit 7) defines the topmost dot and the
least significant bit (bit 0) defines the bottommost dot of the slice.
When a bit is on, the corresponding dot is to be printed.
Horizontally consecutive dots are eliminated in standard text print mode (but are
printed in letter-quality print mode). The dot elimination process starts from the left.
The printer interprets code points 00H, 20H, 7FH and FFH as cases. Care should be
taken when you downloaded characters for these code points.