 every pass of a loop.
<P>
Now, when we are in the loop, the first thing is to read the next opcode, 
and modify the program counter:
<FONT COLOR=#000080><PRE>OpCode=Memory[PC++];</PRE></FONT>
While this is the simplest and fastest way to read from the emulated
memory, it is not always possible for following reasons:
<UL>
<LI>Memory may be fragmented into switchable pages (aka banks)
<LI>There may be memory-mapped I/O devices in the system
</UL>
In these cases, we can read the emulated memory via
<CODE>Read