The cassette delivered stutters of data—bursts of audio that might have been music if not for the blips that crawled like ants across the waveform. He fed the recording to his battered laptop and loaded the open-source ZX emulator he used to coax life from vintage code. Somewhere on the forum someone had mentioned a decoder, and Tomás had rebuilt one from fragments: a few scripts, a handwritten README, a patch he’d compiled himself. He called it ZXCopy in homage.