Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Psychedelia is an early light synthesizer developed by Jeff Minter and published by Llamasoft in 1984. It was converted to the MSX and ZX Spectrum by Simon Freeman. Psychedelia allowed a user to generate a light show on the screen grid, using the joystick to send pulses or bursts of coloured squares. There are various preset settings, or the user can manually set the variables controlling the pulses. Patterns can be recorded to memory or tape for later playback. Unlike Minter's later synthesizers such as Neon, Psychedelia does not use audio as a factor, only using a joystick's input. It is, however, intended to be played in accompaniment to music. Minter had been considering "dynamic interactive pattern generators" but hadn't coded any previously. An idea for an algorithm came to him, in which patterns would be seeded along a path, which would then expand and change shape and colour over time.

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