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American computer company, 1969 to 1982
Four-Phase Systems, Inc. was a computer company, founded by Lee Boysel and others, which built one of the earliest computers using semiconductor main memory
Four-Phase_Systems
8-bit microprocessor
microprocessor slice designed by Four-Phase Systems and unveiled in February 1970. The chip was first used as part of Four-Phase's System IV/70 24-bit minicomputer
Four-Phase_Systems_AL1
Form of alternating current
arrangement produces a more constant flow of power compared with single-phase systems, making it especially efficient for transmitting electricity over long
Three-phase_electric_power
"Use four-phase MOS IC logic" in Electronic Design magazine. In the same year, Cohen, Rubenstein, and Wanlass published "MTOS four phase clock systems".
Four-phase_logic
Computer processor contained on an integrated-circuit chip
1969 Busicom design). Arguably, Four-Phase Systems AL1 microprocessor was also delivered in 1969. The Four-Phase Systems AL1 was an 8-bit bit slice chip
Microprocessor
Topics referred to by the same term
research Phase 4 Films, a Canadian film distribution company Phase 4 Stereo, record label and recording process Four-Phase Systems, a computer company Four-phase
Phase_4
American electrical engineer and entrepreneur
Fairchild 3800 / 3804 8-bit ALUs. Boysel designed the Four-Phase Systems AL1. He founded Four-Phase Systems to commercialize the technology, and sold the company
Lee_Boysel
Former American computer company
resold by other manufacturers such as ADP, AT&T, Burroughs/Unisys, Four-Phase Systems, Gould Electronics, Mohawk Data Sciences, NCR, and Prime Computer
Convergent_Technologies
Means of distributing alternating-current electrical power
conductor. Early systems used 4 wire two-phase with a 90° phase angle, but modern systems almost universally use three-phase voltage, with a phase angle of 120°
Polyphase_system
Computer system with a dedicated function
computer processor system could be contained on several MOS LSI chips. The first multi-chip microprocessors, the Four-Phase Systems AL1 in 1969 and the
Embedded_system
Football tournament qualification stage
qualifying phase and play-off round began on 9 July and will end on 27 August 2026. A total of 52 teams are competing in the qualifying system, which includes
2026–27 UEFA Europa League qualifying
2026–27_UEFA_Europa_League_qualifying
English association football leagues
League System, see the English football league system. The system underwent a rearrangement from 2004 to 2008 and was rearranged again in 2018. Phase one
National_League_System
Electric power distribution system
two-phase machines. Three-phase systems eventually replaced the original two-phase power systems for power transmission and utilization. Active two-phase
Two-phase_electric_power
Former corporate headquarters of Apple Inc. in California, U.S.
to the construction of the Apple campus, the land was occupied by Four-Phase Systems, later acquired by Motorola. Apple purchased the campus from Motorola
Apple_Infinite_Loop_campus
Topics referred to by the same term
Trochlear nerve, the fourth cranial nerve 4 (number) in Roman numerals Four-Phase Systems, a computer company whose logo was a stylized "IV" International Viewpoint
IV
Development phases of a computer-based system
systems development life cycle (SDLC) describes the typical phases and progression between phases during the development of a computer-based system.
