=> R0 = VDU 23 option
R1 = pointer to VDU 23 queue
<= R0, R1 preserved
Whenever an unrecognised byte (18-25,28-31) is found following 23 in the VDU stream this vector is called. R0 contains this unknown byte - it is also the first of the 9 bytes in the VDU queue, pointed at by R1.
The default owner of this vector does nothing - unknown VDU 23 options are ignored.
See PRM 1, page 82.
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