INT 21 - DoubleDOS - GET VIRTUAL SCREEN ADDRESS AH = FCh 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=ECh SeeAlso: AH=ECh"DoubleDOS",INT FC"DoubleDOS"
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