Specifications

194 AMD Geode™ GeodeROM Functional Specification
Video BIOS Support
32087C
13.2.2 Function 01h: Return VBE Mode Information
Description:
Returns information about the specified video mode. The information is stored in the VBEModeInfoBlock data struc-
ture.
Passed:
Returns:
13.2.3 Function 02h: Set VBE Mode
Description:
Sets an extended video mode. If bit 14 is set, then the frame buffer is set to the physical address specified by the Phys-
BasePtr field of the VBEModeInfoBlock data structure returned by VBE Function 01h. If bit 15 is set, then the mode is
set, but video memory is not cleared. For text modes, a font will still be loaded.
Note: If the function is not supported with the current hardware, then the mode is not set and AH is set to 01h on exit.
(see the ModeAttributes field of the VBEModeInfoBlock data structure returned by VBE Function 01h).
Passed:
Returns:
13.2.4 Function 03h: Get VBE Mode
Description:
Returns the current video mode. See Function 02h: Set VBE Mode for a description of bits 14 and bit 15.
Passed:
Parameter Description
AH 4Fh
AL 01h
CX Mode number
ES:DI Pointer to 256-byte buffer
Parameter Description
AX VBE return status
Parameter Description
AH 4Fh
AL 02h
BX Mode:
Bits[13:0] = Mode number
Bit[14] = Linear frame buffer flag
Bit[15] = Don’t clear memory flag
Parameter Description
AX VBE return status
Parameter Description
AH 4Fh
AL 03h