Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

                                                     ◄Up► ◄Next► ◄Previous►
────────────────────────────────────────────────────────────────────────────
 
mov ax, 4006h   ; Restore Video Register State
int 2fh
 
Restore Video Register State notifies a VM application that the
virtual-display device (VDD) has relinquished its access to the video
registers. The VM application should restore the video registers to any
state necessary to continue uninterrupted foreground operation.
 
Return Value
 
This function has no return value.
 
Comments
 
The VDD calls this function only if the VM application has called Enable
VM-Assisted Save/Restore (Interrupt 2Fh Function 4000h). Before calling this
function, the VDD restores any registers it modified to the values they had
when the VM application originally called Enable VM-Assisted Save/Restore.
In other words, every register is guaranteed to be either unchanged or reset
to a previous state; precisely which registers may be reset is undefined,
but the set is restricted to those Sequencer and Graphics Controller
registers that do not affect the display.
 
 
                                      ♦