Fans find a ZX Spectrum program hidden on Radiohead's OKNOTOK cassette

The two minutes of high-pitched tones at the end of the C90 cassette in the OKNOTOK boxed edition are a program for the ZX Spectrum. Fans recognised the sound of the 8-bit British home computer of 1982, which loaded its software from tape. One of them equalised the audio to suit the Spectrum's format and ran it through an emulator.

The program is called “OK Computer Program” and is dated 19 December 1996, while the album was being made. It puts the names of the band and of Nigel Godrich on screen, with a message signed off With all our love¹.

Hidden in black-on-black squares in the program is a second message. Congratulations....you've found the secret message syd lives hmmmm. We should get out more.⁴