is dos interrupts available in bios

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shivanth
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Joined: Thu Aug 28, 2008 6:42 am

is dos interrupts available in bios

Post by shivanth »

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 .
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bewing
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Re: is dos interrupts available in bios

Post by bewing »

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.
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jal
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Re: is dos interrupts available in bios

Post by jal »

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
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