Systems development life cycle
Systems_development_life_cycle
single MOS LSI chip. The earliest multi-chip microprocessors were the Four-Phase Systems AL1 in 1969 and Garrett AiResearch MP944 in 1970, each using several
History of computing hardware (1960s–present)
History_of_computing_hardware_(1960s–present)
Topics referred to by the same term
AL1 may refer to: Four-Phase Systems AL1, 8-bit integrated circuit of an arithmetic logic unit and registers made by Four-Phase Systems in 1969 AL1, original
AL1
Digital camera design standard
Contrast-detection autofocus systems such as those used in Micro Four Thirds cameras were initially slower than the phase-detection systems used in DSLRs. Note
Micro_Four_Thirds_system
Computer architecture bit width
24 bits is −8,388,608 to 8,388,607. The IV/70, was introduced by Four-Phase Systems in 1971. The IV/70 has an integer word size of 24 bits. Byte addressing
24-bit_computing
2016–2019 group of superhero films
Phase Three of the Marvel Cinematic Universe (MCU) is a group of American superhero films produced by Marvel Studios based on characters that appear in
Marvel Cinematic Universe: Phase Three
Marvel_Cinematic_Universe:_Phase_Three
Qualification phase of the 2026–27 UEFA Conference League
qualifying phase and play-off round began on 7 July and will end on 27 August 2026. A total of 153 teams compete in the qualifying system of the 2026–27
2026–27 UEFA Conference League qualifying
2026–27_UEFA_Conference_League_qualifying
2008–2012 group of superhero films
Phase One of the Marvel Cinematic Universe (MCU) is a group of American superhero films produced by Marvel Studios based on characters that appear in
Marvel Cinematic Universe: Phase One
Marvel_Cinematic_Universe:_Phase_One
Football tournament qualification stage
qualifying phase and play-off round began on 7 July and will end on 26 August 2026. A total of 52 teams are competing in the qualifying system of the 2026–27
2026–27 UEFA Champions League qualifying
2026–27_UEFA_Champions_League_qualifying
IDE software developed by Softlab Munich
prototype of the system, then named PET, in 1974, based on the Philips X1150 data collection system, originally a Four-Phase Systems IV/70 from the USA
Maestro_I
Digital camera design standard
under a non-disclosure agreement. Unlike older single-lens reflex (SLR) systems, Four Thirds was designed from the start for digital cameras. Many lenses
Four_Thirds_system
Physical process of transition between basic states of matter
trees, and grassy plants. Phase transitions have been hypothesised to occur in social systems viewed as dynamical systems. A hypothesis proposed in the
Phase_transition
Array of antennas creating a steerable beam
operating wavelengths are conveniently small. Phased arrays were originally invented for use in military radar systems, to detect fast moving planes and missiles
Phased_array
Four-stage model of physiological responses to sexual stimulation
sexual response cycle model. The excitement phase (also known as the arousal phase or initial excitement phase) is the first stage of the human sexual response
Human_sexual_response_cycle
Type of single-phase electric power distribution
A split-phase or single-phase three-wire system is a form of single-phase electric power distribution. It is the alternating current (AC) equivalent of
Split-phase_electric_power
Phenomenon in nonlinear optics
intercept point in electrical systems. Four-wave mixing can be compared to the intermodulation distortion in standard electrical systems. It is a parametric nonlinear
Four-wave_mixing
Shape of the Moon's sunlit portion as viewed from Earth
cycle of phases takes one lunar month and moves across the same side of the Moon, which always faces Earth. In common usage, the four major phases are the
Lunar_phase
Season of UEFA's top-tier European club football competition
will automatically qualify for the 2027–28 UEFA Champions League league phase, the 2027 FIFA Intercontinental Cup final, the 2029 FIFA Club World Cup
2026–27_UEFA_Champions_League
Timeline of microprocessors
slice arithmetic logic unit with registers. Four-Phase did not sell the AL1 individually but as part of a system combining three of these 8-bit AL1 chips
Microprocessor_chronology
American superhero media franchise
Widow (2021) is the first film in Phase Four, which concluded with Black Panther: Wakanda Forever (2022), while Phase Five began with Ant-Man and the Wasp:
Marvel_Cinematic_Universe
