strange vga error

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phunk

Joined: 27 Feb 2005
Posts: 2

phunk 27 Feb 2005, 05:48

well, here's my problem
i'm trying to just play with vga a little bit, right
here's the basic code i have so far:

Code:

        org     0x100
        use16

vgainit:
        push    0xA000
        pop     es
        mov     ax, 0x13
        int     0x10

begin:
        call    vgainit
        ret

it assembles fine, the problem is my monitor, it says it's using an invalid frequency. anyone have any suggestions?

27 Feb 2005, 05:48

crc

Joined: 21 Jun 2003
Posts: 637
Location: Penndel, PA [USA]

crc 27 Feb 2005, 13:39

I can't help with the invalid frequency issue, but that code should hang the computer in an endless loop. A fixed version is:

Code:

        org     0x100
        use16

; in the code that was posted, vgainit was run, then begin CALLed
; it again. Since this continued happening the system would eventually
; crash when it ran out of stack space.

begin:
        call    vgainit
        int    0x20      ; exit the program

vgainit:
        push    0xA000
        pop     es
        mov     ax, 0x13
        int     0x10
        ret                 ; exit this routine

27 Feb 2005, 13:39

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