CL-GD5426 with 512K of video memory Windows 3.1 256-color driver installation: Only CL-GD5426 systems with 512K of display memory need to copy the 256_1280.drv file from the \512K directory into the Windows 3.1 SYSTEM sub-directory. CL-GD5428 systems with 512K of video memory will NOT need to copy the 256_1280.drv from the \512K directory.