OSDev.org

can anybody tell me whether i can use dos interrupts in my os . if yes, does this mean that it resides in bios just like other bios interrupts .

Sorry, the answer is no.

All the INT 0x21 dos calls are "hooked" by dos, when dos boots. The code for those calls is entirely inside dos, and none of it is in the BIOS. So none of it is available unless dos is booted and running.

bewing wrote:All the INT 0x21 dos calls are "hooked" by dos, when dos boots. The code for those calls is entirely inside dos, and none of it is in the BIOS. So none of it is available unless dos is booted and running.

Which of course didn't stop Win95 being called an 'OS' :).


JAL