Electronic control system
A phase-locked loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the
Phase-locked_loop
2025 Marvel Studios film
and May 2, 2025. It is the first film, and start, of Phase Six of the MCU. The Fantastic Four: First Steps was released for digital download on September
The Fantastic Four: First Steps
The_Fantastic_Four:_First_Steps
Mathematics and basic principles of three-phase electric power
In electrical engineering, three-phase electric power systems have at least three conductors carrying alternating voltages that are offset in time by one-third
Mathematics of three-phase electric power
Mathematics_of_three-phase_electric_power
Early warning radar
PAVE PAWS (PAVE Phased Array Warning System) is a complex Cold War early warning radar and computer system developed in 1980 to "detect and characterize
PAVE_PAWS
Electrical circuit detecting phase difference
motor control, radar and telecommunication systems, servo mechanisms, and demodulators. Phase detectors for phase-locked loop circuits may be classified in
Phase_detector
is divided into three phases of digestion known as the cephalic phase, the gastric phase, and the intestinal phase. These phases overlap and all three
Phases_of_digestion
Limiting set in dynamical systems
is the entire phase space. Equations or systems that are nonlinear can give rise to a richer variety of behavior than can linear systems. One example is
Attractor
International football club competition in Europe
represented in the league phase. Poland was the first country to have four clubs play in the Conference League group stage/league phase, and it was also the
2025–26 UEFA Conference League league phase
2025–26_UEFA_Conference_League_league_phase
Final stage of electricity delivery to individual consumers in a power grid
(three-phase equipment). In North America, overhead distribution systems may be three phase, four wire, with a neutral conductor. Rural distribution system may
Electric_power_distribution
Mixture with a lower melting point than its constituents
mixing ratios of the constituents is called the eutectic temperature. On a phase diagram, the eutectic temperature is seen as the eutectic point (see plot)
Eutectic_system
Railway electrification system
motors and their control systems avoid the fixed speeds of traditional systems, as they are built with solid-state converters. The four current such railways
Three-phase AC railway electrification
Three-phase_AC_railway_electrification
Automatic circuit protection device
This is a very common requirement for three-phase systems, where breaking may be either three- or four-pole (solid or switched neutral). Some makers
Circuit_breaker
Process where information about current status is used to influence future status
space of a system. The term bipolar feedback has been coined to refer to biological systems where positive and negative feedback systems can interact
Feedback
Rapid transit system in India serving Delhi NCR
December 2004. The network was developed in phases. Phase I was completed by 2006, followed by Phase II in 2011. Phase III was mostly complete by 2021, except
Delhi_Metro
Under-construction passenger rail system in the US
authorized by a 2008 statewide ballot, and is being constructed in two major phases. Phase 1, which is about 494 miles (795 km) long, will connect the Bay Area
California_High-Speed_Rail
Set of telecommunications standards
standard. (Phase I radios cannot operate on Phase II trunked systems. However, Phase II radios can operate on Phase I systems or conventional systems.) The
Project_25
General principle in thermodynamics regarding pVT systems in equilibrium
thermodynamics, the phase rule is a general principle governing multi-component, multi-phase systems in thermodynamic equilibrium. For a system without chemical
Phase_rule
Planned rapid transit system
Baoji rapid transit system is a rapid transit system in the planning phase in Baoji, Shaanxi, China. It is planned as a monorail with four lines. So far, there
Baoji_rapid_transit_system
European association football tournament
teams enter the league phase, joining 29 teams qualified in advance. The 36 teams each play eight opponents, four home and four away. The 24 highest-ranked
UEFA_Champions_League
American surface-to-air missile family
MTI (Moving Target Indicator). The first PIP Phase I systems were fielded between 1979 and 1981. Phase II Developed from 1978 and fielded between 1983
MIM-23_Hawk
