flat assembler - IBM/MS INT 13 Extensions - INSTALLATION CHECK version 1.2??

I just tested a little boot code program to check which version of IBM/MS INT 13 Extensions have my old computer (a Cyrix 586). Ralf brown interrupt list provides the following values to determinate the version:

Ralf Brown wrote:

AH = major version of extensions
01h = 1.x
20h = 2.0 / EDD-1.0
21h = 2.1 / EDD-1.1
30h = EDD-3.0

The problem is that the BIOS does not set the carry flag and change BX to AA55h so it means that the BIOS reports that the extentions are installed but in AH the value is 02h :S

Should I consider 02h as version 1.2 or it's a BIOS bug? My boot code reports version 0.2 because I do special processing with 01h only.

[edit] I forgot to say, I tested the same boot code on my new computer and it reports version 3.0[/edit]

[edit2] I repleased the attachment with a new boot code that provides more info (it show which set of functions are supported).

On my athlon64 says that "Extended disk access functions (AH=42h-44h,47h,48h)" and "Enhanced disk drive (EDD) functions (AH=48h,AH=4Eh)" are supported but in my 586 only EDD is supported. It seems to be true because the code below doesn't work on the 586 while in the athlon64 does

Code:

; Should be executed under a debugger
org 100h

      mov ah, 42h
      mov dl, 80h
      mov si, packet
      push  ds
      pop   [seg]
      int 13h
      int3

packet:

db 10h
db 0
dw 1
dw 7c00h
seg dw 0
dq 0

[/edit2]

[/edit3] Improved source code readability...[/edit3]