Initially sold for ¥49,000
Alternative keyboard for the YIS ecosystem, with chiclet style switches. Compared to the KB1, which had mechanical switches, the bottom row where the spacebar should sit, is occupied by four keys, with likely the two middle ones triggering the space. The layout is also very different from the subsequent chiclet keyboards made by Yamaha, such as the one found on the CX5. Only one black and white picture of the object survives, which seems to suggest the keys didn't have much travel and had a reflective surface.