Video Mode Driver ver.1.0 for MenuetOS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This driver provide of hardware operation of all VGA-compatible videocard


P.S.
It may be added to SYSFUNCS.TXT

21 = SETUP FOR DEVICES

     ebx = 13 - videodriver enable
            ecx = 1 - Get DriverInfo and Driver Initial Set
                  edx = offset to 512-bytes area for DriverInfo
                           RETURN: eax = -1  - errors or driver not installed in system
                                            eax = 'MDAZ' - driver ID => set information in info area
                                                        Info Structure: 
                                                                              +0   - Full driver name (ASCII string )
                                                                              +32  - Driver version (dword)
                                                                              +36 - Reserved
                                                                              +64  - List of support videomodes
                                                                                         (max 32 positions) (word)
                                                                              +128 - List of Support vertical rate 
                                                                                          to each present mode (word):
                                                                                           +0 - 1st ver.rate for mode0
                                                                                           +2 - 2st ver.rate for mode0
                                                                                           +4 - 3st ver.rate for mode0
                                                                                           +8 - 4st ver.rate for mode0
                                                                                           +10 - 5st ver.rate for mode0

                                                                                           +12 - 1st ver.rate for mode1
                                                                                           +14 - 2st ver.rate for mode1
                                                                                           +16 - 3st ver.rate for mode1
                                                                                           +18 - 4st ver.rate for mode1
                                                                                           +20 - 5st ver.rate for mode1
      
            ecx = 2 - Get Current Video Mode With Vertical Refresh Rate
                           RETURN: eax = -1  - errors
                                            eax = X_screen*65536+Y_screen
                                                ebx = current vertical rate
                                                ecx = current video mode (number) [see infostruct]
            ecx = 3 - Change Video Mode
                  edx = VertRate*65536+VideoMode [see infostruct]
                           RETURN: eax = -1  - errors
                                            eax = 0 - set new videomode
            ecx = 4 - Return at Start System Video Mode
                           RETURN: eax = -1  - errors
                                            eax = 0 - set initial videomode
            ecx = 5 - Change vertical and horizontal size of visible screen area
                  edx = 0/1 - -/+ horizontal size on 1 position
                        = 2/3 - -/+ vertical size on 1 position (8 pixels)  (not complete yet)
                           RETURN: eax = -1  - errors
                                            eax = 0 - succesfull