| 摘要 |
Portable device, such as a radio pager, having a battery housing or retainer accessible from outside the housing, and a socket for a plug-in module for controlling the device to be inserted through the battery opening. The plug-in module can be a code plug which cooperates with a decoder chassis for controlling the particular code for the device. The decoder chassis is provided on a main chassis connected to the battery retainer, and is held in position by the retainer when the code plug is inserted into or extracted from the socket on the decoder chassis. The decoder chassis can include a semiconductor die having circuits suitable for use in a plurality of different coding schemes. An opening in the battery retainer provides a passage for laser programming of the die through the battery opening after the device is completely assembled and in operative condition.
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