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 Post subject: Bootloader problem: INT13h not supported.
PostPosted: Sat Apr 22, 2017 12:48 pm 
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G'day mates,
Tim here,
I have this problem after I have finished the FAT32 bootloader, but it says that INT13h is not supported. I even made a bootloader zip file so you can correct me somewhere.
Any suggestions?
Sincerely,
Tim.


Attachments:
File comment: Bootloader Pack, v0.1
bootloader.zip [5.46 KiB]
Downloaded 27 times

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 Post subject: Re: Bootloader problem: INT13h not supported.
PostPosted: Sat Apr 22, 2017 1:22 pm 
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Code:
mov ah, 0x41
mov bx, 0xAA55
int 0x13

I think the error message is coming from your MBR. Check page 29.

Code:
jnc No_MBR

What happens if the BIOS sets the carry flag when it loads your VBR?


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 Post subject: Re: Bootloader problem: INT13h not supported.
PostPosted: Sat Apr 22, 2017 1:29 pm 
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Actually, the MBR is fine. It might have to deal with the VBR.


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int13h.PNG
int13h.PNG [ 1.87 KiB | Viewed 1978 times ]

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 Post subject: Re: Bootloader problem: INT13h not supported.
PostPosted: Sat Apr 22, 2017 1:41 pm 
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TimothyWilliams wrote:
Actually, the MBR is fine.

There's a difference between "it works" and "it works correctly".

TimothyWilliams wrote:
It might have to deal with the VBR.

The INT 0x13 extensions are not supported on floppy disk drives. (And even if they were, you can't fit a valid FAT32 filesystem on a floppy disk.)


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