IBM PC CONVERTIBLE Technical Reference page 161

046A B8 90FD
MOV
AX ,90FDH SET WAIT ON DISKETTE MOTOR
0460 CD 15
INT
15H SLEEP OR DO OTHER WORK
046F 72 OE
JC
MOL08 BYPASS TIME DELAY I F TIMEOUT
TIME DELAY LOOP TO WAIT FOR MOTOR STARTUP
0471
MOL06:
0471
8A E5 MOV AH,CH MOVE TIME IN AH
0473 OA E4
OR AH,AH TEST FOR NO WAIT
0475
MOL07: TESLWAILTIME
0475 74 08
JZ MOL08 EXIT WITH TIME EXPIRED
0477 2B C9
SUB CX, CX SET UP 1/8 SECOND LOOP TIME
0479 E2 FE
LOOP
$
WAIT FOR THE REQUIRED TIME
047B FE CC
DEC AH DECREMENT TIME VALUE
0470 EB F6
JMP SHORT MOL07 ARE WE DONE YET
MOTOR IS RUNNING SO CONTINUE WITH OPERATION
047F
047F C6 06 0040 R FF
0484 B6 01
0486 F6 06 003F R OF
048B 74 90
MOL08:
MOV
MOV
TEST
JZ
MOTOR_COUNT,OFFH
DH,Ol
MOTOR_STATUS,OFH
MOLOI
SET LARGE COUNT AFTER WAIT
SET 2ND TIME THROUGH FLAG
TEST FOR MOTORS STILL ON
I F NOT OKAY THEN GO BACK AND RESTART
; MOTORS STI LL ON AFTER WAIT
0480 80 OE 003F R 20
OR MOTOR_STATUS,MOTOR_OK ; SET MOTOR ON LONG ENOUGH FLAG
0492 FB
STI ; ALLOW INTERRUPTS
0493 C3
RET
0494 MOTOR_STARTUP ENDP
; -
~
-
~
-
~
-
~
--
~
-i -;; -
K -
~
-
~
-
~
-E --
~
-
~
-
i-v -
E --P -
~
-
~
-
~
-M -E -
~
-E -R -;; --
~
-
a -u -
~
-i -
N -E
;
--
--
------
--
--------
- -- - - - - - - -
--
--
--
-----
----
--
---------
- -- - -
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----
0494
0494 E8 0586 R
0497 2B FF
0499 2B C9
049B 2B 02
0490 8E C2
049F 8A E6
04Al 3C 00
04A3 74 10
04A5 BE 0000
04A8 3C 03
04AA 74 07
04AC BE 0000
04AF 3C 01
04Bl 75 OF
04B3
04B3 2E 8E 04
04B6 2E 8B 7C 02
04BA 2E 8B 4C 04
04BE 2E 8B 54 06
04C2
04C2 89 7E 04
04C5 89 4E OA
04C8 89 46 OC
04CB 2B CO
04CD 89 46 OE
0400 8A 16 0010 R
0404 Bl 06
0406 02 EA
0408 FE C2
04DA 89 56 00
0400 C6 06 0041 R 00
04E2 C3
04E3
DSKLRDPARM PROC NEAR
CALL GELDRLCONFIG
SUB 01,01
SUB CX,CX
SUB DX,DX
MOV ES,DX
MOV AH,DH
CMP AL,NO_DRIVE
JE RDPARM_02
GET DRIVE CONFIGURATION IN AL
CLEAR REGISTERS
CLEAR ES
CLEAR AH
DRIVE PRESENT?
MOV SI,OFFSET PARMS_TPIl35 ; SET 720K DRIVE
CMP AL, TPL135
JE RDPARM_Ol
MOV SI,OFFSET PARMS_TPI48 SET 360K DRIVE
CMP AL, TPL48
JNE RDPARM_02
RDPARM_Ol :
MOV ES,CS:[SI]
MOV DI,CS: [SI+2]
MOV CX,CS: [SI+4]
MOV DX,CS: [SI+6]
RDPARM_02 :
MOV DISAVE[BP] ,01
MOV CXSAVE [BP], CX
MOV BXSAVE[BP] ,AX
SUB AX,AX
IF NOT VALID SET NO DRIVE
SETUP SEG TO DSKLPARMS
POINTER TO PARMS
TRACKS AND SECTORS
GET HEADS
MODIFY REGISTERS ON STACK
SET DRIVE TYPE IN BL
MOV AXSAVE [BP],AX ; CLEAR AL
MOV DL,BYTE PTR EQUIP_FLAG; GET LOW BYTE OF EQUIPMENT
MOV CL,6 GET
#
DISKETTES IN LOW
SHR DL, CL BITS
INC DL CORRECT FOR AT LEAST 1 DRIVE
MOV DXSAVE [BP], OX SAVE # HEADS AND # DRIVES
MOV DISKETTE_STATUS,O GET RETURN CODE
RET
DSKLRDPARM ENDP
2-136 ROM BIOS