IBM Infoprint 1125 User Reference page 136

PS SmartSwitch
Purpose:
To configure the printer so it automatically switches to PostScript emulation when a print job received
through the LocalTalk port requires it, regardless of the default printer language.
Values:
On*
Off
See also:
PCL
Argecy Computer Corporation 248-324-1800
Printer examines data on the LocalTalk interface and selects PostScript emulation if the data
indicates that is the required printer language.
Printer does not examine the incoming data. The printer uses PCL emulation to process the
job if PCL SmartSwitch is On, or uses the default printer language specified in the Setup
Menu if PCL SmartSwitch is Off.
SmartSwitch; Printer Language
133