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The base model X1 Carbon has a 14-inch (360 mm) TN screen with a resolution of 1600 by 900 pixels. The X1 Carbon weighs 1.35 kilograms (3.0 lb) and measures 12.8 inches (330 mm) by 8.94 inches (227 mm) by 0.68 inches (17 mm) (at its thickest). The X1 Carbon's roll cage is made of light-weight carbon-fiber [17] and has a matte black finish. [15]
The X1 Carbon weighs 1.35 kg (3.0 lb), has a battery life of roughly eight hours, and has a start-up time of less than 20 seconds. The X1 Carbon was first released in China because of the popularity of ThinkPads in that market. [65] The first X1 Carbon featured only an M.2 SSD instead of a 2.5" hard drive bay.
When the battery fails, BIOS settings are reset to their defaults. The battery can also be used to power a real time clock (RTC) and the RTC, NVRAM and battery may be integrated into a single component. The name CMOS memory comes from the technology used to make the memory, which is easier to say than NVRAM. [3]
A six-transistor (6T) CMOS SRAM cell. WL: word line. BL: bit line. A typical SRAM cell is made up of six MOSFETs, and is often called a 6T SRAM cell. Each bit in the cell is stored on four transistors (M1, M2, M3, M4) that form two cross-coupled inverters. This storage cell has two stable states which are used to denote 0 and 1.
The C840 was the last Dell notebook (along with its sister models the Inspiron 8200 and Precision M50) to have both a fixed optical drive and a modular bay, making it a "three-spindle" (or "tri-spindle") notebook. The modular bay could also be used for a second battery identical to the primary battery, rather than a special modular bay battery.
[citation needed] In 1985, Philips inventors Theodorus Welzen and Adrianus de Vaan solved the problem of driving high-resolution STN-LCDs using low-voltage (CMOS-based) drive electronics, allowing the application of high-quality (high resolution and video speed) LCD panels in battery-operated portable products like notebook computers and mobile ...