Built-in computer audio interfaces tend to be very limited, often just two one-eighth-inch jacks, one for an unbalanced microphone input and the other an output for stereo headphones. So what to do ...

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Claimed as easy to use, the E5805A USB-to-RS232 interface can connect up to four RS232 test instruments to the USB port on a personal computer at baud rates up to 230 Kb/s per serial port. No external ...