PORTIBM PC Portable (uses same BIOS as XT) 02F8-02FF - serial port, same as 02E8, 03E8 and 03F8 (COM2)

02F8  -W  transmitter holding register
02F8  R-  receiver buffer register
02F8  RW  divisor latch, low byte	when DLAB=1
02F9  RW  divisor latch, high byte	when DLAB=1
02F9  RW  interrupt enable register when DLAB=0
02FA  R-  interrupt identification register
02FB  RW  line control register
02FC  RW  modem control register
02FD  R-  line status register
02FF  RW  scratch register