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Call EDOS entry point with

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AX =
0000h get EDOS version number
Return: AH = major version
AL = minor version
0001h display message
Data: CX = 0
0002h get EDOS error coded
Return: EAX = time in milliseconds that Windows has been running
0003h execute windows program
Return: EAX = cumulative amount of time the virtual machine has been active, in milliseconds
0008h get/set priority
Data: BX =
0000h??? = foreground
0001h = background
DI =
0000h = get
0001h = set
DX = priority setting
Return: CX = foreground priority
DX =  background priority
BX:AX = flags
00000001h = exclusive ON
00000010h = background ON
SI = CPU percentage