     ROL: 41
     RTI: 42
     RTS: 43
+    SBC: 44
+    SEC: 45
+    SED: 46
+    SEI: 47
+    LDA: 48
+    LDX: 49
+    LDY: 50
+    TAX: 51
+    TAY: 52
+    TSX: 53
+    TXA: 54
+    TXS: 55
+    TYA: 56
 
 Interrupt =
     IRQ:   1

            tick()
            tick()

    registerInstruction: (instruction, execution) ->
        @instructionsTable[instruction] = execution


    compareRegisterAndMemory: (register, address) -> 
        operand = @readByte address
        result = register - operand 
        @carryFlag = result >= 0
        @computeZeroFlag result
        @computeNegativeFlag result

