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Int 21 Fn EC - Doubledos - Get Virtual Screen Address [T]
AH = ECh
Return: ES = segment of virtual screen
Desc: determine the address of the virtual screen to which the program
should write instead of the actual video memory, so that the
multitasked programs do not interfere with each other's output
Notes: screen address can change if task-switching is on!!
identical to AH=FCh
See Also: INT 10/AH=FEh,AH=FCh"DoubleDOS",INT FC"DoubleDOS"
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