Int 21/AH=ECh

DoubleDOS - GET VIRTUAL SCREEN ADDRESS

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"

Category: DOS-Based Task Switchers/Multitaskers - Int 21h - D

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