The video miniport driver for VirtualBox has been updated. The miniport now supports a much broader range of resolutions, up to 1920×1200. Color depths of 32, 24, 16, 15, and 8 bits per pixel are supported for all resolutions, although Windows typically filters out some of those.
The above screenshot shows Windows NT 3.50 running in 1680×1050 resolution (16:10 aspect ratio), providing an impressive amount of screen real estate.
The list of supported resolutions now includes many common resolutions with 4:3, 16:10, and 16:9 aspect ratios. Only modes with square pixels are supported; for that reason, 1280×1024 (5:4 aspect ratio) is not on the list. The 1080p full HD resolution (1920×1080) is now supported.
Most users should now be able to find a convenient display resolution which either fills the entire screen in full-screen mode or is just large enough to fit without scrolling when the VM runs in windowed mode.
The list of modes is now checked against the size of video memory assigned to a VM. For VRAM sizes of 8MB or less, some high resolution, high color depth modes will be unavailable.
Note that unlike all later versions, Windows NT 3.1 does not dynamically query available modes and is limited to modes explicitly listed in OEMSETUP.INF. The list currently includes 640×480, 800×600, 1024×768, and 1152×864 resolutions.
The installation procedure is unchanged since the earlier release; a floppy image is provided for easy installation. For NT 3.x, the appropriate FRAMEBUF.DLL (either compressed or uncompressed) must be copied onto the installation floppy image before installing or updating the miniport driver.