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Int 14 Fn 00 - Serial - Initialize Port [S]
AH = 00h
AL = port parameters
bits 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps)
bits 4-3 parity (00 or 10 = none, 01 = odd, 11 = even)
bit 2 stop bits (set = 2, clear = 1)
bits 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8)
DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)
Return: AH = line status (see AH=03h)
FFh if error on Digiboard XAPCM232.SYS
AL = modem status (see AH=03h)
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
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