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RBBS in a Box Volume 1 #3.1
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RBBSIABOX31.cdr
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dosref.doc
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1987-10-03
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Interrupt Address Function BIOS Entry ( * = see table )
Vector (Hex)
0 00-03 Divide by Zero Unused (D11 A-81)
1 04-07 Single Step Unused (D11 A-81)
2 08-0B Nonmaskable NMI_INT (A-72)
3 0C-0F Breakpoint Unused (D11 A-81)
4 10-13 Overflow Unused (D11 A-81)
5 14-17 Print Screen PRINT_SCREEN (A-81)
6 18-1B Reserved Unused (D11 A-81)
7 1C-1F Reserved Unused (D11 A-81)
8 20-23 Time of Day TIMER_INT (A-79)
9 24-27 Keyboard KB_INT (A-28)
A 28-2B Reserved [ ] Unused (D11 A-81)
B 2C-2F Communications [ 8259 ] Unused (D11 A-81)
C 30-33 Communications [ ] Unused (D11 A-81)
D 34-37 Disk Unused (D11 A-81)
E 38-3B Diskette DISK_INT (A-43)
F 3C-3F Printer Unused (D11 A-81)
10 * 40-43 Video VIDEO_IO (A-46)
11 * 44-47 Equipment Check EQUIPMENT (A-72)
12 * 48-4B Memory MEMORY_SIZE_DET (A-71)
13 * 4C-4F Diskette/Disk DISKETTE_IO (A-35)
14 * 50-53 Communications RS232_IO (A-22)
15 54-57 Cassette CASSETTE_IO (A-72)
16 * 58-5B Keyboard KEYBOARD_IO (A-24)
17 * 5C-5F Printer PRINTER_IO (A-45)
18 60-63 Resident BASIC F600:0000
19 64-67 Bootstrap BOOT_STRAP (A-20)
1A * 68-6B Time of day TIME_OF_DAY (A-79)
1B 6C-6F Keyboard Break DUMMY_RETURN (A-81)
1C 70-73 Timer Tick DUMMY_RETURN (A-81)
1D 74-77 Video Initialization VIDEO_PARMS (A-48)
1E 78-7B Diskette Parameters DISK_BASE (A-44)
1F 7C-7F Video Graphics Characters 0
20 * 80-83 General program termination
21 84-87 DOS function request
22 88-8B Called program termination address
23 8C-8F Control Break termination address
24 90-93 Critical error handler
25 94-97 Absolute disk read
26 98-9B Absolute disk write
27 9C-9F Terminate but stay resident
Interrupt Address Function BIOS Entry
Vector (Hex)
0 00-03 Divide by Zero Unused (D11 A-81)
1 04-07 Single Step Unused (D11 A-81)
2 08-0B Nonmaskable NMI_INT (A-72)
3 0C-0F Breakpoint Unused (D11 A-81)
4 10-13 Overflow Unused (D11 A-81)
5 14-17 Print Screen PRINT_SCREEN (A-81)
6 18-1B Reserved Unused (D11 A-81)
7 1C-1F Reserved Unused (D11 A-81)
8 20-23 Time of Day TIMER_INT (A-79)
9 24-27 Keyboard KB_INT (A-28)
A 28-2B Reserved [ ] Unused (D11 A-81)
B 2C-2F Communications [ 8259 ] Unused (D11 A-81)
C 30-33 Communications [ ] Unused (D11 A-81)
D 34-37 Disk Unused (D11 A-81)
E 38-3B Diskette DISK_INT (A-43)
F 3C-3F Printer Unused (D11 A-81)
┌─────────────────────────────────────────────────────────────────────────┐
│ 10 40-43 Video VIDEO_IO (A-46) │
├───┬─────────────────────────────────────────────────────────────────────┤
│ │ AH=0 Set Mode │
│ ├──┬───────────────────────────────┬──────────────────────────────────┤
│ │ │ AL=0 40X25 BW (POR Default) │ AL=4 320X200 Color │
│ │ │ AL=1 40X25 Color │ AL=5 320X200 BW │
│ │ │ AL=2 80X25 BW │ AL=6 640X200 BW │
│ │ │ AL=3 80X25 Color │ AL=7 80X25 Monochrome Card │
│ ├──┴───────────────────────────────┴──────────────────────────────────┤
│ │ AH=1 Set Cursor Type │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ CH= Bits 4-0 = Start Line for Cursor │
│ │ │ CL= Bits 4-0 = End Line for Cursor │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=2 Set Cursor Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ DH,DL= Row,Column (0,0 is upper left) │
│ │ │ BH= Page Number (Must be 0 for graphics modes) │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=3 Read Cursor Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ BH= Page Number (Must be 0 for graphics modes) │
│ │ │ On Exit DH,DL= Row,Column │
│ │ │ CH,CL= Cursor Mode Currently Set │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=4 Read Light Pen Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ On Exit AH=0 Light Pen Switch Not Down/Not Triggered │
│ │ │ AH=1 Valid Light Pen Value in Registers │
