=> R0 = byte send to the VDU
<= R0 preserved
C set if byte is to be sent to printer
If bit 5 of the output stream flag has been set then characters which would have been sent to the display are routed to this vector instead. Characters sent to other output streams (e.g. *Spool file, printer) are unaffected.
If the C flag is set on return, then the character (unless it is the printer ignore character (see OS_Byte 6)) is sent to the VDU printer stream (if bits 2 and 6 are clear in the output stream flag). This is independent of the setting of bit 3 in the output stream flag. The PRM is not clear as to whether this can send the byte twice if bit 3 is set (printer enabled). Confused? :-)
See PRM 1, page 83.
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