[Àû¿ë´ë»ó: 0.74_SVN_new, DOSBox-x]

If non-zero, the VESA BIOS will report the linear framebuffer as offset by this many scanlines.

For example, if the LFB is at 0xC0000000 and you need the demo to draw 2 scan lines lower,

at 0xC0000000 + (320*2) (320x240x256 mode), you would set this to 2. This option should be set
to zero by default unless needed for certain DOS demos that have sloppy VESA linear framebuffer
rendering code that renders a few scanlines UP into undefined memory preceeding the linear framebuffer.

This option DOES NOT affect the visible offset of the linear framebuffer, it only affects the physical
memory location reported by VESA BIOS emulation.