=> R0 = 5
R1 = printer driver type
<= R0 preserved
R1 = previous printer driver type
R2 corrupted
This call determines the path to use for printer output. The type may be read (and written) with OS_Byte 245. Values in the range 0-7 can be set as the default type in CMOS byte 15 and *Configure Print.
If a serial printer is in use, setting bit 0 in OS_Byte 3 will mean that the characters are printed twice.
See PRM 1, page 508
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