Bochs - Real Mode int 13h extension support

[deph]

Can anyone explain why Bochs sets CF 1 when I use int 13h, ah = 41 on dl=0x80 (hdd) ... Yes, I know - it says it does not support extensions ... but WHY ?! shouldn't it ?

[Combuster]

ah=41 and ah=41h kindof makes a big difference

[deph]

Yes, it does

Code: Select all

    movb $0x41, %ah
    movb $0x80, %dl
    movw $0x55AA, %bx
    int $0x13

    jnc 1f
    movw $0xFFFF, %ax

1:
    ...

Hmm ... AX is 0xFFFF at the end ... shouldn't be like that ...

[deph]

Sorry, it's my fault ... I had no hdd set in bochs.conf ;

[deph]

Ok, now I created a disk image, and after calling int 0x13 ah=0x41 result is CF=0, AH=0x30 (i think it's the major version number ... ?); but now when I call int 0x13 with AH=0x48, it sets CF=1 (...and AH=0x01 !) ... Does anyone have an idea why ?

From bochs.conf:

Code: Select all

ata0: enabled=1, ioaddr1=0x1F0, ioaddr2=0x3F0, irq=14
ata0-master: type=disk, path="./hdd.img", mode=flat, cylinders=20805, heads=16, spt=63, translation=lba

Where hdd.img is a 10GB hard image