Beyond arcade games, significant improvements to personal computer game music were made possible with the introduction of digital FM synth boards, which Yamaha released for Japanese computers such as the NEC PC-8801 and PC-9801 in the early 1980s, and by the mid-1980s, the PC-8801 and FM-7 had built-in FM sound. This allowed computer game music to have greater complexity than the simplistic beeps from internal speakers. These FM synth boards produced a "warm and pleasant sound" that musicians such as Yuzo Koshiro and Takeshi Abo utilized to produce music that is still highly regarded within the chiptune community. The widespread adoption of FM synthesis by consoles would later be one of the major advances of the 16-bit era, by which time 16-bit arcade machines were using multiple FM synthesis chips.