Any way to list BIOS drive numbers in real mode

Question

Is there a way to list the BIOS disk indices in real mode (e.g. 0x80, 0x81 ...)?

I did not find an interrupt that is responsible for listing drive numbers.

Answer 1

I do not know how to "enumerate" the available bios disks in real mode.

However, there are some things that may help:

• Number of hard drives stored 40:75in the BIOS the Data Area . Although I do not know that drive numbers are assigned sequentially, I would expect them to be. If so, the list of hard drives will run from 0x80 to 0x80 + (40:75 - 1) (although there may possibly be 0 hard drives, so 0x80 may also be invalid).
• There is also int 21h function 0E (select the default drive) that returns the "highest drive". Without verification, I assume this is due to LastDrive , but it might be useful.
• , , int 13h function 08 ( ) , . , DOS 26 ( , -, ..), .

, bios . , # 0 0x80, # 1 - 0x81 .. 0.

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