Varios-PDA

Released in 1994, the optimistically named “DeskTop Replacement 1” is an early pen-based, mobile computer. Like the NCR 3125 3 years earlier it’s a PC that you can carry in your hand and that you can operate using a pen as a mouse. Of course, the DTR-1 used updated hard- and software, but the idea is the same. Therefore, the architecture of these devices did not allow much freedom and required a desktop-class performance CPU. As a result, all these devices are the most heavy mobile pen computers with a weight almost twice as much as the one of an Apple Newton or a Magic Cap-based PDA. Not only were they heavy, the PC architecture also meant that the price was double or triple the price of a Newton or a Magic Cap device (a similar problem exist nowadays
in a lesser form for Windows-based tablets as opposed to Android-based tablets). The upside of the used PC architecture was that it sported all the standard interfaces also found on desktop PCs.

The EO is an early commercial tablet computer that was created by Eo, Inc. (later acquired by AT&T Corporation), and released in April 1993.[1] Eo (Latin for I go) is the hardware spin-out of GO. Officially named the AT&T EO Personal Communicator, it is similar to a large personal digital assistant with wireless communications,[2] and competed against the Apple Newton. The unit was produced in conjunction with David Kelley Design, frog design, and the Matsushita, Olivetti and Marubeni corporations.

Two models, the Communicator 440 and 880, were produced and measure about the size of a small clipboard. Both are powered by the AT&T Hobbit chip, created by AT&T specifically for running code written in the C programming language. They feature I/O ports such as modem, parallel, serial, VGA out and SCSI. The devices come with a wireless cellular network modem, a built-in microphone with speaker, and a free subscription to AT&T EasyLink Mail for both fax and e-mail messages.

The operating system, PenPoint OS, was created by GO Corporation. Widely praised for its simplicity and ease of use, the OS did not gain widespread use. The applications suite, Perspective, was licensed to EO by Pensoft.

My Life Online (Mylo) was a device created and marketed by Sony for portable instant messaging and other Internet-based communications, browsing Internet web sites using the Opera web browser and playback and sharing of media files. The pocket-sized, tablet-shaped handheld device, which debuted in 2006, had a screen which slid up to reveal a QWERTY keyboard. The brand name Mylo means My Life Online. Using Wi-Fi instead of cellular networks, the Mylo was targeted to the 18–24 age group.

By using WiFi networks for Internet connectivity, Mylo provided users with the possibility of reducing connectivity costs by avoiding the necessity of using GSM, CDMA or 3G cellular networks which would usually be used for devices of this size and functionality.

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