=> R0 = plot command code
<= R0 preserved
Whenever an unrecognised byte is found following 25 in the VDU stream, or OS_Plot is called with an urecognised R0, then this vector is called. R0 contains this unknown plot command code - the current and 3 previous positions of the graphics cursor can be read with OS_ReadVDUVariables from variables &8C - &93, allowing custom plot routines to be implemented.
The default owner of this vector does nothing - unknown plot options are ignored.
See PRM 1, page 83.
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