ls must end with a Colon: </p>
<h3>INC BL</h3>
<p>This command adds one to BL. Watch the BL register. It will count up from 40 
  in hexadecimal so after 49 comes 4A, 4B, 4C, 4D, 4E, 4F, 50, 51 and so on. </p>
<h3>Overflow</h3>
<p>When BL reaches 7F hex or 127 in decimal numbers the next number ought to be 
  128 but because of the way numbers are stored in binary, the next number is 
  minus 128. This effect is called an <strong>OVERFLOW.</strong> </p>
<h3>Status Register (SR)</h3>
<p>The status r