(a) A clothing shop uses a barcode reader at the checkout.
The checkout is linked to a stock control system. The system monitors stock levels and
automatically keeps them above a minimum level.
Explain how the stock control system automatically keeps the stock levels above a minimum
level.
(b) The software for the stock control system is stored on a central computer. The computer uses
random access memory (RAM), read only memory (ROM) and a hard disk drive (HDD).
The computer is a Von Neumann model computer system with a central processing
unit (CPU).
(i) State the purpose of the RAM, ROM and HDD in the central computer.
RAM
ROM
HDD
Memory Storage and Media Questions
Computer A is communicating with computer B.
(a) Draw an arrow or arrows to show simplex, duplex and half-duplex data transmission. The
direction of the data transmission must be fully labelled.
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