│ │ │ DH,DL= Row,Column of Character Light Pen Position │
│ │ │ CH= Raster Line (0-199) │
│ │ │ BX= Pixel Column (0-319 or 639) │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=5 Select Active Display Page │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ AL= New Page (0-7 for Modes 0&1, 0-3 for Modes 2&3) │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=6 Scroll Active Page Up │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ AL= Number of Lines, Input Lines Blanked at Bottom of Window │
│ │ │ 0 Means Blank Entire Window │
│ │ │ CH,CL= Row,Column of Upper Left Corner of Scroll │
│ │ │ DH,DL= Row,Column of Lower Right Corner of Scroll │
│ │ │ BH= Attribute to be used on blank line │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=7 Scroll Active Page Down │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ AL= Number of Lines, Input Lines Blanked at Top of Window │
│ │ │ 0 Means Blank Entire Window │
│ │ │ CH,CL= Row,Column of Upper Left Corner of Scroll │
│ │ │ DH,DL= Row,Column of Lower Right Corner of Scroll │
│ │ │ BH= Attribute to be used on blank line │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=8 Read Attribute/Character at Current Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ BH= Display Page (Valid for alpha modes only) │
│ │ │ On Exit AL= Character Read │
│ │ │ AH= Attribute of Character Read (alpha modes only) │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=9 Write Attribute/Character at Current Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ BH= Display Page (Valid for alpha modes only) │
│ │ │ CX= Count of Characters to Write │
│ │ │ AL= Character to Write │
│ │ │ BL= Attribute of Character (alpha)/Color of Character (graphics) │
│ │ │ If Bit 7 = 1 color value is exclusive or'd with current value│
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=10 Write Character Only at Current Position │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ BH= Display Page (Valid for alpha modes only) │
│ │ │ CX= Count of Characters to Write │
│ │ │ AL= Character to Write │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=11 Set Color Palette │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ BH= Palette Color ID being set (0 or 1) │
│ │ │ BL= Color Value to be used with that Color ID │
│ │ │ Color ID = 0 selects background color (0-15) │
│ │ │ Color ID = 1 selects palette to be used │
│ │ │ Palette = 0: Green(1)/Red(2)/Yellow(3) │
│ │ │ Palette = 1: Cyan(1)/Magenta(2)/White(3) │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=12 Write Dot │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ DX= Row Number │
│ │ │ CX= Column Number │
│ │ │ AL= Color Value │
│ │ │ If Bit 7 = 1 color value is exclusive or'd with current value│
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=13 Read Dot │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ DX= Row Number │
│ │ │ CX= Column Number │
│ │ │ AL= Returns the Dot Read │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=14 Write Teletype to Active Page │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ AL= Character to write │
│ │ │ BL= Foreground color in graphics mode │
│ ├──┴──────────────────────────────────────────────────────────────────┤
│ │ AH=15 Current Video State │
│ ├──┬──────────────────────────────────────────────────────────────────┤
│ │ │ On Exit AL= Mode currently set │
│ │ │ AH= Number of character columns on screen │
│ │ │ BH= Current active display page │
└───┴──┴──────────────────────────────────────────────────────────────────┘
11 44-47 Equipment Check EQUIPMENT (A-72)
┌─────────────────────────────────────────────────────────────────────┐
│ AX is set to indicate attached I/O │
├──┬──────────────────────────────────────────────────────────────────┤
│ │ Bit 15,14= Number of printers attached │
│ │ Bit 13 = Not used │
│ │ Bit 12 = Game I/O attached │
│ │ Bit 11,10,9= Number of RS232 cards attached │
│ │ Bit 8 = Not used │
│ │ Bit 7,6 = Number of diskette drives (only if Bit 0 = 1) │
