=> R1 = &51 (reason code)
R2 = mode number
R3 = monitor type
<= R1-R3 preserved to pass on else
R1 = 0 (to claim service)
R2 = substitute mode
R3 preserved
This service is issued by OS_CheckModeValid or a mode change when the monitor type is unknown by RISC OS, and the mode is not available with the current monitor type (as already ascertained by Service_ModeExtension).
See PRM 1, page 624
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