Revo

The Psion Revo is a PDA from Psion. It is the light version of Psion 5mx. It is software-compatible with 5mx and has the same processor but is more lightweight (200g vs 354g of 5mx), and smaller. more...

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In comparison with Series 5/5mx, Revo has smaller screen (480x160 vs 640x240 of Series 5/5mx) and also lacks a flash-card slot and a backlight. The Psion Revo comes in two main variants, Psion Revo and Psion Revo Plus having 8 and 16MB of RAM respectively.

SONICblue produced a rebadged version of the Psion revo Plus called the Diamond Mako in the United States.

Along with Enfour, Psion produced two versions of the Revo for the Chinese market called the 618C (Traditional Chinese) and 618S (Simplified Chinese).

Conan

Shortly before the demise of Psion in the commercial PDA market work had begun on a successor to the Revo, a 3rd generation PDA known by it's codename of Conan. The Conan ran Epoc Release 6 and was to feature support for Bluetooth and a backlight, although the former wasn't functional in the development builds.

Battery

Unlike the Series 5mx, which used 2 user-replaceable AA batteries, the Revo is powered by 2 built-in rechargeable AAA 700mAh NiMH batteries, which typically need to be replaced after about 3 years of service. After backing up all data, the batteries can be accessed by closing the unit, peeling off the Revo logo (using a screwdriver or similar if necessary), moving the 2 small pins that are behind it, and lifting up the silver part of the casing. The batteries are wrapped in black tape which can be removed starting from the left, taking care not to break the thermistor that it also encloses. It may not be possible to separate the batteries from their connectors without damaging the latter, which would then need to be replaced. Injury could result if separation is attempted with a blade. Replacement batteries must be taped in just as securely, otherwise resets could occur due to intermittent power loss. After replacing, the unit should be charged uninterrupted for at least 6 hours so the hardware can re-calibrate (as per instructions for a new unit).

Read more at Wikipedia.org