53 lines
3.7 KiB
Plaintext
Executable File
53 lines
3.7 KiB
Plaintext
Executable File
Video Mode Driver ver.1.0 for MenuetOS
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This driver provide of hardware operation of all VGA-compatible videocard
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P.S.
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It may be added to SYSFUNCS.TXT
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21 = SETUP FOR DEVICES
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ebx = 13 - videodriver enable
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ecx = 1 - Get DriverInfo and Driver Initial Set
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edx = offset to 512-bytes area for DriverInfo
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RETURN: eax = -1 - errors or driver not installed in system
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eax = 'MDAZ' - driver ID => set information in info area
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Info Structure:
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+0 - Full driver name (ASCII string )
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+32 - Driver version (dword)
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+36 - Reserved
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+64 - List of support videomodes
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(max 32 positions) (word)
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+128 - List of Support vertical rate
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to each present mode (word):
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+0 - 1st ver.rate for mode0
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+2 - 2st ver.rate for mode0
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+4 - 3st ver.rate for mode0
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+8 - 4st ver.rate for mode0
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+10 - 5st ver.rate for mode0
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+12 - 1st ver.rate for mode1
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+14 - 2st ver.rate for mode1
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+16 - 3st ver.rate for mode1
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+18 - 4st ver.rate for mode1
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+20 - 5st ver.rate for mode1
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ecx = 2 - Get Current Video Mode With Vertical Refresh Rate
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RETURN: eax = -1 - errors
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eax = X_screen*65536+Y_screen
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ebx = current vertical rate
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ecx = current video mode (number) [see infostruct]
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ecx = 3 - Change Video Mode
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edx = VertRate*65536+VideoMode [see infostruct]
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RETURN: eax = -1 - errors
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eax = 0 - set new videomode
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ecx = 4 - Return at Start System Video Mode
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RETURN: eax = -1 - errors
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eax = 0 - set initial videomode
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ecx = 5 - Change vertical and horizontal size of visible screen area
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edx = 0/1 - -/+ horizontal size on 1 position
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= 2/3 - -/+ vertical size on 1 position (8 pixels) (not complete yet)
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RETURN: eax = -1 - errors
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eax = 0 - succesfull
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