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There are four chips each of $1024\:\text{bytes}$ connected to a $16\:\text{bit}$ address bus as shown in the figure below. $RAMs\: 1, 2, 3$ and $4$ respectively are mapped to addresses

  1. $0C00H-0FFFH, 1C00H-1FFFH, 2C00H-2FFFH, 3C00H-3FFFH$
  2. $1800H-1FFFH, 2800H-2FFFH, 3800H-3FFFH, 4800H-4FFFH$
  3. $0500H-08FFH, 1500H-18FFH, 3500H-38FFH, 5500H-58FFH$
  4. $0800H-0BFFH, 1800H-1BFFH, 2800H-2BFFH, 3800H-3BFFH$
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