SECTION 6
Conversions and Interfaces
6-66 PEN*KEY
R
6100 Computer Programmer’s Reference Guide
INT 14h, Function AH = 04h: Extended Initialize
BIOS, 4000API
Programs the Baud Rate Register and Byte Format Register for the selected port
and return values of the Line Status Register and Modem Status Register.
On Entry:
AH = 04h
DX = Communications port number
BH =Parity setting:
0 = None
1 = Odd
2 = Even
BL = Stop bits:
0 = One
1 = Two
CH =Word length:
2 = 7 bits
3 = 8 bits
CL = Baud rate:
0 = 110
1 = 150
2 = 300
3 = 600
4 = 1200
5 = 2400
6 = 4800
7 = 9600
8 = 19200
9 = 38400
10 = 57600
11 = 115200
12 = 125000
13 = 250000
14 = 500000
On Return:
AH = Line status (same as Function 00h)
AL = Modem status (same as Function 00h)
This is a nonstandard PC function. It may not be available in every PC BIOS.
Use caution where portability is a concern.
6. Conversions and
Interfaces
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