The keyboard was recently serviced and the main power supply was exchanged for a new one. The new power supply makes less heat and increases the durability of the unit. During the service, I asked them to install the additional SCSI board and added 16mb (MAX) ram. The whole operation cost me north of $500. Right now the unit is in flawless condition and ready to be used. The auction includes an expensive keyboard case and the keyboard will be shipped with the heavy duty keyboard case ensuring transport safety. I will include both the 1.61 OS and 3.53 OS. I am selling the Keyboard because It takes a lot of space in my studio and I recently got the ASR-10 rack version which solves all of my problems. You are purchasing a quality, taken-care of ASR-10 sampler that will ensure no hassle of operation upon arrival. Let me know if you have any questions