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SAU | | 1 IBM BIOS QUICK REFERENCE SUMMARY | 2 | by DAVID E. POWELL | | All values are in hex | ┌─────────────────────────────┐ | | │ INT 09 - KEYBOARD INTERRUPT │ | ┌────────────────┐ | └─────────────────────────────┘ | │ BIOS DATA AREA │ | | └────────────────┘ | INPUT PARAMETERS: NONE | | OUTPUT PARAMETERS: NONE | ADDR. SIZE DESCRIPTION | MEMORY: | | | 40:00 WORD COM1 PORT ADDRESS | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | 40:02 WORD COM2 PORT ADDRESS | │7│6│5│4│3│2│1│0│ 40:17 | 40:04 WORD COM3 PORT ADDRESS | └─┴─┴─┴─┴─┴─┴─┴─┘ | 40:06 WORD COM4 PORT ADDRESS | │ │ │ │ │ │ │ │ | 40:08 WORD LPT1 PORT ADDRESS | │ │ │ │ │ │ │ └───── RIGHT SHIFT KEY DEPRESSED | 40:0A WORD LPT2 PORT ADDRESS | │ │ │ │ │ │ └─────── LEFT SHIFT KEY DEPRESSED | 40:0C WORD LPT3 PORT ADDRESS | │ │ │ │ │ └───────── CONTROL SHIFT KEY DEPRESSED | 40:0E WORD LPT4 PORT ADDRESS | │ │ │ │ └─────────── ALTERNATE SHIFT KEY DEPRESSED | 40:10 WORD EQUIPMENT FLAG (SEE INT 11) | │ │ │ └───────────── SCROLL LOCK STATE HAS BEEN TOGGLED| 40:13 WORD MEMORY SIZE IN KBYTES | │ │ └─────────────── NUM LOCK STATE HAS BEEN TOGGLED | 40:17 BYTE KEYBOARD FLAG BYTE 0 (SEE INT 9) | │ └───────────────── CAPS LOCK STATE HAS BEEN TOGGLED | 40:18 BYTE KEYBOARD FLAG BYTE 1 (SEE INT 9) | └─────────────────── INSERT STATE IS ACTIVE | 40:19 BYTE STORAGE FOR ALTERNATE KEYPAD ENTRY | | 40:1A WORD POINTER TO KEYBOARD BUFFER HEAD | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | 40:1C WORD POINTER TO KEYBOARD BUFFER TAIL | │7│6│5│4│3│2│1│0│ 40:18 | 40:1E 20BYTES KEYBOARD BUFFER | └─┴─┴─┴─┴─┴─┴─┴─┘ | 40:3E BYTE DRIVE RECALIBRATION STATUS | │ │ │ │ │ │ │ │ | 40:3F BYTE MOTOR STATUS | │ │ │ │ │ │ │ └───── LEFT CONTROL KEY DEPRESSED | 40:3E BYTE DRIVE RECALIBRATION STATUS | │ │ │ │ │ │ └─────── LEFT ALT SHIFT KEY DEPRESSED | 40:3F BYTE MOTOR STATUS | │ │ │ │ │ └───────── SYSTEM KEY DEPRESSED AND HELD | 40:40 BYTE MOTOR OFF COUNTER (DECR. BY TIMER) | │ │ │ │ └─────────── SUSPEND KEY HAS BEEN TOGGLED | 40:41 BYTE STATUS OF LAST DISKETTE OPERATION | │ │ │ └───────────── SCROLL LOCK KEY IS DEPRESSED | 40:42 7 BYTES NEC STATUS | │ │ └─────────────── NUM LOCK KEY IS DEPRESSED | 40:49 BYTE CURRENT CRT MODE | │ └───────────────── CAPS LOCK KEY IS DEPRESSED | 40:4A WORD NUMBER OF COLUMNS ON SCREEN | └─────────────────── INSERT KEY IS DEPRESSED | 40:4C WORD REGEN BUFFER LENGTH IN BYTES | | 40:4E WORD STARTING OFFSET OF REGEN BUFFER | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | 40:50 8 WORDS CURSOR POSITION PAGES 1-8 | │7│6│5│4│3│2│1│0│ 40:96 | 