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