Editing VESA BIOS Extensions (section)

===Early VBE ===
VBE 1.0 (VS891001) was defined in 1989.<ref>{{Cite web |date=2013-12-11 |title=SUPER VGA BIOS EXTENSION Standard # VS891001 › Gemixtes |url=http://www.gemixtes.de/super-vga-bios-extension-standard-vs891001/ |access-date=2022-12-27 |archive-url=https://web.archive.org/web/20131211151957/http://www.gemixtes.de/super-vga-bios-extension-standard-vs891001/ |archive-date=11 December 2013 }}</ref> VBE 1.1 (VS900602) was defined in 1990. VBE 1.2 (VS911022) was defined in 1991.<ref>{{Cite web |date=October 22, 1991 |title=VBE Version 1.2 |url=http://docs.ruudkoot.nl/vesasp12.txt |access-date=2022-12-27 |archive-url=https://web.archive.org/web/20090114055246/http://docs.ruudkoot.nl/vesasp12.txt |archive-date=14 January 2009 }}</ref> These versions of VBE require real mode to work.

VBE defines several new functions called through [[INT 10H]]. The function numbering start with AX=4F00, or (AH=4F, AL=00), for ''Function 00h''. 00h to 05h were defined in VBE 1.0, 06h and 07h in 1.1, and 08h in 1.2.