video mode

[xxxx]

                                                                        MOV AH,00
                                                                         MOV AL,06
                                                                         INT 10H



when i execute a program that contains that instructions the screen goes blank.what's the problem?i'm guessing that the monitor dosen't support it
                                                                         

[thomasantony]

AFAIK,  The screen gets cleared when you set a new video mode

Thomas Antony :U

[MichaelW]

Bit 7 of the mode value controls whether or not the display memory is erased at mode set. If bit 7 is set (e.g. 86h for mode 6) then the display memory is not erased.  But if you are changing from an alphanumeric mode to a graphics mode then you probably should erase the display memory because the alphanumeric modes use the bit planes to store characters, attributes, and font bit patterns, and this data would appear as garbage in the graphics modes.