Data commit

Task/Arithmetic-Integer/6502-Assembly/arithmetic-integer.6502

@@ -0,0 +1,48 @@
+Arithmetic:	PHA			;push accumulator and X register onto stack
+		TXA
+		PHA
+		JSR GetUserInput	;routine not implemented
+		;two integers now in memory locations A and B
+		;addition
+		LDA A
+		CLC
+		ADC B
+		JSR DisplayAddition	;routine not implemented
+
+		;subtraction
+		LDA A
+		SEC
+		SBC B
+		JSR DisplaySubtraction	;routine not implemented
+
+		;multiplication - overflow not handled
+		LDA A
+		LDX B
+Multiply:	CLC
+		ADC A
+		DEX
+		BNE Multiply
+		JSR DisplayMultiply	;routine not implemented
+
+		;division	- rounds up
+		LDA A
+		LDX #0
+		SEC
+Divide:		INX
+		SBC B
+		BCS Divide
+		TXA			;get result into accumulator
+		JSR DisplayDivide	;routine not implemented
+
+		;modulus
+		LDA A
+		SEC
+Modulus:	SBC B
+		BCS Modulus
+		ADC B
+		JSR DisplayModulus	;routine not implemented
+
+		PLA			;restore accumulator and X register from stack
+		TAX
+		PLA
+		RTS			;return from subroutine