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Amstrad PPC640 Troubleshooting Guide
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== Modem == * Amstrad says not to use the modem on battery power.<ref name="ppcui" /> * Software must address the modem as COM2 (2F8h, IRQ3).<ref name="trm" /> * The modem board takes its β5 V from the main supply; check that rail if the modem does not respond.<ref name="ppcsm" /> * On British machines the line plugs into the BT 431A connector in the covered compartment to the right of the LCD; US machines have LINE and PHONE sockets at the rear.<ref name="trm" /><ref name="ppcui" />
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