Ver 0.01.5
	- Programed PIT before PIC, this seemed to solve a crash on some PCs
	- Code produces a 360kb fdd image as VM-ware EMU crashed with 512b images
	- Re-wrote PIT code to work with the 8253 & 8253 instead of just 8254s.
	- Removed seprate EBP backup during task switch. 
Ver 0.01
	- Programs the PIT at 100Hz (instead of BIOS default)
	- Added screen text 'scrolling'.
	- Now uses 80*50 text mode instead of BIOS default (80*25).
Ver 0.00
	first demo release. Contains some buggy task switching.