RV120:
	MOV A,yerror		;put value of variable yerror into accumulator A
	MOV B,#0			;put 0x00 into B
	MOV R3,#59			;put 0x3B into register R3
	MOV R4,#0			;put 0x00 into register R4
	LCALL ?ugt			;call subroutine (not sure what ?ugt is)
	JNZ RV123			;jump to RV123 if accumulator A is not zero
	LJMP RV122			;else long jump to RV122