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Interrupt 14h	Initialize and Access Serial Port For Int 14


Int Function Description

---------==- ---------------------------------------------------------------

Int\14f\00 Initialize And Access Serial Communications Port

Int\14f\01 Send Character in AL to Comm Port DX (0 or 1)

Int\14f\02 Wait For A Character From Comm Port DX

Int\14f\03 Fetch the Status of Comm Port DX (0 or 1)

Int\14f\04 Extended Initialize (PC Convertible)

Int\14f\05 Extended Communication Port Control (PS/2)

All routines have AH=function number and DX=RS232 card number (0 based).

AL=character to send or received character on exit, unless otherwise noted.

serial status byte:

bits 0 delta clear to send

1 delta data set ready

2 trailing edge ring detector

3 delta receive line signal detect

4 clear to send

5 data set ready

6 ring indicator

7 receive line signal detect

line status byte:

bits 0 data ready

1 overrun error

2 parity error

3 framing error

4 break detect

5 transmit holding register empty

6 transmit shift register empty

7 time out note: if bit 7 set then other bits are invalid

port parameter byte


BBB baud rate: 110,150,300,600,1200,2400,4800,9600

PP parity: 01 = odd, 11 = even

S stop bits: 0 = 1, 1 = 2

LL word length: 10 = 7-bits, 11 = 8-bits

see also NS\16550AF National Semiconductor 16550AF Advantages & Detection

file: /Techref/int/14.htm, 1KB, , updated: 1999/2/20 10:27, local time: 2023/12/8 15:06,

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