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MOS

The metal–oxide–semiconductor (MOS) structure is a foundational semiconductor configuration consisting of a conductive metal gate electrode separated from a semiconductor substrate—typically silicon—by a thin insulating layer of oxide, such as silicon dioxide, which enables control of electrical conductivity through an applied electric field. This architecture forms the basis for metal–oxide–semiconductor field-effect transistors (MOSFETs), the dominant type of transistor in modern integrated circuits due to their scalability, low power consumption, and ability to integrate billions of devices on a single chip. Developed in the early 1960s, MOS technology revolutionized electronics by enabling the production of the first commercial MOS integrated circuits in 1964, which packed more transistors per chip than bipolar alternatives and facilitated advancements like CMOS (complementary MOS) logic for energy-efficient computing. Its defining characteristics include high input impedance, suitability for large-scale integration, and ongoing adaptations to overcome physical limits such as oxide thickness reduction and quantum tunneling effects in sub-nanometer scales. While MOS remains central to microprocessors, memory, and sensors, research continues into alternatives like high-k dielectrics and two-dimensional materials to sustain performance gains amid scaling challenges.

Electronics and Semiconductors

Metal-Oxide-Semiconductor Technology

Metal-oxide-semiconductor (MOS) technology refers to the engineering of layered structures consisting of a metal electrode, an insulating oxide layer (typically silicon dioxide), and a semiconductor substrate, most notably embodied in the metal-oxide-semiconductor field-effect transistor (MOSFET). This configuration enables control of electrical conductivity in the semiconductor via an applied electric field, without physical contact or significant gate current, distinguishing it from bipolar junction transistors that rely on minority carrier injection. The MOSFET's core principle involves depleting or inverting charge carriers in the semiconductor channel beneath the oxide by varying gate voltage, thereby modulating drain-source current for switching or amplification functions. High gate insulation yields input impedances exceeding 10^12 ohms, minimizing power dissipation in logic gates and supporting dense integration. The MOSFET originated from research at Bell Laboratories, where Mohamed M. Atalla developed the critical surface passivation technique using thermally grown silicon dioxide to stabilize silicon interfaces, addressing contamination issues that plagued early field-effect devices. Building on this, Atalla and Dawon Kahng fabricated the first operational MOSFET in late 1959, publicly demonstrated on December 9, 1960, as an n-channel device with a 10-micrometer channel length. Initial prototypes exhibited threshold voltages around 2-4 volts and transconductances suitable for low-power applications, though early yields were low due to process variability. Complementary p-channel variants followed, enabling both NMOS and PMOS fabrication processes by the mid-1960s. MOS technology's scalability stems from its planar geometry, compatible with photolithographic patterning and diffusion doping, which permitted consistent dimensional reduction per rules—halving linear dimensions while quadratically reducing capacitance and linearly cutting power per device. This facilitated counts rising from hundreds in 1960s ICs to billions by the 2010s, underpinning logic where NMOS pull-down and PMOS pull-up s minimize static power. Key enablers included processes introduced in the late 1960s, reducing parasitic capacitances by aligning source/drain implants to the gate edge. The first commercial MOS , a 20-bit , appeared in 1964 from General Microelectronics, marking the shift from dominance in and logic. Applications dominate in (), where one-transistor-one-capacitor cells leverage MOS for storage, achieving densities up to 64 gigabits per chip by 2020 via stacking. In microprocessors, MOS transistors enable clock speeds exceeding 5 GHz with gate lengths below 5 nanometers, though short-channel effects like drain-induced barrier lowering necessitate high-k dielectrics and finFET/ GAA architectures since the to sustain electrostatic control. , with subthreshold swings near 60 mV/decade in ideal operation, supports battery-powered systems, while variability from random fluctuations limits further below 3 nm without novel materials like 2D semiconductors. Despite challenges, MOS variants remain the workhorse of 99% of logic and analog produced annually, totaling trillions of devices.

