VDU 2 enables the printer stream - characters in the range 8-13, 32-126 and 128-255 sent to the VDU drivers will also be sent to the printer device selected by OS_Byte 5. Multibyte VDU sequences are not sent to the printer (except for the argument ofVDU 1), and bytes are still sent to the printer stream when screen output is disabled with VDU 21.
VDU 3 disables the printer stream, and OS_Byte 117 can be used to read whether the printer stream is enabled.
OS_Byte 3 can be used to disable the printer stream independently of VDU 2 and 3 - in the output stream status bit 2 overrides VDU 2, and bit 6 must be clear for anything other than VDU 1 to send characters to the printer.
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