│ │ 00=1, 01=2, 10=3, 11=4 │
│ │ Bit 5,4= Initial video mode │
│ │ 00= Unused │
│ │ 01= 40X25 BW using color card │
│ │ 10= 80X25 BW using color card │
│ │ 11= 80X25 BW using BW card │
│ │ Bit 3,2= Planar RAM size (00=16K,01=32K,10=48K,11=64K) │
│ │ Bit 1 = Not used │
│ │ Bit 0 = IPL from diskette (there are drives present in system) │
└──┴──────────────────────────────────────────────────────────────────┘
12 48-4B Memory MEMORY_SIZE_DET (A-71)
┌─────────────────────────────────────────────────────────────────────┐
│ AX= Number of contiguous 1K blocks of memory │
└─────────────────────────────────────────────────────────────────────┘
13 4C-4F Diskette/Disk DISKETTE_IO (A-35)
┌─────────────────────────────────────────────────────────────────────┐
│ AH=0 Reset the Diskette System │
├─────────────────────────────────────────────────────────────────────┤
│ AH=1 Read the Status of the system into AL │
├─────────────────────────────────────────────────────────────────────┤
│ AH=2 Read the desired sectors into memory │
├─────────────────────────────────────────────────────────────────────┤
│ AH=3 Write the desired sectors from memory │
├─────────────────────────────────────────────────────────────────────┤
│ AH=4 Verify the desired sectors │
├─────────────────────────────────────────────────────────────────────┤
│ AH=5 Format the desired track │
├──┬──────────────────────────────────────────────────────────────────┤
│ │For Read/Write/Verify/Format │
│ ├──┬───────────────────────────────────────────────────────────────┤
│ │ │ Input │
│ │ ├──┬────────────────────────────────────────────────────────────┤
│ │ │ │ DL= Drive Number (0-3) (value checked) │
│ │ │ │ DH= Head Number (0-1) │
│ │ │ │ CH= Track Number (0-39) │
│ │ │ │ CL= Sector Number (1-8) (not used for format) │
│ │ │ │ AL= Number of sectors(1-8) (not used for format) │
│ │ │ │ ES:BX= address of buffer (not required for verify) │
│ │ ├──┴────────────────────────────────────────────────────────────┤
│ │ │ Output │
│ │ ├──┬────────────────────────────────────────────────────────────┤
│ │ │ │ AH= status of operations │
│ │ │ ├──┬─────────────────────────────────────────────────────────┤
│ │ │ │ │ 80H= attachment failed to respond │
│ │ │ │ │ 40H= seek operation failed │
│ │ │ │ │ 20H= NEC controller has failed │
│ │ │ │ │ 10H= Bad CRC on diskette read │
│ │ │ │ │ 09H= attempt to DMA accross 64K boundary │
│ │ │ │ │ 08H= DMA overrun on operation │
│ │ │ │ │ 04H= requested sector not found │
│ │ │ │ │ 03H= write attempted on write protected diskette │
│ │ │ │ │ 02H= address mark not found │
│ │ │ │ │ 01H= bad command passed to diskette I/O │
│ │ │ ├──┴─────────────────────────────────────────────────────────┤
│ │ │ │ CY= 0 successful operation, AH=0 │
│ │ │ │ CY= 1 Failed operation │
└──┴──┴──┴────────────────────────────────────────────────────────────┘
14 50-53 Communications RS232_IO (A-22)
AH=0 Initialize communications port
AL=Parms:
7 6 5 4 3 2 1 0
------Baud ------ -Parity-- StopBit --WordLength
000 - 110 X0 - none 0 - 1 10 - 7 bits
001 - 150 01 - odd 1 - 2 11 - 8 bits
010 - 300 11 - even
011 - 600
100 - 1200
101 - 2400
110 - 4800
111 - 9600
On Exit, registers set as in AH=3
AH=1 send the character in AL over the commo line
On Exit, AH bit 7 = 1 if unable to transmit byte
AH=2 receive a character in AL from commo line
AH=3 return the commo port status in AX
AH contains the line status
Bit 7 = time out
Bit 6 = trans shift register empty
Bit 5 = tran holding register empty
Bit 4 = break detect
Bit 3 = framing error
Bit 2 = parity error
Bit 1 = overrun error
Bit 0 = data ready
AL contains the modem status
Bit 7 = received line signal detect
Bit 6 = ring indicator
Bit 5 = data set ready
Bit 4 = clear to send
Bit 3 = delta receive line signal detect
Bit 2 = trailing edge ring detector
Bit 1 = delta data set ready
Bit 0 = delta clear to send
DX= parameter indicating which RS232 card (0,1)
15 54-57 Cassette CASSETTE_IO (A-72)
16 58-5B Keyboard KEYBOARD_IO (A-24)
