=> R0 = 117
<= R0 preserved
R1 = status flags
This call returns the content of the VDU status byte. This byte gives information on the way in which characters are output.
See PRM 1, page 645
VDU Status
Bit Status when set
0 Print output enabled by VDU 2
1 Unused
2 Paged scrolling selected by VDU 14
3 Text window in force i.e. software scrolling
4 In a shadow mode
5 In VDU 5 mode
6 Cursor editing in progress
7 Screen disabled with VDU 21
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