40:60 BYTE END LINE FOR CURSOR | └─┴─┴─┴─┴─┴─┴─┴─┘ | 40:61 BYTE START LINE FOR CURSOR | │ │ │ │ │ │ │ │ | 40:62 BYTE CURRENT PAGE BEING DISPLAYED | │ │ │ │ │ │ │ └───── LAST CODE WAS THE E1 HIDDEN CODE | 40:63 WORD BASE PORT ADDRESS FOR ACTIVE DISPLAY | │ │ │ │ │ │ └─────── LAST CODE WAS THE E0 HIDDEN CODE | 40:65 BYTE CURRENT SETTING OF THE 3X8 REGISTER | │ │ │ │ │ └───────── RIGHT CTL KEY DOWN | 40:66 BYTE CURRENT PALETTE SETTING COLOR CARD | │ │ │ │ ├─────────── RIGHT ALT KEY DOWN | 40:67 DWORD TEMP. STORAGE FOR SS:SP DURING SHUTDOWN | │ │ │ │ └─────────── ALT GRAPHICS KEY DOWN (WT ONLY) | 40:6C DWORD TIMER COUNTER LOW WORD, HIGH WORD | │ │ │ └───────────── ENHANCED KEYBOARD INSTALLED | 40:70 BYTE 24 HOUR TIMER OVERFLOW | │ │ └─────────────── FORCE NUM LOCK IF RD ID & KBX | 40:71 BYTE BIOS BREAK FLAG (BIT 7 = BREAK KEY HIT) | │ └───────────────── LAST CHAR WAS FIRST ID CHAR | 40:72 WORD RESET FLAG (1234 = SOFT RESET) | └─────────────────── DOING A READ ID (MUST BE BIT0) | 40:74 BYTE STATUS OF LAST HARD DISK OPERATION | | 40:75 BYTE NUMBER OF HARD FILES ATTACHED | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | 40:77 BYTE PORT OFFSET TO CURRENT HF ADAPTER | │7│6│5│4│3│2│1│0│ 40:97 | 40:78 4 BYTES TIMEOUT VALUE FOR LPT1,LPT2,LPT3,LPT4 | └─┴─┴─┴─┴─┴─┴─┴─┘ | 40:7C 4 BYTES TIMEOUT VALUE FOR COM1,COM2,COM3,COM4 | │ │ │ │ │ │ │ │ | 40:80 WORD KEYBOARD BUFFER START OFFSET (SEG=40) | │ │ │ │ │ │ │ └───── SCROLL LOCK INDICATOR | 40:82 WORD KEYBOARD BUFFER END OFFSET (SEG=40H) | │ │ │ │ │ │ └─────── NUM LOCK INDICATOR | 40:84 BYTE ROWS ON THE SCREEN (EGA ONLY) | │ │ │ │ │ └───────── CAPS LOCK INDICATOR | 40:85 WORD BYTES PER CHARACTER (EGA ONLY) | │ │ │ │ └─────────── CIRCUS SYSTEM INDICATOR | 40:87 BYTE MODE OPTIONS (EGA ONLY) | │ │ │ └───────────── ACK RECEIVED | 40:88 BYTE FEATURE BIT SWITCHES (EGA ONLY) | │ │ └─────────────── RESEND RECEIVED FLAG | 40:8B BYTE LAST DISKETTE DATA RATE SELECTED | │ └───────────────── MODE INDICATOR UPDATE | 40:8C BYTE HARD FILE STATUS RETURNED BY CONTROLLER | └─────────────────── KEYBOARD TRANSMIT ERROR FLAG | 40:8D BYTE HARD FILE ERROR RETURNED BY CONTROLLER | | 40:8E BYTE HARD FILE INTERRUPT (BIT 7=WORKING INT) | | 40:90 4 BYTES MEDIA STATE DRIVE 0,1,2,3 | 40:1E = KEYBOARD BUFFER (20H BYTES) | 40:94 2 BYTES TRACK CURRENTLY SEEKED TO DRIVE 0,1 | 40:1C = BUFFER TAIL POINTER | 40:96 BYTE KEYBOARD FLAG BYTE 3 (SEE INT 9) | 40:72 = 1234H IF CTL-ALT-DEL PRESSED ON KEYBOARD | 40:97 BYTE KEYBOARD FLAG BYTE 2 (SEE INT 9) | INT 05 INVOKED IF PRINT SCREEN KEY PRESSED. | 40:98 DWORD POINTER TO USERS WAIT FLAG | INT 1B INVOKED