[<<Previous Entry]
[^^Up^^]
[Next Entry>>]
[Menu]
[About The Guide]
Int 14 Fn 1F - X00 Fossil - Extended Serial Port Status/control [S]
AH = 1Fh
AL = 00h read modem control register
Return: BL = modem control register (see below)
AH = status
AL = 01h write modem control register
BL = modem control register (see below)
Return: AX = status
DX = port number
Notes: this function is intended to exactly emulate the PS/2 BIOS AH=05h call
X00 forces BL bit 3 set (interrupts cannot be disabled)
See Also: AH=00h,AH=05h"SERIAL I/O"
Bitfields for modem control register:
bit 0 data terminal ready
bit 1 request to send
bit 2 OUT1
bit 3 OUT2 (interrupts) enabled
bit 4 LOOP
bits 5-7 reserved
This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
Written by Dave Pearson