Mailing List Archive: Spec buffer size 13h v 13

Bruce Robson wrote:
> Whilst looking at the 3.61 isolinux.asm file I noticed that the code
> uses a spec buffer size of 13h for the initial BIOS call with the
> drive number passed in in DL. It then uses a spec buffer size of 13
> when scanning drive numbers from FFh to 81h
>
> Line 291 is
> mov byte [spec_packet],13h
>
> Lines 576 to 577 are
> mov si,spec_packet
> mov byte [si],13 ; Size of buffer
>
> Is the use of 13 an error or is there some reason I don't understand ?
>

13 is a bug, 13h is correct. This probably comes from a misreading of
the spec, as the spec is written without highlighting hexadecimal
numbers in any way.

-hpa

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