VIDEOMODE
Purpose: Sets the current video mode during system start-up.
Syntax: VIDEOMODE =[SOFT]<mm|MONO|CO80|BW80|CO40|BW40>
Where, mm is the decimal number of the current mode
Note:
The SOFT prefix adds 128 to the video mode number set by the user in
order to save the contents of the video buffer. This operation is only
applicable to EGA video adapters or compatibles.