Original sentence: Another 4 KB of vector ROM contain the descriptions of the main graphical elements (rocks, saucer, player's ship, explosion pictures, letters, and digits) in the form of DVG commands.Asteroids also features various sound effects, each of which is implemented by its own circuitry.The Asteroids arcade machine is a vector game.The hardware consists of a standard MOS 6502 CPU, which executes the game program, and the Digital Vector Generator (DVG), vector processing circuitry developed by Atari.The inputs from the player's controls (buttons) are also mapped into the CPU address space.The main Asteroids CPU uses only 4 KB of ROM code.This means that the game graphics are composed entirely of lines which are drawn on a vector monitor
Edited sentence: Another four kibibytes of vector ROM contain the descriptions of the main graphical elements (rocks, saucer, player's ship, explosion pictures, letters, and digits) in the form of DVG commands.Asteroids also has some cool sound effects, each of which is implemented by its own circuitry.The Asteroids arcade machine is a so-called vector game.The Asteroids game program uses only four kibibytes of ROM.The hardware essentially consists of a standard 6502 CPU, which executes the game program, and of the Digital Vector Generator (DVG), vector processing circuitry developed by Atari.The inputs from the player's controls (buttons) are also made available to the CPU on such memory mapped ports.This means that the game graphics are only made up of lines which are drawn on a vector monitor