Bit Stream affected
0 Enables serial driver
1 Disables VDU drivers
2 Disables VDU printer stream
3 Enables printer (regardless of VDU state)
4 Disables spooled output
5 Calls VDUXV instead of VDU drivers
6 Disables printer, except for VDU 1,n
7 Not used
Bit 1 is not the same as VDU 21 - with VDU 21 bytes are still sent to the printer if it has been enables with VDU 2.
Bit 3 is not the same as VDU 2 - when set (and bits 2 and 6 clear!) all bytes except the printer ignore character (see OS_Byte 6) are sent to the printer stream.
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