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for ARM devices
Output Stream Status
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Byte
» OS_Byte 3
» Output Stream Status
| 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 (VDU extension vector) instead of VDU drivers |
| 6 | Disables printer, except for VDU 1,n? |
| 7 | Not used |
Notes
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.