271 lines
14 KiB
Plaintext
271 lines
14 KiB
Plaintext
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I B M P C B I O S S e r v i c e R o u t i n e s
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Adapted from IBM Technical Reference Release 11/08/82
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by Roy Smith
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----------------------------------------------------------------------------
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Vector Interrupt BIOS Entry
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Address Number Name label
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----------------------------------------------------------------------------
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00-03 0 Divide by Zero D11
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04-07 1 Single Step D11
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08-0B 2 Nonmaskable NMI_INT
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0C-0F 3 Breakpoint D11
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10-13 4 Overflow D11
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14-17 5 Print Screen PRINT_SCREEN
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18-1B 6 Reserved D11
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1C-1F 7 Reserved D11
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---- Hardware Service Routines ---------------------------------------------
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20-23 8 Time of Day Service TIMER_INT
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24-27 9 Keyboard Service KB_INT
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28-2B A Reserved D11
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2C-2F B Communications Service COM2: D11
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30-33 C Communications Service COM1: D11
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34-37 D Disk Service D11
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38-3B E Diskette Service DISK_INT
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3C-3F F Printer Service D11
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----------------------------------------------------------------------------
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40-43 10 Video I/O VIDEO_IO
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44-47 11 Equipment Check EQUIPMENT
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48-4B 12 Memory MEMORY_SIZE_DETERMINE
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4C-4F 13 Diskette/Disk I/O DISKETTE_IO
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50-53 14 Communications RS232_IO
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54-57 15 Cassette CASSETTE_IO
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58-5B 16 Keyboard I/O KEYBOARD_IO
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5C-5F 17 Printer PRINTER_IO
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60-63 18 Resident BASIC F600:0000
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64-67 19 Bootstrap BOOT_STRAP
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68-6B 1A Time of Day TIME_OF_DAY
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6C-6F 1B Keyboard Break DUMMY_RETURN
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70-73 1C Timer Tick (18.2 per second) DUMMY_RETURN
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74-77 1D Video Initialization VIDEO_PARMS
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78-7B 1E Diskette Operating Parameters DISK_BASE
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7C-7F 1F Video Graphics Characters 0
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+--------------------------------------------------------------------------+
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| I B M P C B I O S I n t e r f a c e R o u t i n e s |
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+--------------------------------------------------------------------------+
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Intr Func In Out Comments
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# (AH) Regs Regs
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10 --------------- Video I/O ---------------------------------------------
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--- 0 Set CRT Mode
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AL 0=40 x 25 Black & white 1= 40 x 25 Color
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2=80 x 25 Black & white 3= 80 x 25 Color
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4=320 x 200 Medium resolution color
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5=320 x 200 Medium resolution black & white
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6=640 x 200 High resolution black & white
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--- 1 Set Cursor Type
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CH Start scan line (0-7 C/G, 0-14 Mono)
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CL End scan line (set start to 20H for no curs.)
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--- 2 Set Cursor Position
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DH,DL Row, column (0,0 = Home)
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BH Video page
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--- 3 Read Cursor Position
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BH Video page
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DH,DL Row, column (0,0 = Home)
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--- 4 Read Light Pen
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AH 0=Light pen not trig, 1=valid info in regs:
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DH,DL Row, column of character LP position
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CH Raster line
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BX Pixel column (0-319 med-res,0-619 hi-res)
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--- 5 Select Active Page
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AL New page (0-7 for 40x25,0-3 for 80x25)
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--- 6 Scroll Active Page Up
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--- 7 Scroll Active Page Down
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AL Number of lines to scroll (0 if entire screen)
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CH,CL Row, column of upper left corner
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DH,DL Row, column of lower right corner
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BH Attribute to use in blanked lines
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--- 8 Read Attribute / Character at current cursor position
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BH Video page
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AL Character read
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AH Attribute of char (alpha modes only)
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--- 9 Write Attribute / Character at current cursor position
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BH Video page
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CX Count of characters to write
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AL Character to write
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BL Attribute to write
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--- A Write Character only at current cursor position
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BH Video page
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CX Count of characters to write
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AL Character to write
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--- B Set Color Palette
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BH Palette color ID being set
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BL Color value to be used with that color ID
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--- C Write Dot
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DX,CX Row, column number
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AL Color value (If bit 7=1, value is OR'ed in)
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--- D Read Dot
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DX,CX Row, column number
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AL Dot read
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--- E Write Teletype to Active Page
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AL Character to write
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BL Foreground color in graphics mode
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--- F Get Current Video State
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AL Mode currently set (see func. 0)
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AH Columns on screen
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+--------------------------------------------------------------------------+
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| I B M P C B I O S I n t e r f a c e R o u t i n e s |
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+--------------------------------------------------------------------------+
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Intr Func In Out Comments
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# (AH) Regs Regs
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11 -------------------------------------------------+
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Intr Func In Out Comments
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# (AH) Regs Regs
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11 --------------- Equipment ---------------------------------------------
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None
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AX Equipment attached : Bits set as follows
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A H A L
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0 0 X 0 0 0 0 X 0 0 0 0 0 0 X 0
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--- - ----- --- --- --- -
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1 2 3 4 5 6 7
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1 Number of printers
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2 Game I/O
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3 RS232 cards
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4 Drives