Computing and Microprocessors

MOS Technology 6502 Microprocessor

The is an 8-bit developed by , Inc., and first shipped to customers in September 1975. Designed primarily by , with contributions from a team including Bill Mensch and Rod Orgill who had previously worked on Motorola's MC6800, the 6502 was engineered as a lower-cost alternative to existing processors by simplifying the architecture while maintaining compatibility with 6800 software through techniques. Its introduction at a price of $25—compared to $175–$300 for competitors like the or —enabled broader adoption in early personal computers and embedded systems by reducing manufacturing costs through fewer transistors and optimized silicon layout. Architecturally, the 6502 features a 16-bit address bus supporting 64 KB of , an 8-bit bus, and seven registers: the accumulator (A), index registers X and Y, (PC), stack pointer (SP), (P), and an unbanked in page 1 of . It employs a variable-length instruction set with 56 instructions (151 opcodes including addressing modes), emphasizing efficiency via zero-page addressing for faster access to the first 256 bytes of and indirect addressing modes that avoid some limitations of contemporaries. The processor uses NMOS technology with approximately 4,500 transistors, 25–40% fewer than rivals, allowing die sizes around two to four times smaller and clock speeds up to 1–2 MHz in early variants like the 6502A. Internal logic pipelines instructions to execute effectively four times per clock cycle despite nominal speeds, prioritizing low power (under 1W) and minimal external components. The 6502 powered numerous seminal systems, including the (1977), (1977), (1977), (1981), and (1985 via a derivative), as well as embedded applications in controllers and appliances. Its variants, such as the 65C02 ( for lower power) and 6510 (with integrated I/O for ), extended its lifecycle into the 1990s, with producing compatible chips into the 21st century for legacy and new embedded designs. The processor's influence stems from its balance of performance, cost, and simplicity, which democratized computing by enabling hobbyist and commercial machines that sold millions of units, though later architectures surpassed it in addressing and speed.

MOS Technology, Inc.

MOS Technology, Inc. was a semiconductor design and manufacturing company specializing in metal-oxide-semiconductor (MOS) integrated circuits, best known for developing the influential 6502 microprocessor. Founded in 1969 in Valley Forge, Pennsylvania, by executives from General Instrument including Mort Jaffe and Don McLaughlin, the company initially focused on producing MOS chips as a second source for Texas Instruments' calculator designs, capitalizing on the growing demand for low-cost electronics components. In 1974, the company recruited a team of eight engineers from , led by and Bill Mensch, who sought to create affordable microprocessors after Motorola declined to pursue low-cost versions of its 6800 processor. This team redesigned the 6800 into the simpler, cheaper 6501 (pin-compatible with the 6800) and 6502 processors, eliminating unnecessary instructions and features to reduce die size and manufacturing costs. The 6502, an 8-bit CPU operating at 1 MHz with a 16-bit address bus, was announced in June 1975 at a price of $25 per unit in volume—far below competitors like Intel's 8080 at $360—sparking legal action from Motorola over alleged , which MOS settled for $200,000. First shipments occurred in September 1975, enabling single-board computers like the released in 1976. The 6502's architecture, emphasizing efficiency with a stack-based interrupt system and zero-page addressing, powered key early personal computers including the (1977), (1977), Atari 400/800 (1979), and later the (1982), with over 40 million units produced across variants like the 65C02. MOS also developed supporting chips such as the 6530 RRIOT (RAM/ROM I/O timer) and, post-acquisition, video and sound ICs like the VIC-II and for Commodore systems. Facing financial pressures, MOS was acquired by in September 1976 for approximately $12 million in stock, integrating it as a that continued chip production until Commodore's 1994 bankruptcy; operations effectively ceased around 2001. The company's innovations democratized by prioritizing cost and performance, influencing the home computer revolution despite limited internal resources and reliance on techniques like "mask fixing" for yield improvements.

Military and Defense

Military Occupational Specialty

A Military Occupational Specialty (MOS) designates a specific job role or career field assigned to enlisted personnel and officers in the United States Army and , categorizing duties essential to military operations across combat, support, and administrative functions. Unlike the Navy's or the Air Force's (AFSC), MOS emphasizes specialized training tailored to branch-specific missions, with assignments determined by individual qualifications, service needs, and available billets shortly after enlistment or basic training. In the Marine Corps, over 300 exist, grouped into broad occupational fields such as personnel and (e.g., requiring clerical and communication skills), , , , and communications; each Marine receives via formal schools, on-the-job instruction, or advanced programs post-recruit training to achieve proficiency. The Army employs a similar structure with approximately 160 enlisted MOSs for active-duty roles, using a three-digit code for enlisted personnel where the first two digits identify the career management field (e.g., 11 for ) and the third specifies the specialty (e.g., for infantryman). Marine Corps MOS codes typically feature four digits for enlisted roles (e.g., 0311 for rifleman in the field), reflecting primary duties while allowing secondary or billet-specific designations. MOS assignments prioritize force balance, with reclassification possible—termed "reclassification" in the and —upon approval from the chain of command, often during reenlistment or to address overstaffing in one specialty and shortages in another, though such changes demand additional training due to prior investments in initial roles. The system traces its origins to World War II-era codes in the , which expanded from basic numerical identifiers for roles like or to manage wartime , later formalizing into alphanumeric structures by the mid-20th century to handle growing operational complexity. Official manuals, such as the Marine Corps' NAVMC 1200 series, synchronize MOS inventories with tables of organization to generate authorized strength reports and align personnel with unit requirements.

