HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part I

15-28 Raster Graphics EN
z
For method 3 - Since delta row compression requires that the
seed row be available whenever raster graphics mode is entered,
the seed row is initialized to zeros upon raster graphics mode
entry (
E
C
*r#A). The seed row is also initialized upon receipt and
completion of each raster block.
z For method 3 - If the row length terminates the data before the
control byte value is satisfied (literal byte count greater than row
length), the data following the control byte (if any) is printed as
text. The cursor is incremented.
z For method 3 - if the row length is equal to one, the current row is
duplicated, and the cursor is incremented.