In the example above, data memory 200
(DM200) initially holds the constant (number) 0000. Each time the operator pushes
button 0000 the difu instruction will turn on (become true) FOR
ONE SCAN. When this happens we load the constant(number) 2222 and move
it into data memory 200(DM200). Not a very useful application by itself but it
should show what the instruction pair does. In later chapters you'll see that
this is an invaluable instruction.
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