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BIOS: Difference between revisions
→BIOS functions
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==BIOS functions==
To access a BIOS function, you generally set the AH [[CPU Register|CPU register]] (or AX, or EAX) to a particular value, and then do
an INT opcode. The value in AH (or AX, or EAX), combined with the particular interrupt number selected requests a specific
BIOS function. (Other CPU registers hold any "arguments" to the function, and often the return values from the function, also.)
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Try to always test these error returns, because in many circumstances the BIOS functions might appear to be returning valid
(but very wrong) data -- rather than an error code.
==BIOS in Protected Mode==
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