MEM C000h:xxxxh - VESA(Video Electronics Standards Association) An industry group which sets both hardware and software standards and recommendations. The term VESA is also used to denote compliance with the VESA SuperVGA BIOS Extensions, a standard set of video BIOS functions for accessing video modes of higher resolution than those defined by IBMInternational Busiuness Machines. VBE(VESA BIOS Extensions) The common software interface for video cards providing support for high resolution and bit depth. v3.0 PROTECTED MODE INFORMATION BLOCK Size: 20 BYTEs Range: starting at any byte within the first 32K of segment C000h Format of VESA(Video Electronics Standards Association) An industry group which sets both hardware and software standards and recommendations. The term VESA is also used to denote compliance with the VESA SuperVGA BIOS Extensions, a standard set of video BIOS functions for accessing video modes of higher resolution than those defined by IBMInternational Busiuness Machines. VBE(VESA BIOS Extensions) The common software interface for video cards providing support for high resolution and bit depth. 3.0 Protected ModeOne of the operating modes of the 80286 and higher Intel processors, in which addresses used by programs no longer correspond to physical addresses and the CPU enforces various protection mechanisms designed to prevent one program from disrupting other programs or the operating system. See also Real Mode, Virtual-86 Mode. Information Block: Offset Size Description (Table M0127) 00h 4 BYTEs signature "PMID" 04h WORD offset of protected-mode entry point within BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. 06h WORD offset of protected-mode initialization entry point 08h WORD selector for BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. data area emulation block (default 0000h, must be set by protected-mode OS to 16-bit read/write data selector with limit of at least 0600h) 0Ah WORD selector to access physical memory at A0000h (default A000h, must be set by protected-mode OS to 16-bit read/write data selector with 64K limit) 0Ch WORD selector to access physical memory at B0000h (default B000h, must be set by protected-mode OS to 16-bit read/write data selector with 64K limit) 0Eh WORD selector to access physical memory at B8000h (default B800h, must be set by protected-mode OS to 16-bit read/write data selector with 32K limit) 10h BYTE protected-mode execution (default 00h; set to 01h by OS when BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. image is running in protected mode) 11h BYTE checksum byte for entire structure (this byte forces 8-bit sum of all bytes to 00h)