Int 14 Fn 00  - Serial - Initialize Port                                   [S]

   AH = 00h
   AL = port parameters (see #0226)
   DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)

Return: AH = line status (see #0230)
       FFh if error on Digiboard XAPCM232.SYS
   AL = modem status (see #0231)

Notes: default handler is at F000h:E739h in IBM PC and 100% compatible BIOSes
   since the PCjr supports a maximum of 4800 bps, attempting to set 9600
     bps will result in 4800 bps
   various network and serial-port drivers support the standard BIOS
     functions with interrupt-driven I/O instead of the BIOS's polled I/O
   the 04/08/93 Compaq system ROM uses only the low two bits of DX

See Also: AH=04h"SERIAL",AH=04h"MultiDOS",AH=05h"SERIAL",AH=57h

See Also: AX=8000h"ARTICOM",AH=81h"COMM-DRV",AH=82h"COURIERS",AH=8Ch

See Also: MEM 0040h:0000h,PORT 03F8h"Serial"

Bitfields for serial port parameters:
Bit(s) Description (Table 0226)
 7-5   data rate (110,150,300,600,1200,2400,4800,9600 bps)
 4-3   parity (00 or 10 = none, 01 = odd, 11 = even)
 2 stop bits (set = 2, clear = 1)
 1-0   data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8)

See Also: #0228,#0233,#0234,#0235