User`s guide

softwareiomode
Syntax: softwareiomode integer
Function Returns the current setting of the software i/o mode.
Default 200 (ESP)
Errors stackunderflow
setsoftwareiomode†
Syntax: integer setsoftwareiomode
Function Sets the software interface for communication between
the printer and the host computer to the value
designated by the setting argument. The settings are
0: PostScript mode
4: HP-GL (optional card)
5: HP PCL (Series II)
200: ESP
12: LN03 (optional card)
The new setting does not take effect until the end of the
current job. (The end of the job is defined by a ^D or a
timeout.) Only use this command when the printer is in
either ESP or PostScript mode.
Special Note This feature works for all interface ports. Selecting an
emulation that is unsupported on a specific host may
cause undesired results (for example, selecting HP PCL
for the AppleTalk interface).
Default Serial - 200 (ESP)
Parallel - 200 (ESP)
AppleTalk - Ø (PostScript)
Errors invalidaccess, rangecheck, stackunderflow, typecheck
Chapter 10
PostScript: Operator Dictionary 10-17