PORTIBM PC Portable (uses same BIOS as XT) 0300-0301 - MPU-401 MIDI(Musical Instrument Digital Interface) A standardized interface for controlling musical instruments with a computer. 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.
Range:	alternate address at PORTIBM PC Portable (uses same BIOS as XT) 0330h, occasionally at PORTIBM PC Portable (uses same BIOS as XT) 0310h or
	  PORTIBM PC Portable (uses same BIOS as XT) 0320h