5 - Fix init mode (ah=00). Should use more BIOS variables
6 - Add new functionalities and modify static functionality table
7 - Performance : 16 bits IO
10 - Implement the remaining functions (don't know if all are needed):
11 - chargen ax=1120, ax=1121, ax=1122, ax=1123, ax=1124
12 - display switch interface ah=12 bl=35
13 - video refresh control ah=12 bl=36
20 =================================================================================================
24 - have plex86 host side display interface
25 - have text io functions in vbe mode