Technical information

NewBIOS Reference Serial Solutions
Service 0H, Initialise.___________________
Compatibility._____________
This Service is fully compatible with the PC ROM BIOS.
Parameters.___________
AH = 00H Denotes service 0H
AL bits 7,6,5 Specify Baud rate as
= 0,0,0 110
= 0,0,1 150
= 0,1,0 300
= 0,1,1 600
= 1,0,0 1,200
= 1,0,1 2,400
= 1,1,0 4,800
= 1,1,1 9,600
AL bits 4,3 Denote parity
= 0,0 None
= 0,1 Odd
= 1,0 None
= 1,1 Even
AL bit 2 Denotes number stop bits
= 0 1 stop bit
= 1 2 stop bits (1.5 stop bits if 5 bit
word)
AL bits 1,0 Denote number data bits
= 0,0 5 data bits
= 0,1 6 data bits
= 1,0 7 data bits
= 1,1 8 data bits
DX = 0..31 Port number, 0=COM1...31=COM32
Chapter 5 Page 75