How a calculator works

1+3=4

0001+0011=0100

  • Random Access Memory (RAM)
  • 0 = electricity off, 1 = electricity on
  • Press key 1 encode 1 to binary signal 0001 to RAM display 1
  • Press key + store command add to RAM
  • Press key 3 encode 3 to binary signal 0011 to RAM display 3
  • Press = Process with Arithemetic Logic Unit (ALU) Sum total = 0100
  • Decode 0100 to a number display 4
  • How a calculator works http://www.youtube.com/watch?v=rqTqWNakKKs

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