Technical information

NewBIOS Reference Serial Solutions
Service B3H, Get/Control buffers.______________________________
Compatibility._____________
NewBIOS service only, ignored by PC ROM BIOS.
Note The EASYC.C program contains sample C source code
to write directly into the buffers and demonstrates the
use of kickstart.
Parameters.___________
AH = B3H Denotes service B3H
DX = 0...31 Port number, 0=COM1...31=COM32
AL = 00H Denotes read status input buffer
AL = 01H Denotes read status output buffer
AL = 02H Denotes flush input buffer
AL = 03H Denotes flush output buffer
AL = 04H Denotes disable input buffer
AL = 05H Denotes disable output buffer
AL = 06H Denotes enable input buffer
AL = 07H Denotes enable output buffer
AL = 08H Denotes get input buffer addresses
AL = 09H Denotes get output buffer addresses
Return Values._____________
Subservices 00H read input buffer status:
AH = buffer disabled flag, true if buffer
disabled and false if buffer enabled
Chapter 5 Page 103