Lexmark C752 Technical Reference page 213

diskstatus
returns on the stack the following two integers:
• Number of pages that are free on the optional disk. The value of the Free
device parameter from the %disk1% IODevice.
• Total number of pages (1024 bytes) that are on the optional disk. The value
of the LogicalSize device parameter from the %disk1% IODevice.
This operator is equivalent to executing the following PostScript emulation
sequence:
(%disk1%) currentdevparams dup /Free get exch /LogicalSize get
Error: stackoverflow
displayoperatormsg
sets a custom paper message. The string parameter is used as a prompt string
when a page prints. The
string is cleared at the end of a print job.
Errors: stackunderflow, typecheck
doidlefonts
returns a constant boolean value of
Error: stackoverflow
4-30
value can be any string up to 16 characters. The
.
PostScript