IBM PC CONVERTIBLE

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