IBM PC CONVERTIBLE

063C 74 08
063E 8D 0000 E
0641 E8 06BE R
0644 EB El
JE
MOV
CALL
JMP
TO_l YES THEN REDISPLAY ICONS
BP ,OFFSET DSKLICON OTHERWISE JUST MOVE DISKETTE
DSPLICON
H3_2 WAIT AGAIN
CHECK FOR Fl HIT AND IF SO THEN RETRY DISKETTE
0646 TO_I:
0646
F6 06 0016 R
10
TEST BIOS_STATUS,BOOLFlHIT ; Fl KEY WAS HIT?
064B 75 07 JNZ TO_3 NO THEN KEEP DISPLAYING ICONS
0640 B3 14 MOV
BL,20
.DELAY LONGER FOR NO DISKETTE
064F E8 06C4 R CALL
KELWAIT
WAIT TIME
0652 EB Cl JMP SHORT H3_1 GO RE DISPLAY ICONS
0654 E9 05Bl TO_3:
JMP RETRLBOOT GO RETRY BOOT
USER WANTS BASIC OR CONTROLLER FAILURE
0657
0657
80 26 0016 R EF
065C E8 0000 E
065 F E8 0000 E
0662 CD 18
HBASIC:
AND
CALL
CALL
INT
BIOS_STATUS,NOT BOOLFlHIT ; RESET Fl HIT FLAG
DSP_INIT CLEAR THE DISPLAY
DSP_FSETM ; SET MODE TARGET DISPLAY
18H ; GO TO RES I DENT BAS I C
I PL WAS SUCCESSFUL
NOW CHECK BOOLLOCN FOR NON ZERO DATA
0664
0664
BF 7COO R
0667 B9 OOOA
066A 26: Al 7COO
066E OB CO
0670 74 lA
H4:
MOV
MOV
MOV
OR
JE
DI,OFFSET BOOLLOCN
CX,10
AX, WORD PTR BOOLLOCN
AX,AX
HI0 I F ZERO BAD BOOT RECORD
NOW CHECK NEXT 10 WORDS FOR NOT EQUAL
0672 83 C7 02
0675 26: 3B 05
0678 E1 F8
067A 74 10
067C 80 26 0016 R EB
0681 E8 0000 E
0684 E8 0000 E
0687 EA 7COO ---- R
H4_LP: ADD DI,2
CMP AX, ES: [DI]
LOOPZ H4_LP ; LOOP I F DATA SAME
JZ HIO ; BAD BOOT RECORD I F ALL DATA SAME
AND
CALL
CALL
JMP
BIOS_STATUS, NOT BOOLFIHIT+DCL_SUPPORTED ; RESET BIOS FLAGS
DSP_INIT ; CLEAR THE DISPLAY
DSP_FSETM ; CLEAR THE TARGET DISPLAY
BOOLLOCN
; SHOW DISKETTE EXITING DRIVE AND SPLITTING APART
068C 80 26 0016 R EF HI0: AND BIOS_STATUS, NOT BOOLFIHIT ; RESET KEY HIT FLAG
0691 BA 0621
0694
0694
52
0695 BA OllF
0698 BD 0000 E
069B E8 06BE R
069E 5A
069F FE C6
06Al B3 05
06A3 BD 0000
06A6 80 FE OE
06A9 75 05
06AB BD 0000 E
06AE B3 28
0680
0680
E8 068E R
0683 E8 06C4 R
0686 80 FE OE
06B9 75 D9
068B E9 060C R
MOV
HI0_2 :
PUSH
MOV
MOV
CALL
POP
INC
MOV
MOV
DX,0621H START INITIAL DISPLAY
DX SAVE DISKTETTE POINTER
DX,OllFH ; DX POINTS TO DISPLAY POSITION
BP,OFFSET SYS_DSKLICON ; POINT TO THE DISKETTE ICON
DSPLICON
OX
DH
BL,05 ; SET TIMEOUT TO 275 MSECS
BP ,OFFSET DSKLICON ; WITH GOOD DISKETTE ICON
CHECK FOR LAST POSITION FOR DISKETTE BEFORE BROKEN DISKETTE IS SHOWN
CMP
JNE
MOV
MOV
HI0_3 :
CALL
CALL
CMP
JNE
JMP
DH ,OEH
HI0_3 ; YES THEN DISPLAY BROKEN ICON
BP ,OFFSET BAD_DSKLICON ; OTHERWISE SHOW BAD DISKETTE
BL,40 TIME DELAY FOR BROKEN DISKETTE
DSPLICON
KELWAIT
DH,OEH
HlO_2
H3
WAIT FOR TIME OR Fl KEY
AT LAST ICON
NO THEN KEEP MOVING DISKETTE
YES THEN SHOW DISKETTE GOING IN
ROM BIOS 2-141