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How do I check and configure serial ports under Linux for various purposes such as modem, connecting null modems or connect a dumb terminal?

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You need to use command called lsdev. It gathers information about your computer’s installed hardware from the interrupts, ioports and dma files in the /proc directory, thus giving you a quick overview of which hardware uses what I/O addresses and what IRQ and DMA channels. This command is very useful while troubleshooting various hardware conflict […]

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