Compuprint 10200 Programmer Manual - Manual (Page 68)

Commands
64
Byte 4:
- Bit 7, 6 Graphic character description:
- 0: shading character
- 1: line drawing character
- 10: underscored character
- 11: not supported
All graphics characters are 30 dot high. An underscored character is defined as a
blank graphic (all zeros) and it is automatically generated by the printer. A
shading character repeats dots 1-6 of each column as dots 25 through 30
respectively. A line drawing character repeats dots 23 and 24 as the pairs 25
and 26, 27 and 28, 29 and 30.
- Bit 5 to 0 The number of dot columns of the character shape minus one. For example: the
character width of Draft generator is 10 dots and bit 5 to 0 must be set to 9.
- Bit 5 to 9 Compression mask description. It is used to optimize the memory occupation
and it is based on the concept that a dot column on its left is not stored. You can
calculate the compression mask of a character only after designing the entire
character. Every bit is associated with a dot column with the bit 7 of byte 5
associated with the leftmost column. The bit is set to {1}, if the column is equal
to the preceding one; otherwise, it is set to {0}. If the character is longer than 39
dot columns the remaining dot columns must be stored without compression.
The bit 40 (bit 0 of byte 9) must be 0. If no compression is present in the
character, byte 5 to 9 is composed by all zeros.