Publishing and Media

Manual of Style

A manual of style, also known as a , establishes standards for writing, editing, formatting, and design in documents to ensure consistency, clarity, and professionalism across publications. These guides specify rules for , , , abbreviations, citations, and visual elements such as and headings, adapting to the needs of specific fields like book publishing, , or . Originating in the late 19th and early 20th centuries amid growing print media demands, manuals of style addressed variations in English usage to streamline production and enhance for diverse audiences. In and , the primary purpose of a manual of style is to standardize , reducing errors and aligning outputs with an organization's voice or norms, which facilitates among writers, editors, and designers. For instance, they dictate preferences for serial commas, date formats (e.g., month-day-year versus day-month-year), and handling of numbers (e.g., spelling out below ten or using numerals for all), preventing inconsistencies that could confuse readers or undermine credibility. In , adherence to such guides accelerates workflows and maintains in by enforcing uniform , while in , they guide preparation from submission to final . This consistency is particularly vital in large-scale operations, where multiple contributors produce content under tight deadlines, as divergent styles can lead to fragmented reader experiences or legal issues in accuracy. Prominent examples include (CMOS), first published in 1906 by the and now in its 18th edition, which serves as a comprehensive reference for trade and academic books, emphasizing detailed documentation systems like footnotes and bibliographies. Widely called the "editor's bible," CMOS covers over 1,000 pages on topics from hyphenation to indexing, influencing U.S. standards and evolving through periodic updates to reflect linguistic shifts, such as digital formatting in its online edition. In media, the Associated Press Stylebook, updated annually since 1953, prioritizes brevity and factual precision for news wires, broadcast, and online , with rules favoring , avoiding , and standardizing terms like "percent" over "%" in most contexts. Other sector-specific guides, such as in-house manuals from publishers like or media outlets like , build on these foundations to enforce brand-specific preferences, ensuring outputs remain authoritative and adaptable to evolving technologies like . While manuals of style promote uniformity, they are not immutable; updates respond to cultural, technological, and empirical feedback, such as CMOS's expansions on or in recent editions, though core principles prioritize evidence-based conventions over transient trends. Their importance lies in fostering trust: inconsistent styling can signal sloppiness, eroding audience engagement, whereas rigorous application enhances and preserves institutional in competitive media landscapes. Organizations without tailored guides often adopt hybrids, weighing trade-offs like CMOS's thoroughness against AP's conciseness for efficiency.

Other Uses

Filmmaking Terminology

In filmmaking, MOS refers to captured without synchronized sound recording, allowing directors to prioritize visual elements while planning for audio to be added in . The term is typically marked on the slate during to alert editors and sound teams that no usable audio accompanies the take. This enables efficient shooting of establishing shots, action sequences, or inserts where ambient noise or dialogue synchronization might complicate on-set recording. The acronym MOS is widely attributed to "Mit Out Sound," a phonetic rendering of the German phrase "mit ohne Sound" (without sound), originating from early 20th-century Hollywood where German émigré directors and technicians, such as those fleeing post-World War I , adapted their to English workflows. Alternative etymologies, including "Minus Optical Sound" or "Mute Optical Sound," have been proposed to reference the absence of an optical audio track on prints, but these lack primary historical documentation and are less supported by lore. By the 1930s, MOS had become standard jargon in American studios, as evidenced in logs from major films like those from and , where silent takes reduced setup time for noisy scenes. Practical advantages of MOS shots include faster turnaround times—often saving 10-20 minutes per setup by bypassing sound checks and blimps—and mitigation of interference, such as wind or traffic, which plagued early location shoots before advanced microphones in the . However, drawbacks arise if incidental proves valuable, requiring costly reshoots or (automated dialogue replacement), which can alter vocal and increase budgets by up to 15% for dialogue-heavy films, per analyses. In modern digital workflows, MOS remains relevant for integration or libraries, where over 40% of cinematic is sourced silently to allow flexible . Directors like frequently employed MOS for suspense builds, layering foley and scores post-capture to heighten tension without on-set constraints.

Geographical Locations

Mos is a municipality in the province of Pontevedra, , in northwestern , situated adjacent to the city of . Covering an area of approximately 53 km², it features a dispersed rural centered on family-owned farms and vineyards rather than a prominent urban core. As of recent data, the stands at 15,078 residents, yielding a density of 283.4 inhabitants per km². The Louro River flows through the municipality from north to south, shaping its topography and supporting agricultural activities. Geographically, Mos lies at the intersection of routes connecting and the nearby industrial area of , positioning it along the Camino Portugués pilgrimage path, which draws pilgrims and tourists to sites like the historic Pazo de Mos . The region exemplifies Galicia's verdant, riverine landscape, with elevations varying modestly and soils suited to .

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