IBM PC CONVERTIBLE

06BE
06BE
06BE
OE
06BF 07
06CO E8 0000 E
06C3 C3
06C4
06C4
06C4
IE
06C5 07
06C6 BF OOIC R
DISPLAY BROKEN ICON
SYS_BOOT ENDP
DSPLICON PROC NEAR
PUSH
CS
POP
ES POINT ES TO CODE SEGMENT
CALL ICON_PR
DISPLAY THE INSERT DISKETTE ICON
RET
DSPLICON
ENDP
THIS CODE WAITS FOR THE Fl KEY TO BE DEPRESSED OR THE TIME LIMIT EXPIRED
WHICH EVER COMES FIRST
KELWAIT PROC NEAR
PUSH OS
POP ES ; POINT ES TO DATA SEGMENT
MOV DI,OFFSET BUFFER_TAIL; GET ADDRESS OF BUFFER_TAIL
06C9 8A 3E OOIA R MOV BH,BYTE PTR BUFFEILHEAD ; GET DATA IN BUFFER HRAD
06CD BO 02
06CF E8 0000
06D2 72 22
0604 B4 00
06D6 CD 16
0608 80 FC 3B
06DB 74 00
0600 3C OC
06DF 75 E3
MOV AL, 02H COMPARE RETURN NOT EQUAL
USING BH AND DATA AT DI
CALL EXLEVENT WILL RETURN AFTER TIME LIMIT OR WHEN
THERE IS DATA IN KEYBOARD BUFFER
JC KW_EXIT I F TIMEOUT THEN JUMP
A KEY WAS HIT
MOV
INT
CMP
JE
AH,O
l6H
AH,3BH
FlBRK
OTHERWISE PURGE THE KEY
Fl KEY?
YES THEN WAIT FOR BREAK
CHECK FOR POWER ON SELF TEST LOOP MODE REQUEST
AL,OCH ; CNTL + L KEY?
KELWAIT ; NO THEN WAIT SOME MORE
06El C7 06 0072 R ABCD
CMP
JNE
MOV
JMP
RESELFLAG,LOOP_MODE ; SET POST LOOP MODE ACTIVE
06E7 E9 0000 E
06EA FB
06EB E4 60
06ED 3C 3B
06EF 74 F9
POSLLOOP ; EXIT BACK TO POST
WAIT FOR BREAK OF Fl KEY
Fl BRK:
IN
CMP
JE
STI
AL,KLDATA
AL,03BH
FlBRK
Fl KEY WAS DEPRESSED THEN RELEASED
ENABLE INTERRUPTS
READ KEYBOARD PORT
CHECK FOR STILL Fl KEY
WAIT UNTIL NOT Fl KEY MAKE
06Fl 80 OE 001 R 10
OR
BIOS_STATUS,BOOLFlHIT SET Fl HIT FLAG
RETURN TO CALLER
06F6
KW_EXIT:
06F6 C3
RET
06F7 KELWAIT ENDP
06F7 ROMCODE ENDS
END
2-142 ROM BIOS