HP PCL 5 Reference Manual page 165

Printing a Character
When an unbound font is selected for printing and a character code is
received, the printer accesses the requested symbol set mapping
table to identify the MSL or Unicode number. For example, if the
Roman-8 symbol set is selected and the printer receives character
code 254, the printer accesses the Roman-8 symbol set mapping
table (Table 9-1). In the Roman-8 mapping table, character code 254
is mapped to MSL number 191 or Unicode number 00b1
(plus-over-minus symbol). Thus, to print character code 254, the
printer searches the selected unbound font for the correct MSL or
Unicode number and prints that character.
Unbound Scalable Fonts 9-13
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