SECTION 6
Conversions and Interfaces
PEN*KEY
R
6100 Computer Programmer’s Reference Guide 6-67
INT 14h, Function AH = 05h: Extended Port Control
4000API
On Entry:
AH = 05h
AL = 0 = Read modem control register
1 = Write modem control register
BL = Modem control register value (if write):
7 = Ignore modem control signals, COM1 only
6-2 = Reserved
1 = RTS
0 = Data terminal only
DX = Communications port number
On Return:
AH = Line status (same as Function 00h)
AL = Modem status (same as Function 00h)
BL = Modem control register value (if read)
This is a nonstandard PC function. It may not be available in every PC BIOS.
Use caution where portability is a concern.
INT 14h, Function AH = FFh: Port Power Off or On
4000API
Turns off the communications port driver power.
On Entry:
AH = 0FFh
DX = Communications port number
AL = Turn communications port power
0 = Off
1 = On
On Return:
None
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
Summary of Contents for PEN*KEY 6100
Page 1: ...PEN KEYR 6100 Computer PROGRAMMER S REFERENCE GUIDE P N 977 054 001 Revision B December 2000 ...
Page 14: ...CONTENTS xii PEN KEYR 6100 Computer Programmer s Reference Guide ...
Page 22: ...Preface 8 PEN KEYR 6100 Computer Programmer s Reference Guide PREFACE ...
Page 318: ...GENERAL INDEX Index 6 PEN KEYR 6100 Computer Programmer s Reference Guide ...
