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The ST BOOK is a portable computer released in 1991 by Atari. It was based on the Atari STE. The ST BOOK was vastly more portable than the previous Atari portable the STacy but it sacrificed several features in order to achieve this: notably the backlight and internal floppy disc drive.The screen is highly reflective. It supports the 640×400 1-bit mono mode only and no external video port was provided.