Short term :
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General
  - Fix init mode (ah=00). Should use more BIOS variables
  - Add new functionalities and modify static functionality table
  - Performance : 16 bits IO

v0.7
  - Implement the remaining functions (don't know if all are needed):
	- chargen ax=1120, ax=1121, ax=1122, ax=1123, ax=1124
	- display switch interface ah=12 bl=35
	- video refresh control ah=12 bl=36
  - Graphic modes

v1.0
  - Bugfixes


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VBE:
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Long term:
- have plex86 host side display interface
- have text io functions in vbe mode