There is a serial in/out on the connector at the base of the X50/X51, but there is also USB slave I/O. The usb is NOT converted to serial for transmission to the computer, it can be set up for serial style data over USB for activesync use though.
http://pinouts.ru/PDA/dell_axim_pinout.shtml
I've been curious about CardExport speed benefits, does anyone have any data benchmark tests?
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pencil and paper: n.An archaic information storage and transmission device that works by depositing smears of graphite on bleached wood pulp. More recent developments in paper-based technology include improved ‘write-once’ update devices which use tiny rolling heads similar to mouse balls to deposit colored pigment.
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