ANSI ASCII code

As the discussion on Moving Objects With the keyboard, use the ASCII code is also required in determining the motion of the object. For example, a keyboard you choose to move the object to the left then the ASCII code used for A is 65. From where do we get the ASCII code? for more details you can see some of the ASCII code below :

A = 65       B = 66         C = 67         D = 68         E = 69         F = 70          G = 71         H = 72       

I = 73

J = 74         K = 75        L = 76         M = 77        N = 78         O = 79         P = 80         Q = 81       

R = 82

S = 83        T = 84         U = 85         V = 86        W = 87        X = 88          Y = 89         Z = 90        

0 = 48