Specifications

The following is an example using the ^CO instruction.
To resize the print cache to 62K:
^COY 40K (default memory) + 22K (existing cache) = 62K
To resize the print cache to 100K:
^COY,78 78K (memory added) + 22K (existing cache) = 100K
Print Cache Performance
For printing large characters, memory added to the cache by the ^CO
instruction is not physically added to the 22K cache already in the
printer. In the second example above, the resultant 100K cache is
actually two separate blocks of memory, 22K and 78K.
Since large characters need contiguous blocks of memory, a character
requiring a cache of 90K would not be completely stored because nei-
ther portion of the 100K cache is big enough. Therefore, if large char-
acters are needed, the ^CO instruction should reflect the actual size of
the cache you need.
Increasing the size of the cache will improve the performance in print-
ing scalable fonts. However, the performance will start to go down if
the size of the cache becomes large and contains too many characters.
The performance gained will be lost because of the time involved in
searching through the cache for all of the characters.
186 ZPL II COMMAND REFERENCE