PORTIBM PC Portable (uses same BIOS as XT) 037C-037F - C&T F87000 Multi-Mode Peripheral Chip - OUTPUT PORTS 037C -W outputs driven to keyboard outputs COL7-COL0 037C R- inputs driven by keyboard pins ROW7-ROW0 037D -W outputs driven to keyboard outputs COL15-COL8 037E -W outputs driven to pins P2[7-1]; bit 0 enables UART(Universal Asyncronous Receiver/Transmitter) A peripheral device which converts a sequence of bytes into a serial bit stream at a programmable rate, and vice versa. This device is what makes an RS-232 serial port function. See also USART. clock when low 037F -W external output port