| Subject | English | Portuguese |
| el. | inverted clock-pulse system | sistema de impulsos de tempo invertidos |
| el. | system clock | relógio do sistema |
| comp., MS, Braz. | system clock | relógio do sistema (The electronic circuit in a computer that generates a steady stream of timing pulses--the digital signals that synchronize every operation. The system clock signal is precisely set by a quartz crystal, typically at a specific frequency between 1 and 50 megahertz. The clock rate of a computer is one of the prime determinants of its overall processing speed, and it can go as high as the other components of the computer allow) |