Smart contracts are not magic: 03 show me the code
Ethereum is not magic, aka. Smart contracts, The Hard Way
Chapter III., show me the code
https://ethervm.io/
6001 PUSH1 0x01
6002 PUSH1 0x02
01 ADD
6000 PUSH1 0x00
52 MSTORE
6020 PUSH1 0x20
6000 PUSH1 0x00
F3 RETURN