A portable adapter that provides non-repudiable 
telecommunications services to bar-
code reading hand-held computers and palm-top or tablet-type mobile computers is disclosed. The adapter provides supplemental power supply and 
processing capacity that supports API communications functions, such as interactive voice recognition, conference calling, data 
encryption, VoIP packetization and other 
signal-format conversions that are not implemented on mobile computers. In particular, the device automatically logs IP packet identifiers and DOV dialing and status signals, without the user having access to edit this information, thereby providing a "non-repudiation" 
record of all communications. The adapter also supports intensive use of the host computer's 
serial port by supplementing the power available from the host computer's battery, or replacing that battery with a connector. For 
plant inspection and inventory auditing, ground-based cellular communications are implemented for supporting on-site work, including conference calling to discuss apparent pilferage or imminent safety hazards, and removable WORM 
recording media for documenting these discussions. For 
repair shop use, a standard phone jack or 10-base-T connector allows the device to upload engine test-data, with reports or estimates dictated by the mechanic to the 
repair shop's LAN 
server. For 
hospital use, the device includes removable WORM media for 
logging patient test results and examination reports. The hospital device also uses a dedicated local-area RF or IR 
transmitter, with location-specific 
encryption, to protect the privacy of lab reports received by the device, and to limit use of these devices to hospital's own premises.