Amstrad PPC512
Atari Portofolio
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Walkstation 386 SX
Wind Hybrid Luxury

Atari Portofolio
Atari, 1989
CPU: Intel 80C88-Prozessor @ 4,9MHz
Memory: 64 KB (external card)
Operating System: DOS 2.1
Atari Portfolio HPC-004 was the first palmtop computer.
The computer has a battery powered external memory card.
It was presented by the Atari Company and having the size of a VHS cassette and the weight of just few hundred grams HPC-004 became a predecessor of PDAs.
The computer is in most aspects compatible with IBM PC that made it universal. With its built-in programs that could be started with the function keys HPC-004 could be used for storing addresses and managing appointment dates, typing a text and processing tables.
With external software it could be used for programming, playing games, calculation of taxes and calculations using formulas.
The built in DIP-DOS (MS-DOS 2.11) compatible OS made the use of MS-DOS compatible applications possible.
As external memory Atari offered memory cards powered with a flat lithium battery (Bee-Cards) with memory capacities 32-128KB.