IF CTL-BREAK KEY SEQUENCE PRESSED. | 40:9C DWORD USERS TIMEOUT VALUE IN MICROSECONDS | INT 15, AH=85 INVOKED ON PC/AT AND AFTER IF SYSTEM | 40:A0 BYTE RTC WAIT FUNCTION IN USE | REQUEST KEY IS PRESSED. | 40:A1 BYTE LANA DMA CHANNEL FLAGS | INT 15, AH=4F INVOKED ON MACHINES AFTER PC/AT WITH | 40:A2 2 BYTES STATUS LANA 0,1 | AL = SCAN CODE | 40:A4 DWORD SAVED HARDFILE INTERRUPT VECTOR | | 40:A8 DWORD EGA POINTER TO PARAMETER TABLE | ┌─────────────────────┐ | 40:B4 BYTE KEYBOARD NMI CONTROL FLAGS (CONVERTIBLE) | │ INT 10 - VIDEO BIOS │ | 40:B5 DWORD KEYBOARD BREAK PENDING FLAGS (CONVERTIBLE)| └─────────────────────┘ | 40:B9 BYTE PORT 60 SINGLE BYTE QUEUE (CONVERTIBLE) | | 40:BA BYTE SCAN CODE OF LAST KEY (CONVERTIBLE) | INPUT PARAMETERS: | 40:BB BYTE POINTER TO NMI BUFFER HEAD (CONVERTIBLE) | | 40:BC BYTE POINTER TO NMI BUFFER TAIL (CONVERTIBLE) | AH = 00 - SET VIDEO MODE | 40:BD 16BYTES NMI SCAN CODE BUFFER (CONVERTIBLE) | | 40:CE WORD DAY COUNTER (CONVERTIBLE AND AFTER) | AL = 00 - 40x25 ALPHANUMERIC B/W | 50:00 BYTE PRINT SCREEN STATUS BYTE | = 01 - 40x25 ALPHANUMERIC COLOR | | = 02 - 80x25 ALPHANUMERIC B/W | ┌───────────────────────┐ | = 03 - 80x25 ALPHANUMERIC COLOR | │ INT 05 - PRINT SCREEN │ | = 04 - 320x200 COLOR GRAPHICS | └───────────────────────┘ | = 05 - 320x200 B/W GRAPHICS | | = 06 - 640x200 B/W GRAPHICS | | = 07 - 80x25 MONOCHROME ALPHA | INPUT PARAMETERS: NONE | = 08 - 160x200 COLOR GRAPHICS (PCJR) | OUTPUT PARAMETERS: NONE | = 09 - 320x200 COLOR GRAPHICS (PCJR) | MEMORY: | = 0A - 640x200 COLOR GRAPHICS (PCJR) | | = 0D - 320x200 MONOCHROME GRAPHICS (EGA +) | 50:0 = 00 - PRINT SCREEN HAS NOT BEEN CALLED, OR | = 0E - 640x200 MONOCHROME GRAPHICS (EGA +) | UPON RETURN FROM A CALL THERE WERE NO | = 0F - 640x350 MONOCHROME GRAPHICS (EGA +) | ERRORS. | = 10 - 640x350 MONOCHROME HI-RES (EGA +) | | | = 01 - PRINT SCREEN IS ALREADY IN PROGRESS. | AH = 01 - SET CURSOR TYPE | | | = FF - ERROR ENCOUNTERED DURING PRINTING. | CH = TOP LINE FOR CURSOR (BITS 4-0) | | CL = BOTTOM LINE FOR CURSOR (BITS 4-0) | | | ┌───────────────────────┐ | AH = 02 - SET CURSOR POSITION | │ INT 08 - SYSTEM TIMER │ | | └───────────────────────┘ | DH = ROW | | DL = COLUMN | INPUT PARAMETERS: NONE | BH = PAGE NUMBER (0 FOR GRAPHICS MODES) | OUTPUT PARAMETERS: NONE | | MEMORY: | AH = 03 - READ CURSOR POSITION | | ON EXIT: | 40:6C = NUMBER OF INTERRUPTS SINCE POWER ON (4 BYTES) | DH = ROW # | 40:70 = NUMBER OF DAYS SINCE POWER ON (1 BYTE) | DL = COLUMN # | 40:67 = DAY COUNTER ON ALL PRODUCTS AFTER PC/AT | CH = TOP LINE FOR CURSOR (BITS 4-0) | 40:40 = MOTOR CONTROL COUNT - GETS DECREMENTED | CL = BOTTOM LINE FOR CURSOR (BITS 4-0) | AND SHUTS OFF DISKETTE MOTOR IF ZERO | | | | INT 1C INVOKED AS A USER INTERRUPT. | CONTINUED ON NEXT PANEL | | | | | 3 | 4 | INT 10 - VIDEO BIOS (CONTINUED) | INT 10 - VIDEO BIOS AH = 11 (CONTINUED) | | | AH = 04 - READ LIGHT PEN POSITION | AL = 02 - ROM 8X8 DOUBLE DOT | ON EXIT: AH = 0 IF LIGHT PEN SWITCH IS NOT TRIGGERED | BL = BLOCK TO LOAD | AH = 1 IF REGISTERS HAVE VALID VALUES | | DH = ROW | AL = 03 - SET BLOCK SPECIFIER | DL = COLUMN | BL = CHARACTER GEN BLOCK SPECIFIER | CH = RASTER LINE (0-199) | | CX = RASTER LINE ON NEW GRAPHICS MODES | AL = 10 - USER ALPHA LOAD | BX = PIXEL COLUMN (0-319,639) | ES:BP = POINTER TO USER TABLE | | CX = COUNT TO STORE | AH = 05 - SELECT ACTIVE DISPLAY PAGE | DX = CHARACTER OFFSET INTO TABLE | AL = NEW PAGE INFO, SEE AH=0 FOR PAGE INFO | BH = NUMBER OF BYTES PER CHARACTER | FOR PCjr ONLY: | BL = BLOCK TO LOAD | AL = 80 TO READ CRT/CPU PAGE REGISTERS | | = 81 TO SET CPU PAGE REGISTER | AL = 11 - ROM MONOCHROME SET | BL = CPU PAGE REGISTER | BL = BLOCK TO LOAD | = 82 TO SET CRT PAGE REGISTER | | BH = CRT PAGE REGISTER | AL = 12 - ROM 8X8 DOUBLE DOT | = 83 TO SET CPU AND PAGE REGISTERS | BL = BLOCK TO LOAD | BH = CRT PAGE REGISTER | | BL = CPU PAGE REGISTER | AL = 20 - USER GRAPHICS CHARS INT 01FH (8X8) | ON EXIT: | ES:BP = POINTER TO USER TABLE | BH = CRT PAGE REGISTER | | BL = CPU PAGE REGISTER | AL = 21 - USER GRAPHICS CHARS | | ES:BP = POINTER TO USER TABLE | AH = 06 - SCROLL ACTIVE PAGE UP | CX = BYTES PER CHARACTER | AL = NUMBER OF LINES, INPUT LINES BLANKED | BL = ROW SPECIFIER | CX = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL | BL = 0 - USER SPECIFIED | DX = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL| DL = ROWS | BH = ATTRIBUTE TO BE USED ON BLANK LINE | BL = 1 - 0E ROWS | | BL = 2 - 19 ROWS | AH = 07 - SCROLL ACTIVE PAGE DOWN | BL = 3 - 2B ROWS | AL = NUMBER OF LINES, INPUT LINES BLANKED | | CX = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL | AL = 22 - ROM 8X14 SET | DX = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL| BL = ROW SPECIFIER | BH = ATTRIBUTE TO BE USED ON BLANK LINE | | | AL = 23 - ROM 8X8 DOUBLE DOT | AH = 08 - READ ATTRIBUTE/CHARACTER AT CURSOR POSITION | BL = ROW SPECIFIER | BH = DISPLAY PAGE | | ON EXIT: | AL = 30 - RETURN INFORMATION | AL = CHARACTER AT CURRENT CURSOR POSITION | ES:BP = POINTER TO TABLE | AH = ATTRIBUTE OF CHARACTER (ALPHA MODES ONLY) | DL = ROWS | | CX = POINTS | AH = 09 - WRITE ATTRIBUTE/CHARACTER AT CURSOR POSITION | BH = INFORMATION DESIRED: | BH = DISPLAY PAGE | = 