AH=0 read the next ASCII character struck from the keyboard
return the result in AL, scan code in AH
AH=1 set the Z flag to indicate if an ASCII character is
available to be read ZF=0 code is available
AH=2 return the current shift status in AL
Bit 7= insert state is active
Bit 6= caps lock state has been toggled
Bit 5= num lock state has been toggled
Bit 4= scroll lock state has been toggled
Bit 3= alternate shift key depressed
Bit 2= control shift key depressed
Bit 1= left shift key depressed
Bit 0= right shift key depressed
17 5C-5F Printer PRINTER_IO (A-45)
AH=0 print the character in AL
On Exit, AH=1 if character could not be printed (time out)
AH=1 initialize the printer port
AH=2 read the printer status into AH
Bit 7= 1=not busy
Bit 6= 1=acknowledge
Bit 5= 1=out of paper
Bit 4= 1=selected
Bit 3= 1= I/O error
Bit 2,1 unused
Bit 0= 1=Time Out
DX= Printer to be used (0,1,2)
18 60-63 Resident BASIC F600:0000
19 64-67 Bootstrap BOOT_STRAP (A-20)
1A 68-6B Time of day TIME_OF_DAY (A-79)
AH= 0 read the current clock setting
On Exit CX= high portion of count
DX= low portion of count
AL= 0 if timer has not passed 24 hours since last read
AH=1 set the current clock
CX= high portion of count
DX= low portion of count
1B 6C-6F Keyboard Break DUMMY_RETURN (A-81)
1C 70-73 Timer Tick DUMMY_RETURN (A-81)
1D 74-77 Video Initialization VIDEO_PARMS (A-48)
1E 78-7B Diskette Parameters DISK_BASE (A-44)
1F 7C-7F Video Graphics Characters 0
20 80-83 General program termination
21 84-87 DOS function request
22 88-8B Called program termination address
23 8C-8F Control Break termination address
24 90-93 Critical error handler
25 94-97 Absolute disk read
26 98-9B Absolute disk write
27 9C-9F Terminate but stay resident
Function Call Summary ( * = not documented )
Number Description
0 Program Terminate
1 Keyboard input.
2 Display output.
3 Auxiliary (Async) input.
4 Auxiliary (Axync) output.
5 Printer output.
6 Direct console I/O.
7 Direct console input without echo.
8 Console input without echo.
9 Print string.
A Buffered keyboard input.
B Check standard input status.
C Clear keyboard buffer and invoke a keyboard function.
D Disk reset.
E Select disk.
F Open file.
10 Close a file
11 Search for the first entry.
12 Search for the next entry.
13 Delete file.
14 Sequential read.
15 Sequential write.
16 Create file.
17 Rename file.
18 *Unused.
19 Current disk.
1A Set disk transfer address.
1B Allocation table information.
1C Allocation table information for specific drive.
1D *Unused.
1E *Unused.
1F *Get the default DOS Parameter Block in DS:BX
20 *Unused.
21 Random read.
22 Random write.
23 File size.
24 Set random record field.
25 Set interrupt vector.
26 Create a new program segment.
27 Random block read.
28 Random block write.
29 Parse filename.
2A Get date.
2B Set date.
2C Get time.
2D Set time.
2E Set/reset verify switch.
2F Get DTA.
30 Get DOS version number.
31 Terminate process and remain resident.
32 *Get the Dos Parameter Block of disk # in DL
33 Ctrl-Break check.
35 Get vector.
36 Get disk free space.
37 *Get switch character
38 Return country dependent information (international).
39 Create a subdirectory.
3A Remove a directory entry.
3B Change the current directory.
3C Create a file.
3D Open a file.
3E Close a file handle.
3F Read from a file or device.
40 Write to a file or device.
41 Delete a file from a specified directory.
42 Move file read/write pointer.
43 Change file mode.
44 I/O control for devices.
45 Duplicate a file handle.
46 Force a duplicate of a handle.
47 Get current directory.
48 Allocate memory.
49 Free allocated memory.
4A Modify allocated memory blocks.
4B Load or execute a program.
4C Terminate a process.
4D Retrieve the return code of a sub-process.
4E Find first matching file.
4F Find next matching file.
50 *Set PSP
51 *Get PSP
52 *????
53 *Set initial Dos Parameter Block
54 Get verify state.
55 *Duplicate PSP and make the new one active
56 Rename a file.
57 Get/Set a file's date and time.