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5 Initial video mode
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6 System board RAM
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7 IPL from diskette
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12 -------------- Memory Size ---------------------------------------------
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None
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AX Number of bytes in Kbytes
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13 ------------- Diskette I/O ---------------------------------------------
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--- 0 Reset Diskette System
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None None Hard resets all diskette drives, recal req'd
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--- 1 Read Diskette Status
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AL Status byte : Bits set as follows
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80 Attachment failed to respond
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40 Seek operation failed
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20 NEC controller failure
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10 Bad CRC on diskette read
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09 Attempt to DMA across a 64k bound
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08 DMA overrun on operation
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04 DMA overrun on operation
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03 Write attempted on wrt prot disk
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02 Address mark not found
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01 Bad command passed to diskette I/O
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--- 2 Read the desired sectors into memory
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--- 3 Write the desired sectors from memory
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--- 4 Verify the desired sectors
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--- 5 Format the desired track
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DL Drive number (0-3)
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DH Head number
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CH Track number
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CL Sector number
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AL Number of sectors (not used for format)
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ES:BX Address of buffer (not used for verify)
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AH Status of operation (see above)
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CY 1 if failed, 0 if ok
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+--------------------------------------------------------------------------+
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| I B M P C B I O S I n t e r f a c e R o u t i n e s |
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+--------------------------------------------------------------------------+
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Intr Func In Out Comments
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# (AH) Regs Regs
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14 ------------- RS-232 I/O -----------------------------------------------
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--- 0 Initialize Communications Port
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DX Interface card (0=COM1:, 1=COM2:)
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AL Parameters to set up : Bits are as follows
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A L
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0 0 0 0 0 0 0 0
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--- - --- -----
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1 2 3 4
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1 Word length (10=7 bit, 11=8 bit)
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2 Stopbits (0=1, 1=2)
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3 Parity (00=none, gth (10=7 bit, 11=8 bit)
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2 Stopbits (0=1, 1=2)
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3 Parity (00=none, 01=odd, 11=even)
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4 Baud (000=110, 001=150, 010=300, 011=600,
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100=1200, 101=2400, 110=4800, 111=9600)
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AH Set as in status (call 3)
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--- 1 Send Character to 100=1200, 101=2400, 110=4800, 111=9600)
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AH Set as in status (call 3)
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--- 1 Send Character to Communications Line
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DX Interface card (0=COM1:, 1=COM2:)
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AL Character to send
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AH Set as in status (call 3)
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--- 2 Recieve Character from Communications Line
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DX Interface card (0=COM1:, 1=COM2:)
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AL Character
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AH 0 if no error, set as status if nonzero
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--- 3 Get Communications Status
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DX Interface card (0=COM1:, 1=COM2:)
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AH Line status : Bits set as follows
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80 Time out
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40 Transmit shift reg empty
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20 Transmit holding reg empty
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10 Break detect
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08 Framing error
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04 Parity error
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02 Overrun error
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01 Data ready
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AL Modem status : Bits set as follows
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80 Recieved line signal detect
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40 Ring indicator
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20 Data set ready
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10 Clear to send
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08 Delta recieved line signal detect
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04 Trailing edge ring detector
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02 Delta data set ready
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01 Delta clear to send
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15 ----------- Cassette I/O ----( Obsolete )-------------------------------
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+--------------------------------------------------------------------------+
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| I B M P C B I O S I n t e r f a c e R o u t i n e s |
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+--------------------------------------------------------------------------+
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Intr Func In Out Comments
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# (AH) Regs Regs
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16 ----------- Keyboard I/O -----------------------------------------------
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--- 0 Read Next Character
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AL Character struck
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AH Scan code of key
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--- 1 Check Typeahead Status
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ZF 1 if no key available, 0 if key available
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AL,AH Character/Scan code if available. Keystroke
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remains in buffer.
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--- 2 Get Current Shift Status
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AL Shift flag status : Bits set as follows
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80 Insert state
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40 Caps lock state
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20 Num lock state
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10 Scroll lock state
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08 Alt shift is depressed
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04 Ctl shift is depressed
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02 Left shift is depressed
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01 Right shift is depressed
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17 ----------- Printer I/O ------------------------------------------------
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--- 0 Print Character
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DX Printer to be used (0,1,2)
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AL Character to print
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AH Status set as in call 2
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--- 1 Initialize Printer Port
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DX Printer to be used (0,1,2)
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AH Status set as in call 2
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--- 2 Get Printer Status
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DX Printer to be used (0,1,2)
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AH Printer status : Bits set as follows
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80 Not busy (ready?)
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40 Acknowledge
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20 Out of paper
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10 Selected
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08 I/O error
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01 Time out
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