IBM PC CONVERTIBLE Technical Reference page 195

CASSETTE I/O:
READ/MODI FY
AH
=
0-3 AH
=
86H, CARRY SET
PORT NOT PRESENT
SYSTEM PROFILE: AH
=
40H
AL
=
0 READ
AL
=
1 MODIFY
BX,CX CONTAINS PROFILE
AL
=
2 READ MODEM CONFIG
AL
=
3 MODI FY MODEM CON FIG
BX,CX CONTAINS
PROFILE INFORMATION
PROFILE IS MODIFIED
AND EXECUTED
(REFER TO SYS_PROF PROLOG FOR DETAILS)
EXTERNAL EVENT: AH
=
41H
(REFER TO EXLEVENT PROLOG FOR DETAILS)
SYSTEM POWER OFF:
AH
=
42H
(REFER TO SYS_POWER_OFF PROLOG FOR DETAILS)
SYSTEM STATUS: AH
=
43H
(REFER TO SYS_STATUS PROLOG FOR DETAILS)
MODEM POWER: AH
=
44H
(REFER TO SYS_MODEM_POWER PROLOG FOR DETAILS)
KEYBOARD INTERCEPT:
AH
=
4FH
ENTRY CONDITION: AL
=
SCAN CODE OF KEY FROM I NT 9 (PORT 60)
EXIT CONDITION: CARRY SET IF INT 9 SHOULD PROCESS KEY
CARRY CLEAR IF INT 9 SHOULD NOT PROCESS
KEY BUT JUST ISSUE EOI AND EXIT LEVEL.
(RESERVED FOR OPERATING SYSTEM USE - THIS BIOS WILL RETURN WITH
CARRY SET TO
DEVICE OPEN:
DEVICE CLOSE:
PROGRAM
TERMINATION:
POST ON TIME
INTERVAL
JOYSTICK
SUPPORT:
SYSTEM REQ.
KEY CHANGE:
2-170 ROM BIOS
ENABLE INT 9 TO HANDLE KEY)
AH
=
80H
BX
=
DEVICE ID
CX
=
PROCESS I D
AH
=
81H
BX
=
DEVICE ID
CX
=
PROCESS ID
AH
=
82H
BX
=
DEVICE ID
AH
=
83H
AH
=
0 SET INTERVAL
ES. BX PTR TO BYTE IN CALLERS
STORAGE FOR POST NOTI FI CATON
CX,DX NUMBER OF MICROSECONDS TO
ELAPSE BEFORE POSTING.
IMMEDIATE RETURN
IMMEDIATE RETURN
IMMEDIATE RETURN
BIT 7 SET IN ES:-BX-
WH EN I NTERVAL HAS
ELAPSED
AL = I CANCEL THE INTERVAL POST POST IS CANCELLED
AH
=
84H
AH
=
85H
AL
=
00 - MAKE OF KEY
AL
=
01 - BREAK OF KEY
AH
=
86H, CARRY SET
PORT NOT PRESENT
IMMEDIATE RETURN