The NES CPU Can’t Multiply. It Ran Super Mario Anyway.

The chip inside the NES has no multiply instruction. It also ran Super Mario Bros. Here's how, one tick at a time, using a 6502 emulator I wrote in C. 0:00 A chip that cannot multiply 0:48 Why Nintendo bought the cheap one 1:54 One tick, one tiny step 3:15 Decoding is just looking it up 4:06 Three hands 4:54 A row of yes/no lamps 5:49 Three times ten, the long way 7:26 How I know it's right 8:28 Zoom out, and the next question The full source of the emulator, in C: https://github.com/TickByTickDev/NES-Emu Tick by Tick: maths, physics and code, one tick at a time.