0 - INT 1F POINTER | CX = COUNT OF CHARACTERS TO WRITE | = 1 - INT 44 POINTER | AL = CHARACTER TO WRITE | = 2 - ROM 8X14 POINTER | BL = ATTRIBUTE/COLOR OF CHARACTER. IF | = 3 - ROM DOUBLE DOT POINTER | BIT 7=1 IN GRAPHICS MODE THEN XOR | = 4 - ROM DOUBLE DOT POINTER (TOP)| THE COLOR VALUE WITH ITS CURRENT VALUE | = 5 - ROM ALPHA ALTERNATE 9X14 | | | AH = 0A - WRITE CHARACTER ONLY AT CURRENT CURSOR POSITION| AH = 12 - ALTERNATE SELECT (EGA AND AFTER) | BH = DISPLAY PAGE | | CX = COUNT OF CHARACTERS TO WRITE | BL = 10 - RETURN EGA INFORMATION | AL = CHARACTER TO WRITE | ON EXIT: BH = 0 IF COLOR MODE IS IN EFFECT | NOTE: SHOULD NOT BE USED IN GRAPHICS MODES | = 1 IF MONO MODE IS IN EFFECT | | BL = 0 IF 64K EGA MEMORY | AH = 0B - SET COLOR PALETTE | = 0 IF 128K EGA MEMORY | BH = 0 FOR BACKGROUND, =1 FOR FOREGROUND | = 0 IF 192K EGA MEMORY | BL = COLOR VALUE | = 0 IF 256K EGA MEMORY | | CH = FEATURE BITS | AH = 0C - WRITE DOT | CL = SWITCH SETTINGS | BH = PAGE NUMBER | | DX = ROW NUMBER | BL = 20 - SELECT ALTERNATE PRINT SCREEN ROUTINE| CX = COLUMN NUMBER | | AL = COLOR VALUE (XOR'D IF BIT 7=1) | AH = 13 - WRITE STRING (EGA AND AFTER) | | | AH = 0D - READ DOT | ES:BP = STRING TO BE WRITTEN | BH = PAGE NUMBER | CX = CHARACTER ONLY COUNT | DX = ROW NUMBER | DX = POSITION TO BEGIN STRING, IN CURSOR TERMS | CX = COLUMN NUMBER | BH = PAGE NUMBER | AL = DOT READ UPON RETURN | BL = ATTRIBUTE IF AL BIT 1=0 | | AL = TYPE OF WRITE: | AH = 0E - WRITE TELETYPE TO ACTIVE PAGE | | AL = CHARACTER TO WRITE | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | BL = FOREGROUND COLOR IN GRAPHICS MODE | │7│6│5│4│3│2│1│0│ AL | BH = PAGE NUMBER | └─┴─┴─┴─┴─┴─┴─┴─┘ | | │ │ │ │ │ │ │ │ | AH = 0F - RETURN CURRENT VIDEO STATE | │ │ │ │ │ │ │ └───── MOVE CURSOR | ON EXIT: AL = MODE CURRENTLY SET (SEE AH=0) | │ │ │ │ │ │ └─────── STRING HAS ATTRIBUTES | AH = NUMBER OF CHARACTER COLUMNS ON SCREEN | └─┴─┴─┴─┴─┴───────── NOT USED | BH = CURRENT ACTIVE DISPLAY PAGE | | | AH = 14 - LOAD LCD CHAR FONT (CONVERTIBLE ONLY) | AH = 10 - SET/GET PALETTE REGISTERS (EGA AND AFTER) | | | AL = 0 - LOAD USER SPECIFIED FONT | AL = 00 - SET INDIVIDUAL PALETTE REGISTER | ES:DI = POINTER TO CHARACTER FONT | BH = VALUE TO SET | CX = NUMBER OF CHARACTERS TO STORE | BL = PALETTE REGISTER TO BE SET | DX = CHAR OFFSET INTO RAM FONT AREA | | BH = NUMBER OF BYTES PER CHARACTER | AL = 01 - SET OVERSCAN REGISTER | BL = 0 - LOAD MAIN FONT (BLOCK 0) | BH = VALUE TO SET | = 1 - LOAD ALTERNATE FONT (BLOCK 1)| | | AL = 02 - SET ALL PALETTE REGS AND OVERSCAN | AL = 1 - LOAD SYSTEM ROM DEFAULT FONT | ES:DX = POINTER