UART chip which would work fine with 300, 1200, 2400 and 9600 baud modems. Almost every computer shipped (even today when everyone knows better) has this old slow chip. If you have a fast (V.32/V.32bis/HST/V.34/V.42/V.90) modem, and are experiencing dropped characters, CRC errors and aborted downloads, upgrade your serial port to a buffered UART (16550AFN). Look for 82x50B, 16x450 part numbers on the large 40-pin chips on the serial card to Gray Summit dial up access, Gray Summit, MO up access dial Gray SummitGray Summit up access, dial Missouri, Gray Summit dial up access
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