How does a calculator work? The magic of the 8-digit four function calculator

How does a digital calculator work? In this video we take an in-depth look at the full capabilities of ultra cheap calculators, the legacy origin of their hardware and a full functional diagram of the artithmatic engine.

Questions to answer in the comments:
1) Why are multiplications in constants handled differently than all the other operators? 15:40
2) Why does an 8-digit calculator get stuck in a lock state as demonstrated? 1:38:42
3) A request for more awesome calculations performed on and details about ultra cheap 8-digit calculators. 1:40:35

--Table of contents--
Why this video? 0:30
Prerequisites 1:18

PART 1: Calculations 2:19

Negative numbers 2:25
AC/CE/C/CI 3:24
Using invisible buttons :-) 5:57
Determine calculator deviation 8:54

1. Basic operations 11:10
2. Iterations 12:34
3. Constants 14:37
4. Square 18:36
5. Square root 20:23
6. Fractions, reciprocals, inverse values 23:43
7. Exponentiation 27:51
8. Log (woohoo!!) 31:18
9. Percentages 38:45
10. Memory functions 42:56

PART 2: Hardware 50:42

11. Casing 50:48
12. Battery & Power 53:38
13. Keypad 1:00:03
14. LCD Display 1:05:24
15. Processor/CPU 1:12:07
16. Storage 1:25:18
17. Internal computer language 1:30:20

PART 3: Functional diagram 1:31:42

18. Errors, locks and bugs 1:36:53

Request for additional details and calculations 1:40:35

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