=> R0 = printer driver number
or -1 to set no current driver
or -2 to read
<= R0 = previous printer driver number
or -1 if there was no current driver
This SWI specifes the current printer driver, and should only be used by the Printer application. If you really feel the urge to use this call, read the current setting and try to restore it when you finish.
See PRM 3, page 643.
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