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He was the original founder (in 1985) and main inventor of the pocket PC which became the Atari Portfolio (originally known as the "DIP Pocket PC") in 1989. DIP Research Ltd. was acquired by Phoenix Technologies in 1994.
His interest in PDAs was sparked from his early times at Psion, working on the first Organiser products.
He was also the original instigator of the PC Card (formerly "PCMCIA Card") movement. This came about from his decision to use the then-emerging credit card memories in the design of the Atari Portfolio. On founding Poqet, and with major investment from Fujitsu, a decision was made to use the 68-pin JEIDA card. He successfully persuaded the board of Poqet to set up an industry standards organization, PCMCIA, to promote this as a standard.
- Cullimore, Ian (1987). Communicating with Microcomputers. Wilmslow, Cheshire, UK: Sigma Press / John Wiley & Sons. ISBN 1-85058-055-3.
- Lewis, Peter H. (1989-11-14). "Personal Computers: Heroes of the Information Revolution". New York Times. Archived from the original on 2018-01-17. Retrieved 2018-01-17.
- "Phoenix Technologies acquire DIP Research". Computer Business Review (CBR). 1994-07-11. Archived from the original on 2018-01-17. Retrieved 2013-04-29.
- Cullimore, Ian (2015). "Ian Cullimore PhD CV". Archived from the original on 2018-03-17. Retrieved 2018-03-17.
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