IBM XT 5160

(AH) =2 READ THE DES I RED SECTORS I NTO MEMORY
(ES : BX ) - ADORES S OF BUFFER (NOT REQU I RED FOR VER I FY )
( AH) =3 WR I TE THE DE SI RED SECTOR S FROM MEMORY
5-23
8
9
15
9
: PARM 1 : PARM 2 :
1-1
01-10-86
DRIVE
: 320K/360K/I. 2M: 50H
: 320K/360K/l.2M: 50H
: 1.2M : 54H
: 120K : 50H
: 320K
: 360K
: 1.2M
: 120K
: MEDIA :
DISKETTE '01 /1 0/86)
( AH) = 15 READ DASD TYPE
OUTPUT REG I STERS
( AH) - ON RETURN I F CARRY FLAG NOT SET, OTHERW I SE ERROR
00 - DR I VE NOT PRESENT
o1 - 0 I SKETTE, NO CHANGE LI NE AVA I LABLE
02 - 0 I SKETTE, CHANGE LI NE AVA I LABLE
03 - RESERVED
( DL ) - DR I VE NUMBER (0 - 1 ALLOWED, VALUE CHECKED)
NOTES: - PARM I = GAP LENGTH FOR FORMAT
- PARM 2 = EOT (LAST SECTOR ON TRACK)
- DISK BASE: IS POINTED TO BY DISK POINTER LOCATED
AT ABSOLUTE ADDRESS 0 :18H.
- WHEN FORMAT OPERATIONS ARE COMPLETE, THE PARAMETERS
SHOULD BE RESTORED TO THE I R RESPECT I VE I NIT I AL VALUES.
(AH) =8 READ DR I VE PARAMETERS
REGI STERS
INPUT
( DL ) - DR I VE NUMBER (0 - 1 ALLOWED, VALUE CHECKED)
OUTPUT
(ES:DI) POINTS TO DRIVE PARAMETERS TABLE
(CH) - LOW ORDER 8 OF lOB I TS MAX I MUM NUMBER OF TRACKS
(CL) - BITS 1 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
- BITS 5 THRU 0 - MAX I MUM SECTORS PER TRACK
(DH) - MAX I MUM HEAD NUMBER
(DL) - NUMBER OF DISKETTE DRIVES INSTALLED
(BH) - 0
( BLl - BITS 1 THRU 4 - 0
BITS 3 THRU 0 - VALID DRIVE TYPE VALUE IN CMOS
(AX) - 0
UNDER THE FOLLOW I NG CIRCUMSTANCES:
( 1) THE DR I VE NUMBER I S I NV ALI 0 ,
( 2 ) THE DR I VE TYPE I S UNKNOWN AND CMOS I S NOT PRESENT,
( 3) THE DR I VE TYPE I S UNKNOWN AND CMOS I S BAD,
( 4) OR THE DR I VE TYPE I S UNKNOWN AND THE CMOS DR I VE TYPE I S I NVAL I 0
THEN ES,AX,BX,CX,DH,DI=O ; DL=NUMBER OF DRIVES.
IF NO DRIVES ARE PRESENT THEN: ES,AX,BX,CX,DX,DI=O.
ODSKETTE_STATUS = 0 AND CY I S RESET.
(AH) =4 VER I FY THE DES I RED SECTORS
(AH)=O RESET DISKETTE SYSTEM
HARD RESET TO NEC, PREPARE COMMAND, RECAL I BRA TE REQU I RED
ON ALL DR I VES
(AH)=5 FORMAT THE DESIRED TRACK
(ES:BX) MUST POINT TO THE COLLECTION OF DESIRED ADDRESS FIELDS
FOR THE TRACK. EACH FIELD IS COMPOSED OF 4 BYTES, (C,H,R,N),
WHERE C = TRACK NUMBER, H=HEAD NUMBER, R = SECTOR NUMBER,
N= NUMBER OF BYTES PER SECTOR (00= 128, 01 =256, 02=512, 03= 1 024) •
THERE MUST BE ONE ENTRY FOR EVERY SECTOR ON THE TRACK.
THIS INFORMATION IS USED TO FIND THE REQUESTED SECTOR DURING
READ/WRITE ACCESS.
PR I OR TO FORMA TTl NG A 0 I SKETTE , I F THERE EX 1STS MORE THAN
ONE 'SUPPORTED MEDIA FORMAT TYPE WITHIN THE DRIVE IN QUESTION,
THEN "SET DASD TYPE" (INT 13H, AH = 11H) OR "SET MEDIA TYPE"
( I NT 1 3H, AH = 1 8H) MUST BE CALLED TO SET THE 0 I SKETTE TYPE
THAT IS TO BE FORMATED. IF "SET DASD TYPE" OR "SET MEDIA TYPE"
I S NOT CALLED, THE FORMAT ROUT I NE WILL ASSUME THE MED I A FORMAT
TO BE THE MAX I MUM CAPAC I TY OF THE DR I VE.
THESE PARAMETERS OF 0 I SK BASE MUST BE CHANGED I N ORDER TO
FORMAT THE FOLLOWING MEDIAS:
(AH)=1 READ THE STATUS OF THE SYSTEM INTO (AH)
ODISKETTE_STATUS FROM LAST OPERATION IS USED
; -- ---- -~~~~~~~~~ - ;~~ - ~~~~ I;~~ ~~I ~~~ ~;; I;~~~~~ ----------- --- ------- -- -- -- -- ----
; ( DLl - DR I VE NUMBER (0 - 1 ALLOWED, VALUE CHECKED)
; ( DH ) - HEAD NUMBER (0 - 1 ALLOWED, NOT VALUE CHECKED)
; ( CH) - TRACK NUMBER (NOT VALUE CHECKED)
; MED I A DR I VE TRACK NUMBER
; 320/360 320/360 0-39
; 320/360 1.2M 0-39
; 1.2M 1.2M 0-19
• 120K 120K 0-19
( CL ) - SECTOR NUMBER (NOT VALUE CHECKED, NOT USED FOR FORMAT)
MED I A DR I VE SECTOR NUMBER
320/360 320/360 1-8/9
320/360 1.2M 1-8/9
1 .2M 1 .2M 1- 15
120K 120K 1-9
(ALl - NUMBER OF SECTORS (NOT VALUE CHECKED)
MED I A DR I VE MAX NUMBER OF SECTORS
320/360 320/360 8/9
320/360 1.2M 8/9
1.2M 1.2M 15
120K 120K 9
PAGE 1 18, 121
TITLE DSKETTE - - 0 I I 1 0/86 0 I SKETTE ADAPTER B I OS
.LIST
; -- I NT 13 -------------------------------------------------------------------
DISKETTE 1/0
THIS INTERFACE PROVIDES DISK ACCESS TO THE 5.25 INCH 360 KB,
; INPUT 1.2MB, AND 120 KB 80 TRACK 0 I SKETTE DR I VES.
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I BM Persona I Computer MACRO Assemb I er Vers i on 2.00
DSKETTE - - 0 1 11 0/86 0 I SKETTE ADAPTER B I OS