This is a YAMAHA SY77. Equipped with an AWM sound source, it's packed with sounds that are still perfectly usable today, from delicate tones to powerful ones. The floppy drive and WAVEFORM card are missing, but otherwise, I've confirmed that the basic functions are working. The card slot and floppy drive are not guaranteed. Also, I haven't checked all functions. All keys produce sound. The keyboard is in good working order. The LCD backlight is off, but the contrast is adjustable, and the display is clear and normal. Pitch bend is normal. All buttons have been confirmed to work. Outputs 1 and 2 are normal, and there is no scratchiness in the volume. There were no battery errors at startup. The above checks are based on the current condition. Thank you. Please understand that this is an old item, and there is no warranty. I have cleaned it, but there are some dirt and scratches. Please check the photos. It is generally in good condition, but I will have to decline if you are overly concerned about minor details. I will ship it quickly with air padding and corrugated cardboard. Thank you.