BIOS Interrupt Calls.
Interrupt calls are a functionality provided by BIOS to get particular data from system and save them in the Registers of the CPU. (See The Appendix to find out what are x86 registers.) They invoked in particular way,
int inturrptVecotr in hex
From this manner we can call a particular interrupt and retrieve values from system. The manufactures provide a documentation of interrupt Vectors. They specify which interrupt can return which values. There are so many conditions and those conditions gives different information. The complete description of the interrupt vectors are giving in below reference's.
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