TO 16-BYTE TABLE | BL = 0 - LOAD MAIN FONT (BLOCK 0) | OF REGISTER VALUES FOLLOWED | = 1 - LOAD ALTERNATE FONT (BLOCK 1)| BY THE OVERSCAN VALUE | | | AL = 2 - SET MAPPING OF LCD HIGH INT. ATTR. | AL = 03 - TOGGLE THE INTENSIFY/BLINKING BIT | BL = 0 - IGNORE HIGH INTENSITY ATTR. | BL = 0 - ENABLE INTENSIFY | = 1 - MAP HIGH INT. TO UNDERSCORE | BL = 1 - ENABLE BLINKING | = 2 - MAP HIGH INT. TO REVERSE VID.| | = 3 - MAP HI INT. TO SEL. ALT FONT | AH = 11 - CHARACTER GENERATOR ROUTINE (EGA AND AFTER) | | | AH = 15 - RETURN PHYSICAL DISPLAY PARMS (CONVERTIBLE) | AL = 00 - USER ALPHA LOAD | ON EXIT: | ES:BP = POINTER TO USER TABLE | AX = ALTERNATD DISPLAY ADAPTER TYPE | CX = COUNT TO STORE | ES:DI = POINTER TO PARAMETER TABLE: | DX = CHARACTER OFFSET INTO TABLE | WORD # INFORMATION | BL = BLOCK TO LOAD | 1 MONITOR MODEL NUMBER | BH = NUMBER OF BYTES PER CHARACTER | 2 VERTICAL PELS PER METER | | 3 HORIZONTAL PELS PER METER | AL = 01 - ROM MONOCHROME SET | 4 TOTAL NUMBER OF VERTICAL PELS | BL = BLOCK TO LOAD | 5 TOTAL NUMBER OF HORIZONTAL PELS | | 6 HORIZ. PEL SEPERATION IN MICROMETERS| | 7 VERT. PEL SEPERATION IN MICROMETERS | | | | | CONTINUED ON NEXT PANEL | | | | 5 | 6 INT 13 - DISKETTE BIOS (CONTINUED) | ┌──────────────────────────────────┐ | | │ INT 11 - EQUIPMENT DETERMINATION │ | DISKETTE STATUS DEFINITIONS | └──────────────────────────────────┘ | | | 80 = TIME OUT │ 08 = DMA FAILURE | INPUT PARAMETERS: NONE | 40 = SEEK FAILURE │ 06 = MEDIA CHANGE | OUTPUT PARAMETERS: | 20 = NEC CONTROLLER FAILURE │ 04 = SECTOR NOT FOUND | | 10 = CRC ERROR │ 03 = WRITE PROTECTED | ┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ | 0C = UNSUPPORTED TRACK │ 02 = BAD ADDRESS MARK | │F│E│D│C│B│A│9│8│7│6│5│4│3│2│1│0│ AX | 09 = DMA BOUNDARY ERROR │ 01 = INVALID FUNCTION | └─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘ | | │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ | CY = 1 IF STATUS PRESENTED IS NOT ZERO | │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ └─ IPL DISKETTE INSTALLED | | │ │ │ │ │ │ │ │ │ │ │ │ │ │ └─── MATH COPROCESSOR | ┌──────────────────────────┐ | │ │ │ │ │ │ │ │ │ │ │ │ │ └───── NOT USED | │ INT 13 - FIXED DISK BIOS │ | │ │ │ │ │ │ │ │ │ │ │ │ └─────── NOT USED | └──────────────────────────┘ | │ │ │ │ │ │ │ │ │ │ └─┴───────── INITIAL VIDEO MODE | | │ │ │ │ │ │ │ │ └─┴───────────── # OF DISKETTE DRIVES | UNLESS OTHERWISE NOTED, ALL FIXED DISK INTERRUPT | │ │ │ │ │ │ │ └───────────────── NOT USED | CALLS FUNCTION AS FOLLOWS: | │ │ │ │ └─┴─┴─────────────────── NUMBER OF RS232 CARDS | INPUT PARAMETERS: | │ │ │ └───────────────────────── NOT USED | AH = FUNCTION REQUEST NUMBER | │ │ └─────────────────────────── INT. MODEM INSTALLED | AL = NUMBER OF SECTORS | └─┴───────────────────────────── NUMBER OF PRINTERS | BX = ADDRESS OF USER BUFFER (ES = SEGMENT) | | CH = CYLINDER NUMBER | NOTE: INITIAL VIDEO MODE (BITS 4 & 5) | (BITS 9,A = BITS 7,8 OF CL) | 00 - UNUSED 01 - 40x25 COLOR CARD | CL = SECTOR NUMBER | 10 - 80x25 COLOR CARD 11 - 80x25 MONOCHROME CARD | DH = HEAD NUMBER | | DL = DRIVE NUMBER, BIT 7=1 | | OUTPUT PARAMETERS: | | AH = STATUS OF OPERATION: | ┌────────────────────────────────┐ | | │ INT 12 - MEMORY SIZE DETERMINE │ | BB = UNDEFINED ERROR │ 09 = DMA BOUNDARY ERROR | └────────────────────────────────┘ | AA = DRIVE NOT READY │ 08 = DMA FAILURE | | 80 = TIME OUT │ 07 = PARAMETER ACT. FAIL | INPUT PARAMETERS: NONE | 40 = SEEK FAILURE │ 05 = RESET FAILED | OUTPUT PARAMETERS: | 20 = CONTROLLER FAILURE │ 04 = SECTOR NOT FOUND | | 11 = DATA ECC CORRECTED │ 03 = WRITE PROTECT ERROR | AX = NUMBER OF CONTIGUOUS 1K BLOCKS OF MEMORY | 10 = BAD ECC ON DISK READ│ 02 = BAD ADDRESS MARK | | 0B = BAD TRACK DETECTED │ 01 = INVALID FUNCTION REQ. | MEMORY: NONE | 0A = BAD SECTOR DETECTED │ 00 = NO ERROR | | | | CY = 1 IF STATUS NOT ZERO | ┌────────────────────────┐ | | │ INT 13 - DISKETTE BIOS │ | | └────────────────────────┘ | AH = 00 - RESET FIXED DISK SYSTEM | | | INPUT PARAMETERS: | AH = 01 - READ STATUS OF LAST OPERATION | | ON EXIT: AL = STATUS OF LAST OPERATION | AH = 00 - RESET DISKETTE SYSTEM | | ON EXIT: AH = STATUS | AH = 02 - READ THE DESIRED SECTORS INTO MEMORY | | | AH = 01 - READ STATUS OF LAST OPERATION | AH = 03 - WRITE THE DESIRED SECTORS FROM MEMORY | ON EXIT: AH = STATUS | | | AH = 04 - VERIFY THE DESIRED SECTORS | AH = 02 - READ THE DESIRED SECTORS INTO MEMORY | | AL = NUMBER OF SECTORS | AH = 05 - FORMAT THE DESIRED TRACK | BX = ADDRESS OF BUFFER (ES=SEGMENT) | AL = INTERLEAVE VALUE (XT ONLY) | CH = TRACK NUMBER | | CL = SECTOR NUMBER | BX = FORMAT BUFFER, SIZE = 512 BYTES | DH = HEAD NUMBER | THE FIRST 2*(SECTORS/TRACK) BYTES | DL = DRIVE NUMBER (BIT 7=0) | CONTAIN F,N FOR EACH SECTOR. | ON EXIT: | F=00 FOR GOOD SECTOR, 80 FOR BAD SECTOR | AL = NUMBER OF SECTORS TRANSFERRED | N=SECTOR NUMBER | AH = STATUS | | | AH = 06 - FORMAT TRACK AND SET BAD SECTOR FLAGS | AH = 03 - WRITE THE DESIRES SECTORS FROM MEMORY | (VALID FOR XT AND PORTABLE ONLY) | AL,BX,CX,DX SAME AS AH=02 | AL = INTERLEAVE VALUE (XT ONLY) | | BX = FORMAT BUFFER, SIZE = 512 BYTES | AH = 04 - VERIFY THE DESIRED SECTORS | THE FIRST 2*(SECTORS/TRACK) BYTES | AL,BX,CX,DX SAME AS AH=02 | CONTAIN F,N FOR EACH SECTOR. | | F=00 FOR GOOD SECTOR, 80 FOR BAD SECTOR | AH = 05 - FORMAT THE DESIRED TRACK | N=SECTOR NUMBER | AL,BX,CX,DX SAME AS AH=02 | | BUFFER CONTAINS ADDRESS FIELDS OF THE | AH = 07 - FORMAT THE DRIVE STARTING AT THE DESIRED TRACK| FORM C,H,R,N FOR EACH SECTOR FORMATTED | (VALID FOR XT AND PORTABLE ONLY) | | AL = INTERLEAVE VALUE (XT ONLY) | AH = 06 - RESERVED FOR FIXED DISK | BX = FORMAT BUFFER, SIZE = 512 BYTES | | THE FIRST 2*(SECTORS/TRACK) BYTES | AH = 07 - RESERVED FOR FIXED DISK | CONTAIN F,N FOR EACH SECTOR. | | F=00 FOR GOOD SECTOR, 80 FOR BAD SECTOR | AH = 08 - READ DRIVE PARAMETERS | N=SECTOR NUMBER | ON EXIT: AH = STATUS OF OPERATION | | | AH = 08 - READ DRIVE PARAMETERS | AH = 15 - READ DASD TYPE | ON EXIT: | DL = DRIVE NUMBER | DL = NUMBER OF CONSECUTIVE ACKNOWLEDGING DRIVES | ON EXIT: | DH = MAXIMUM USABLE VALUE FOR HEAD NUMBER | AH = 00 IF DRIVE NOT PRESENT | CH = MAXIMUM USEABLE VALUE FOR CYLINDER NUMBER | = 01 IF DISKETTE WITHOUT CHANGE LINE | CL = MAXIMUM USEABLE VALUE FOR SECTOR NUMBER | = 02 IF DISKETTE WITH CHANGE LINE | AND CYLINDER NUMBER HIGH BITS | | | AH = 16 - DISK CHANGE LINE STATUS | AH = 09 - INITIALIZE DRIVE PAIR CHARACTERISTICS | DL = DRIVE NUMBER | | ON EXIT: | INT 41 POINTS TO DATA BLOCK FOR DRIVE 80 | AH = STATUS OF OPERATION | INT 46 POINTS TO DATA BLOCK FOR DRIVE 81 | | | AH = 17 - SET DASD TYPE FOR FORMAT | DATA BLOCK DEFINITIONS: | DL = DRIVE NUMBER | +0 = MAXIMUM NUMBER OF CYLINDERS (DW) | AL = 01 - 360KB DISKETTE IN 360KB DRIVE | +2 = MAXIMUM NUMBER OF HEADS (DB) | = 02 - 360KB DISKETTE IN 1.2M DRIVE | +3 = STARTING REDUCED WRITE CURRENT CYLINDER | = 03 - 1.2M DISKETTE IN 1.2M DRIVE | (DW - XT ONLY) | = 04 - 720KB DISKETTE IN 720KB DRIVE | +5 = STARTING WRITE PRECOMP CYLINDER (DW) | ON EXIT: | +7 = MAXIMUM ECC DATA BURST LENGTH (DB - XT ONLY) | AH = STATUS OF OPERATION | +8 = CONTROL BYTE: | | ┌─┬─┬─┬─┬─┬─┬─┬─┐ | AH = 18 - SET MEDIA TYPE FOR FORMAT | │7│6│5│4│3│2│1│0│ | DL = DRIVE NUMBER | └─┴─┴─┴─┴─┴─┴─┴─┘ | CH = LOWER 8 BITS OF NUMBER OF TRACKS | │ │ │ │ │ │ │ │ | CL = HIGH 2 BITS OF NUMBER OF TRACKS (6,7) | │ │ │ │ │ └─┴─┴───── DRIVE OPTION | = SECTORS PER TRACK (BITS 0-5) | │ │ └─┴─┴─────────── ALWAYS ZERO | ON EXIT: | │ └───────────────── DISABLE ECC RETRIES | ES:DI = POINTER TO 11-BYTE PARM TABLE | └─────────────────── DISABLE ACCESS RETIRES | AH = 00 IF REQUESTED COMBINATION SUPPORTED | | = 01 IF FUNCTION NOT AVAILABLE | | = 0C IF NOT SUPP. OR DRIVE TYPE UNKNOWN | | = 80 IF THERE IS NO MEDIA IN THE DRIVE | | | | | CONTINUED ON NEXT PANEL | CONTINUED ON NEXT PANEL | | | |