Autopsy:

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from Wikipedia:

The Atari Portfolio is the first PC-compatible palmtop computer, and was released by Atari Corporation in 1989. The Portfolio was licenced from Distributed Information Processing (DIP) based in Guildford, Surrey, England. The original founding member of DIP was Ian Cullimore, fresh from his experiences at helping design the early Organiser products at Psion.

DIP officially stood for “Distributed Information Processing”, although secretly it actually stood for “David, Ian and Peter”, the three founding members of the company, all ex-Psion. The original founder of the company (first called “Crushproof Software”) was Ian Cullimore, and the other two David Frodsham and Peter Baldwin. It was built around an Intel 80C88 CPU running at 4.9152 MHz and ran a variant of MS-DOS called “DIP DOS 2.11″. It had 128 kB of RAM and 256 kB of ROM which contained the OS and built-in applications. The on-board RAM had to be divided between system memory and local storage (the C: drive). The LCD was monochrome without backlight and had 240×64 pixels or 40 characters x 8 lines.

source: wikipedia