KURZWEIL OS 3.87J Software Eproms - Janis K2000 K2000S K2000R K2000RS K2VP K2VX

OS 3.87J Eproms . When you upgrade the OS, you must install the correct software. If there is a "J" after the version number in the display, you have a Janis unit, and need OS 3.87J Eproms. If there is no letter after the version number, you have a Calvin unit, and need OS 3.87 Eproms.