The speaker begins by introducing himself as a game developer and a geek. He explains that his talk will focus on old computers and emulation. He mentions seven different old computer models and shares interesting facts and discoveries he made while experimenting with emulators. He talks about the Jupiter Ace and its similarity to the ZX81, the Dragon 32's use of black and white graphics to fit more data, the Game Boy's check for legitimate cartridges using the Nintendo logo, Pac-Man's screen corruption on level 256, ZX81's memory allocation and keyboard reading method using ports, Commodore 64's hidden ROMs and memory allocation, and the BBC Micro's hidden credits page. The speaker also briefly mentions other machines like the Amstrad, Japanese machines, and the Chip 8 emulator. The talk ends with a Q&A session.