- 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 https://www.youtube.com/watch?v=rqTqWNakKKs
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