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Rev 388 Rev 413
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    movzx    esp, sp
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    movzx    esp, sp
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        push    0
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        push    0
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        pop     es
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        pop     es
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        and     word [es:0x9031], 0
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; \begin{Mario79}
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; find HDD IDE DMA PCI device
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        and     word [es:0x9031], 0
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; check for PCI BIOS
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        mov     ax, 0xB101
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        mov     ax, 0xB101
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        int     0x1A
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        int     0x1A
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        jc      .nopci
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        jc      .nopci
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        cmp     edx, 'PCI '
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        cmp     edx, 'PCI '
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        jnz     .nopci
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; find PCI class code
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; class 1 = mass storage
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; subclass 1 = IDE controller
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        jnz     .nopci
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; a) class 1, subclass 1, programming interface 0x80
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        mov     ax, 0xB103
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        mov     ax, 0xB103
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        mov     ecx, 1*10000h + 1*100h + 0x80
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        mov     ecx, 1*10000h + 1*100h + 0x80
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        mov     si, 0   ; device index = 0
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        mov     si, 0   ; device index = 0
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        int     0x1A
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        int     0x1A