Systems to distribute electricity
world. Specialized power systems that do not always rely upon three-phase AC power are found in aircraft, electric rail systems, ocean liners, submarines
Electric_power_system
electronics to convert these supplies to run three-phase AC traction motors. Tram electrification systems are listed here. Volts: voltage or volt Current:
List of railway electrification systems
List_of_railway_electrification_systems
Type of data encoding
"binary phase-shift keying" (BPSK) which uses two phases, and "quadrature phase-shift keying" (QPSK) which uses four phases, although any number of phases may
Phase-shift_keying
South Korean anti-ballistic missile system
glide phase interceptor (GPI) missiles, and is estimated to have an interception altitude of 180 km. Korean Air and Missile Defense Comparable systems THAAD
L-SAM
American surface-to-air missile system since 1981
third Patriot system to Ukraine. Thus, Germany provides Ukraine with a total of 3 systems... This is a quarter of our own stocks of such systems, and we no
MIM-104_Patriot
Electricity converter
England The first phase of the Nelson River DC Transmission System in Canada The thyristor valve was first used in HVDC systems in 1972 on the Eel River
HVDC_converter
States of matter for water as a solid
rise to different phases of ice, which have varying properties and molecular geometries. Currently, twenty-two crystalline phases have been observed
Phases_of_ice
Survivable Light Armored Vehicle, 4-door truck
Retrieved 2012-02-09. "BAE Systems and Navistar Unveil Joint Light Tactical Vehicle Prototype at AUSA Winter Symposium". BAE Systems. 2008-02-27. Retrieved
BAE_Systems_Valanx
Alternating current electrical generator
continuously alternating voltage. Single-phase generators can be used to generate power in single-phase electric power systems. However, polyphase generators are
Single-phase_generator
This list of metro systems includes electrified rapid transit train systems worldwide. In some parts of the world, metro systems are referred to as subways
List_of_metro_systems
Israeli military technology company
Elbit Systems Ltd. is an Israel-based international military technology company and defense contractor. Founded in 1966 by Elron, Elbit Systems is the
Elbit_Systems
Interdisciplinary study of systems
Systems theory is the transdisciplinary study of systems, i.e., cohesive groups of interrelated, interdependent components that can be natural or artificial
Systems_theory
Expendable launch system program of the United States Space Force
Retrieved March 28, 2025. Space Systems Command (April 4, 2025). "Space Systems Command awards National Security Space Launch Phase 3 Lane 2 contracts". United
National Security Space Launch
National_Security_Space_Launch
Situation requiring urgent intervention
level of response. Other systems (especially as regards major incidents) use objective measures to direct resource. Two such systems are SAD CHALET and ETHANE
Emergency
European club football competition
36-team league phase. The new format also did not allow teams to transfer from the Europa League to the Conference League from the league phase onwards, and
2025–26 UEFA Conference League
2025–26_UEFA_Conference_League
Mixture of two or more immiscible liquids
unblendable) owing to liquid-liquid phase separation. Emulsions are part of a more general class of two-phase systems of matter called colloids. Although
Emulsion
Specialised type of power transformer
A phase angle regulating transformer, phase angle regulator (PAR, American usage), phase-shifting transformer, phase shifter (American usage), or quadrature
Quadrature_booster
Marvel Comics superhero team
Jackson, Matthew (July 20, 2019). "Marvel Studios drops huge Phase 4 details plus Fantastic Four, Blade, and mutants". Syfy.com. Archived from the original
Fantastic_Four
South Korean medium range surface-to-air missile
missile systems. Originally designated as Cheolmae-2 (Iron Hawk; Korean: 철매; Hanja: 鐵鷹; RR: Cheol-mae) during its development phase, the system was officially
M-SAM
Ballistic missile with a range of more than 5,500 kilometres
anti-ballistic missile systems. Early examples of anti-ICBM defenses were nuclear tipped systems such as the Soviet A-35 anti-ballistic missile system, and the American
Intercontinental ballistic missile
Intercontinental_ballistic_missile
Digital circuit without clock cycles
