I knew from my research that the cassette recorder functioned as the TRS-80’s "tape drive." It stored data as analog sound on magnetic audiotapes. When Halliday had first started programming, the poor kid hadn’t even had access to a floppy disk drive. He’d had to store his code on cassette tapes. A shoebox sat beside the tape drive, filled with dozens of these cassettes. Most of them were text adventure games: Raaka-tu, Bedlam, Pyramid, and Madness and the Minotaur. There were also a few ROM cartridges, which fit into a slot on the side of the computer. I dug around in the box until I found a cartridge with DUNGEONS OF DAGGORATH printed in crooked yellow text on its worn red label. The game’s artwork depicted a first-person view of a long dungeon corridor blocked by a hulking blue giant with a large stone ax.