=> R0 = 126 (&7E)
<= R0 preserved
R1 = 0 if no escape condition
255 if escape condition cleared
R2 corrupted
This call attempts to clear an escape condition. If an escape condition exists, it performs the escape condition side effects if these have been enabled with OS_Byte 230, and then calls the escape handler to indicate that the escape has been cleared.
See PRM 1, page 868
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