micropipelines, whether they use a two-phase or four-phase protocol, even if the term was initially introduced for two-phase bundled-data. Multi-rail encoding
Asynchronous_circuit
Geometric space with six dimensions
dimensions has a phase space with six dimensions, too many to plot but they can be analysed mathematically. The rotation group in four dimensions, SO(4)
Six-dimensional_space
Class of New York City Subway car
R179 cars are equipped with updated control systems, HVAC, and public address systems. The new HVAC systems are noticeably quieter on the outside of the
R179 (New York City Subway car)
R179_(New_York_City_Subway_car)
55th season of the UEFA club football tournament
league phase in positions 9–16 were seeded, and the eight teams finishing the league phase in positions 17–24 were unseeded. The draw was split into four sections
2025–26_UEFA_Europa_League
Electricity distribution networks circuit breakers
G., "Power distribution system lateral protection and method", issued 2022-04-12 "ABB 3 phase Auto Recloser". "Eaton 3 phase autorecloser datasheet"
Recloser
Electric current that periodically reverses direction
of one or all phase conductors. For three-phase at utilization voltages a four-wire system is often used. When stepping down three-phase, a transformer
Alternating_current
Football tournament qualification stage
qualifying system, which included the qualifying phase and the play-off round. The 12 winners of the play-off round advanced to the league phase, to join
2025–26 UEFA Europa League qualifying
2025–26_UEFA_Europa_League_qualifying
Field of mathematics and science based on non-linear systems and initial conditions
such dynamic systems, rendering long-term prediction of their behavior impossible in general. This can happen even though these systems are deterministic
Chaos_theory
American satellite-based radio navigation service
developed their own satellite navigation systems. These systems include: The Russian Global Navigation Satellite System (GLONASS) was developed at the same
Global_Positioning_System
Conversion of railways to use electricity for propulsion
traversing gaps in the supply, such as phase change gaps in overhead systems, and gaps over points in third rail systems. These become a nuisance if the locomotive
Railway_electrification
Mass Rapid Transit line under construction in Singapore
alignment and stations of Phase 1 were finalised in 2019, followed by the Punggol branch in 2020, Phase 2 in 2022, and Phase 3 in 2026. The proposed full
Cross_Island_Line
Measurement method using interference of waves
2012. "How Phase Interferometers work". Graham Optical Systems. 2011. Retrieved 12 May 2012. Schreiber, H.; Bruning, J. H. (2007). "Phase Shifting Interferometry"
Interferometry
two-phase coexistence terminates. A point of three-phase coexistence is termed a triple point for a one-component system, since, from Gibbs' phase rule
Tricritical_point
Chinese astrological and calendrical destiny calculation system
analysis. In this respect, Four Pillars practice often intersects with feng shui consultation, as both systems share the Five Phases framework and are frequently
Four_Pillars_of_Destiny
Process of varying one or more properties of a periodic waveform
implementation, often used in telemetry and paging systems. Phase Shift Keying (PSK): Modifies the phase of the carrier signal based on data. Common forms
Signal_modulation
Class of British nuclear-powered ballistic missile submarines
BAE Systems Submarines, when the first submarine was provisionally expected to enter service in 2028. The start of construction of the second phase was
Dreadnought-class_submarine
Indian railway safety technology
Drives, Kernex Microsystems and HBL Power Systems. Initially it was known by the name Train Collision Avoidance System (TCAS). Kavach was adopted by Ministry
Kavach (train protection system)
Kavach_(train_protection_system)
European football tournament
league phase in positions 9–16 were seeded, and the eight teams finishing the league phase in positions 17–24 were unseeded. The draw was split into four sections
2024–25_UEFA_Champions_League
Phases of Earth as seen from the Moon
Earth phase is the shape of the directly sunlit portion of Earth as viewed from the Moon (or elsewhere extraterrestrially). From the Moon, Earth phases gradually
Earth_phase
American/Italian wheeled design program
BAE Systems and Iveco with Iveco SuperAV vehicle and the SAIC Terrex vehicle to move on to the Engineering and Manufacturing Development (EMD) phase of
