8250, 16450 Asynchronous serial interface controller. +--------------+ D0 |1 +--+ 40| VCC D1 |2 39| /RI D2 |3 38| /DCD D3 |4 37| /DSR D4 |5 36| /CTS D5 |6 35| MR D6 |7 34| /OUT1 D7 |8 33| /DTR RCLK |9 32| /RTS SIN |10 16450 31| /OUT2 SOUT |11 8250 30| INTR CS0 |12 29| CSOUT CS1 |13 28| A0 /CS2 |14 27| A1 /CLKOUT |15 26| A2 X1 |16 25| /ADS X0 |17 24| /WR |18 23| DDIS WR |19 22| RD GND |20 21| /RD +--------------+ [This information is part of the GIICM]