Pertinent Pertinent was an Australian monthly periodical edited by Leon Batt. Contributors included Ian Mudie, Kylie Tennant, William Hart-Smith, the artist Rosaleen Norton and the poet Gavin Greenlees, Dulcie Deamer, Yvonne Webb, George Farwell, Marjorie Quinn, Marien Dreyer, and Robert Crossland Started in 1940 the magazine ceased publication in 1947.
Part of the Microprocessors glossary: Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses. Many TTL logic gate s are typically fabricated onto a single integrated circuit (IC).
A-TTL is an initialism that stands for Advanced-Through The Lens flash metering. As with ordinary TTL flash exposure systems, a sensor inside the camera reads the amount of light being reflected off the film during the exposure. When the sensor determines that the exposure is sufficient, it terminates the flash pulse. A-TTL, first seen on the T90 (which predates the EOS family), is a flash exposure system that adds a brief preflash during exposure metering when the camera is in the programmed exposure (P) mode.