IBM PC CONVERTIBLE

INVALID FUNCTION CODE RETURN POINT
0079 INLFUN:
0079 B4 86 MOV AH,86H
SET BAD COMMAND RETURN CODE
007B
F9 STC
SET CARRY FLAG ON - ERROR
007C
IMM_RET:
007C CA 0002 RET 2
RETURN WITH CURRENT FLAGS
007F SYS_SERVICES ENDP
007F JOYSTICK PROC NEAR
007F B4 86
MOV AH,86H
SET JOYSTI CK NOT SUPPORTED
0081 F9
STC
SET CARRY FLAG - ERROR
0082 C3
RET
0083 JOYSTI CK ENDP
System Profile Services (SYS_PROF)
INT 15H
ROUTINE-NAME: SYS_PROF (AH = 40H)
FUNCTION: ROUTINE TO ALLOW READ/MODIFY OPS ON THE SYS PROFILE
INFORMATION. SYS PROFILE IS STORED IN CLK CHIP RAM.
INPUT: AL = 0 READ SYSTEM PROFILE INTO BX AND CX
AL = 1 MODIFY SYSTEM PROFILE FROM BX AND CX
AL = 2 READ MODEM SWITCH SETTING INTO BX
AL = 3 WRITE MODEM SETTINGS FROM BX AND TURN ON MODEM
DEFINITION OF BITS IN SYSTEM PROFILE REGISTERS (AL = 0,1)
BH: BIT 7 - 0 = SET SYSTEM COLD START MODE
*1 = SET SYSTEM WARM START MODE
BIT 6 - 0 = DISABLE LOW BATTERY WARNING MESSAGE
*1 = ENABLE LOW BATTERY WARNING MESSAGE
BITS 5,4 - INITIAL VIDEO MODE
00 = RESERVED
01 = 40 X 25 MONOCHROME USING CGA/LCO
*10 = 80 X 25 MONOCHROME USING CGA/LCD
11 = 80 X 25 MONOCHROME USING MONO/LCD
BITS 3,2 - *00 = IGNORE LCD HIGH INTENSITY ATTRIBUTE
01 = MAP LCD HIGH INTENSITY TO UNDERSCORE
10 = MAP LCD HIGH INTENSITY TO REVERSE VIDEO
11 = MAP LCD HIGH INTENSITY TO ALTERNATE FONT
BIT 1 - *0 = INTERNAL MODEM NOT AVAILABLE ON BATTERY PWR
1 = INTERNAL MODEM AVAILABLE ON BATTERY POWER
BIT 0 - *0 = RS232/PARALLEL NOT AVAILABLE ON BATTERY
1 = RS232/PARALLEL AVAILABLE ON BATTERY
BL: BITS 7-0 RESERVED
CH: BITS 7-0 - KEYBOARD INACTIVITY TIME BEFORE LCD BLANKING.
(TIME IN MINUTES, *0 = DISABLE BLANKING).
ROM BIOS 2-173