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AH = FEh ES:DI -> assumed video buffer B800h:0000h color text/CGA graphics, B000h:0000h mono text, or A000h:0000h EGA/VGA graphics (RSIS environments only)
Return:
ES:DI -> actual video buffer for calling process
Desc: Determine the address of the virtual screen to which the program should write instead of the actual video memory; this permits programs to be multitasked without interfering with each other's output, and allows memory managers to move the video memory to permit larger programs to be loaded.
Notes: If no multitasker or RSIS-compliant environment is installed, ES:DI is returned unchanged; RSIS is the Relocated Screen Interface Specification. For display pages other than 0, use AH=05h and AH=0Fh to determine whether a particular page exists. TopView requires a call to AH=FFh to notify it that the screen has changed; DESQview will check for changes itself until the first call to AH=FFh
See Also: AH=05h - AX=5201h - AH=FFh - INT 15/AX=1024hSee Also: INT 21/AH=ECh"DoubleDOS"
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