From Sega Retro
Zektor is a shoot-'em-up arcade game developed for vector-based Sega G80 hardware.
Zektor is very similar to Atari's Asteriods, in the you pilot a starship which can move in any direction on screen, avoiding obstacles while firing at enemies. Unlike Astroids the aim of the game is simply to destroy enemies, which enter the arena from the top of the screen in waves. The game also makes heavy use of synthesized speech. The chipset and technique used for the speech synthesis in Zektor was also used in a number of other notable G80-driven SEGA arcade titles.
The game was not ported to any home platforms, though was eventually included as part of Sega Mega Drive Collection.