Function 21, subfunction 13, subsubfunction 5 - increase/decrease the size of the visible area of monitor.
Parameters:
- eax = 21 - function number
- ebx = 13 - subfunction number
- ecx = 5 - number of the driver function
- edx = 0/1 - decrease/increase horizontal size on 1 position
- edx = 2/3 - is not supported in the current implementation;
is planned as decrease/increase vertical size on 1 position
Returned value:
- eax = -1 - driver is not loaded or not initialized
- eax = 0 - success
- ebx, ecx destroyed
Remarks:
- Driver must be initialized by call to driver function 1.
- Function influences only the physical size of the screen image;
the logical size (number of pixels) does not change.