=> R0 = mode number to check
<= if C flag unset mode is valid and R0 preserved
if C flag set the mode is invalid
R0 = -1 if mode is non-existent
-2 if not enough memory
R1 = mode that would be used
-2 if unable to select alternative mode
This finds out, whether you may change to a given mode or its invalid, either because the monitor type forbids it, R1 then is the alternative mode, or there's not enough memory in this case R1 = -2.
See PRM 1, page 715.
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