CODEWITHSUNDEEP
bios
Joseph
Joseph

Reputation: 125

bios interrupt and dos interuppt

what is the difference between dos interuppt and bios interuppt

Upvotes: 0

Views: 2204

Answers (1)

Greg Hewgill
Greg Hewgill

Reputation: 994391

In 16-bit 80x86 programming, user programs communicate with system service using interrupts. Typically this takes the form of:

  1. Loading a register (often AH) with a numeric function code
  2. Loading any other registers with parameters as required by the function
  3. Executing the INT instruction with an interrupt vector number

The BIOS offers its own services under a few different interrupt vector numbers, for example:

  • INT 10h - video services
  • INT 13h - disk services

DOS, since it is a separate component from the BIOS, offers its services under INT 21h.

Upvotes: 2

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