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 [[]VDU Extension Vector | VDUXV]] (VDU extension vector) 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.