BiosCentral – BIOS Services
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Intel Motherboards:
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T440BX
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VC820
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The following is a list of
the standard BIOS interrupts used in a typical BIOS.
|
Interrupt
|
Address |
Type
|
Description
|
| 00h |
0000:0000h |
Processor |
Divide by zero |
| 01h |
0000:0004h |
Processor |
Single step |
| 02h |
0000:0008h |
Processor |
Non maskable interrupt
(NMI) |
| 03h |
0000:000Ch |
Processor |
Breakpoint |
| 04h |
0000:0010h |
Processor |
Arithmetic overflow |
| 05h |
0000:0014h |
Software |
Print screen |
| 06h |
0000:0018h |
Processor |
Invalid op code |
| 07h |
0000:001Ch |
Processor |
Coprocessor not available |
| 08h |
0000:0020h |
Hardware |
System timer service
routine |
| 09h |
0000:0024h |
Hardware |
Keyboard device service
routine |
| 0Ah |
0000:0028h |
Hardware |
Cascade from 2nd programmable
interrupt controller |
| 0Bh |
0000:002Ch |
Hardware |
Serial port service -
COM post 2 |
| 0Ch |
0000:0030h |
Hardware |
Serial port service -
COM port 1 |
| 0Dh |
0000:0034h |
Hardware |
Parallel printer service
– LPT 2 |
| 0Eh |
0000:0038h |
Hardware |
Floppy disk service |
| 0Fh |
0000:003Ch |
Hardware |
Parallel printer service
– LPT 1 |
| 10h |
0000:0040h |
Software |
Video service routine |
| 11h |
0000:0044h |
Software |
Equipment list service
routine |
| 12h |
0000:0048H |
Software |
Memory size service routine |
| 13h |
0000:004Ch |
Software |
Hard disk drive service |
| 14h |
0000:0050h |
Software |
Serial communications
service routines |
| 15h |
0000:0054h |
Software |
System services support
routines |
| 16h |
0000:0058h |
Software |
Keyboard support service
routines |
| 17h |
0000:005Ch |
Software |
Parallel printer support
services |
| 18h |
0000:0060h |
Software |
Load and run ROM BASIC |
| 19h |
0000:0064h |
Software |
DOS loading routine |
| 1Ah |
0000:0068h |
Software |
Real time clock service
routines |
| 1Bh |
0000:006Ch |
Software |
CRTL – BREAK service
routines |
| 1Ch |
0000:0070h |
Software |
User timer service routine |
| 1Dh |
00000074h |
Software |
Video control parameter
table |
| 1Eh |
0000:0078h |
Software |
Floppy disk parameter
routine |
| 1Fh |
0000:007Ch |
Software |
Video graphics character
routine |
| 20h-3Fh |
0000:0080f – 0000:00FCh |
SOftware |
DOS interrupt points |
| 40h |
0000:0100h |
Software |
Floppy disk revector
routine |
| 41h |
0000:0104h |
Software |
hard disk drive C: parameter
table |
| 42h |
0000:0108h |
Software |
EGA default video driver |
| 43h |
0000:010Ch |
Software |
Video graphics characters |
| 44h |
0000:0110h |
Software |
Novel Netware API |
| 45h |
0000:0114h |
Software |
Not used |
| 46h |
0000:0118h |
Software |
Hard disk drive D: parameter
table |
| 47h |
0000:011Ch - |
Software |
Not used |
| 48h |
|
Software |
Not used |
| 49h |
0000:0124h |
Software |
Not used |
| 4Ah |
0000:0128h |
Software |
User alarm |
| 4Bh-63h |
0000:012Ch – |
Software |
Not used |
| 64h |
|
Software |
Novel Netware IPX |
| 65h-66h |
|
Software |
Not used |
| 67h |
|
Software |
EMS support routines |
| 68h-6Fh |
0000:01BCh |
Software |
Not used |
| 70h |
0000:01c0h |
Hardware |
Real time clock |
| 71h |
0000:01C4h |
Hardware |
Redirect interrupt cascade |
| 72h-74h |
0000:01C8h – 0000:01D0h |
Hardware |
Reserved – Do not use |
| 75h |
0000:01D4h |
Hardware |
Math coprocessor exception |
| 76h |
0000:01D8h |
Hardware |
Hard disk support |
| 77h |
0000:01DCh |
Hardware |
Suspend request |
| 78h-79h |
0000:01E0h – |
Hardware |
Not used |
| 7Ah |
|
Software |
Novell Netware API |
| 78h-FFh |
0000:03FCh |
Software |
Not used |
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System
Specific Diagnostic and POST Error Messages:
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