ocr: OS_WriteC Bit 3 set Bit 1 clear Bit 5 set Bit 5 clear VDUXV VDU2 mode returns with C=1 Not in a VDU Character n sequence inaVDU 1,n Character in range 8-13, 32-126, or 128-255 Bit 6 clear Not printer ignore character (if any) Bit 2 clear Printer