Amphibious_Combat_Vehicle
Converts output of a photovoltaic panel into a utility frequency alternating current
Solar inverters may be classified into four broad types: Stand-alone inverters, used in stand-alone power systems where the inverter draws its DC energy
Solar_inverter
Electric vehicle charging standard
process such as load balancing and charge authorization. Competing charging systems for high-power DC charging include CHAdeMO (widely used in Japan, previously
Combined_Charging_System
Four ocean-going patrol vessels constructed for the Royal Netherlands Navy
the Thales integrated mast, which integrates communication systems and two four-faced phased arrays for air and surface search. A contract between the
Holland-class_patrol_vessel
Type of AC electric motor
Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable, and economical. Single-phase induction
Induction_motor
Parameter describing physics near critical points
for systems at thermal equilibrium, the conformal bootstrap techniques. Phase transitions and critical exponents appear in many physical systems such
Critical_exponent
FOUR PHASE-SYSTEMS
FOUR PHASE-SYSTEMS
Girl/Female
Hindu
Phases of Moon
Girl/Female
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Telugu
Phase; Time of Day
Girl/Female
Tamil
Shashikala | ஷஷிகலா
Phases of Moon
Shashikala | ஷஷிகலா
Boy/Male
Bengali, French, Hebrew, Indian
Fair; Red; White
Girl/Female
Indian, Telugu
A Phase of Life; Childhood
Surname or Lastname
English
English : from Middle English pese ‘pea’, hence a metonymic occupational name for a grower or seller of peas, or a nickname for a small and insignificant person. The word was originally a collective singular (Old English peose, pise, from Latin pisa) from which the modern English vocabulary word pea is derived by folk etymology, the singular having been taken as a plural.Robert and John Pease came from Great Baddow, Essex, England, to Salem, MA, in 1634. In 1644 Robert died, leaving a son (also called Robert) who was apprenticed as a weaver in Salem. By 1646 John Pease was living on Martha’s Vineyard.
Boy/Male
African
Rock.
Surname or Lastname
German
German : nickname for a swift runner or a timorous person, from Middle High German, Middle Low German hase ‘hare’.Jewish (Ashkenazic) : ornamental name from German Hase ‘hare’.English : from a Middle English nickname, Hase, from Old English hÄs ‘harsh, raucous, or hoarse voice’.Japanese : usually written with characters meaning ‘long valley’; habitational name from a place in Yamato (now Nara prefecture). Listed in the Shinsen shÅjiroku. Some bearers are descended from the Taira clan; they are found mainly in eastern Japan. Also pronounced Nagaya and Nagatani; the original pronunciation was Hatsuse, meaning ‘beginning of the strait’.
Surname or Lastname
English
English : metonymic occupational name for a huntsman, or rather a nickname for an exceptionally skilled huntsman, from Middle English chase ‘hunt’ (Old French chasse, from chasser ‘to hunt’, Latin captare).Southern French : topographic name for someone who lived in or by a house, probably the occupier of the most distinguished house in the village, from a southern derivative of Latin casa ‘hut’, ‘cottage’, ‘cabin’.Thomas Chase came to MA from Chesham, Buckinghamshire, England, in the 1640s, and had many prominent descendants. Samuel Chase, born in Somerset Co., MD, in 1741, was one of the first members of the U.S. Supreme Court; Philander Chase, born in Cornish, NH, in 1741 was a prominent Episcopal clergyman, and his nephew Salmon Portland Chase (1808–73), also born in Cornish, was governor of OH, a U.S. senator, and secretary of the U.S. Treasury during the Civil War.
Male
French
French form of Latin Stephanus, STÉPHANE means "crown."
Boy/Male
Hindu, Indian, Punjabi, Sikh
Princess
Boy/Male
American, Australian, British, Chinese, Christian, English, French
Huntsman; Hunter
Boy/Male
English American
Huntsman.
Girl/Female
Indian, Punjabi, Sikh
Tears of Eyes
Girl/Female
Tamil
Phase, Time of day
Boy/Male
Muslim/Islamic
Light
Boy/Male
Scottish
From the water.
Boy/Male
German
Chase; Hunt
Boy/Male
African, Arabic, Australian, Lebanese
Light
Male
English
Middle English surname (of Norman French origin) transferred to forename use, CHASE means "hunter."Â
FOUR PHASE-SYSTEMS
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FOUR PHASE-SYSTEMS
FOUR PHASE-SYSTEMS
FOUR PHASE-SYSTEMS
FOUR PHASE-SYSTEMS
FOUR PHASE-SYSTEMS