Define the term BUFFER, giving an example of where a buffer is needed.(4)
With the aid of a diagram, explain the technique of double-buffering(4)
With the aid of a labelled diagram, explain ALL elements that are contained in a barcode
found on a product in a shop.(4)
Describe IN DETAIL the stage whereby details about a product held in a bar code can be printed on a customer receipt and the customer’s total bill updated. Describe the steps systematically and in order.(6)
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