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what do you want to do? Add a serial port to yout DSP? In this case, you
can use a UART like the 16C550 (National, includeing FIFO). This chip has
a 8bit databus and include 8 registers that you can access from your DSP.
The other side you need a digital to RS-232 pegelconverter like a MAX232.
The connection of the UART to the DSP depends heavily on the DSP you
are using. Mostly you have to insert wait states. Which device do you use?