 the jump
  instruction at the top with a jump instruction to offset 0x330 where
  we then place the machine code for our welcome message.  This new
  machine code prints the welcome message and then jumps to offset
  0x2298 allowing the remainder of the program to execute as usual.
</p>
<p>
  The debugger command <code>A</code> is used to assemble the machine
  code for the altered jump instruction at the top.  By default it
  writes the assembled machine code to CS:0100 which is the address at
  which DOS