History of Revisions for Memory Game for OS/2 5-25-97 Version 1.0: Initial Release. 5-29-97 Version 1.1: Added support for 640x480 and 800x600 (initially designed to support 1024x768 only). Added VPOBJ.DLL to archive to prevent "VPIBUTTN.DLL" error messages from appearing while starting the game or selecting GAME - Options or GAME - New.