was the first racing game to feature a third-person rear view format, and use sprite scaling with full-colour graphics. Namco's Pole Position featured an improved rear-view racer format in 1982 that remained the standard for the genre; the game provided a perspective view of the track, with its vanishing point swaying side to side as the player approaches corners, accurately simulating forward movement into the distance. That same year, Sega released Zaxxon, which introduced the use of isometric graphics and shadows; and SubRoc-3D, which introduced the use of stereoscopic 3D through a special eyepiece; This period also saw significant advances in digital audio technology. Space Invaders in 1978 was the first game to use a continuous background soundtrack, with four simple chromatic descending bass notes repeating in a loop, though it was dynamic and changed tempo during stages. Rally-X in 1980 was the first game to feature continuous background music, which was generated using a dedicated sound chip, a Namco 3-channel PSG. That same year saw the introduction of speech synthesis, which was first used in Stratovox, released by Sun Electronics in 1980, followed soon after by Namco's King & Balloon. Developers also experimented with laserdisc players for delivering full motion video based games with movie-quality animation. The first laserdisc video game to exploit this technology was 1983's Astron Belt from Sega, soon followed by Dragon's Lair from Cinematronics; the latter was a sensation when it was released (and, in fact, the laserdisc players in many machines broke due to overuse). While laserdisc games were usually either shooter games with full-motion video backdrops like Astron Belt or interactive movies like Dragon's Lair, Data East's 1983 game Bega's Battle introduced a new form of video game storytelling: using brief full-motion video cutscenes to develop a story between the game's shooting stages, which years later became the standard approach to video game storytelling. By the mid-1980s, the genre dwindled in popularity, as laserdiscs were losing out to the VHS format and the laserdisc games themselves were losing their novelty. 16-bit processors began appearing in several arcade games during this era. Universal's Get A Way (1978) was a sit-down racing game that used a 16-bit CPU, for which it was advertised as the first game to use a 16-bit microcomputer. Another racing game, Namco's Pole Position (1982), used the 16-bit Zilog Z8000 processor. Atari's Food Fight (1983) was one of the earliest games