FYQ-93 was a computer system used from 1983-2006, and built for the Joint Surveillance System (JSS) by the Hughes Aircraft Company .  The system consists of a fault tolerant central computer complex with a two-way communication between a network and a network.
This system is composed of two components, one of the following: The HMD-22 consoles displayed data from various radars including the AN / GSQ-235. The United States (CONUS), Canada, Alaska and Hawaii.
The need for the FYQ-93 system became apparent in the 1970s when the Semi-Automatic Ground Environment (SAGE) system became technologically obsolete and logistically unsupportable. The FYQ-93 system was conceived and specified in the late 1970s. It was manufactured and delivered during the first half of the 1980s by the end of 1984, all nine facilities were in place. Enough of the system was in place in 1983 for the SAGE system and officially became part of the United States and Canada. The wide network of military long range radar sites was closed and a much smaller number (43) of the FAA Joint Use sites replaced them.
The JSS was joined USAF / FAA radar use program. The ACC portion of the JSS was made up of four FUS-93 computers, and 47 ground-based FPS-93 Search Radars. FAA equipment was a mix of Air Route Surveillance Radar (ARSR) 1, 2, and 3 systems. Collocated with most radar sites were UHF ground-air-ground (G / A / G) transmitter / receiver (GATR) facilities. Fourteen sites have VHF radios too. The GATR facility provided by AWCS aircraft from the SOCCs.
The JSS radar is monitoring data to the SOCCs, which is then forwarded to CONUS ROCC and North American Air Defense Command (NORAD). Radar and track data were sent through TADIL-B data and through HF radio links as TADIL-A data. Both TADIL links were provided by the Radar Data Information Link (RADIL). CONUS SOCCs with the CONUS ROCC and NORAD by voice and data landline circuits.
H5118ME Central Computer Hughes HMP-1116 Peripheral computers. Radar data was input and buffered in one 1116 for orderly transfer to the 5118, which then constructed the “air picture”. The second 1116 loading, console commands, and data storage. The output of the string fed another 1116 called “Display Controller” (DC), which receives data from the HMD-22 consoles. Typically there are two strings and two DCs processing in parallel, one on standby in case of a malfunction in its counterpart. Either string could feed DC for further equipment reliability.
The software was written in a proprietary version of the programming language JOVIAL termed JSS JOVIAL. The system is updated over time to change tape drives to disk cartridges and single-line printers to multi-line printers. The memory in the H5118ME was expanded at least twice to the maximum system of 512,000 18-bit words.
The H5118E was eventually upgraded to the H5118M computer which had 1 megabyte of memory and could handle 1.2 million instructions per second while the original model had a memory of 256 kilobytes and a clock speed of 150000 instructions per second. Although the H5118M was part of the NATO Integrated Air Defense System it was unclear if JSS received the same upgrades.
Internal to Hughes, the next generation of Air Defense and Air Traffic Control Systems have been developed. The next generation was based on some computer processing. Examples include DEC VAX and Norsk Data Systems. This was driven by the needs of different countries who used their computers for their in-country systems. This was also driven by the great miniaturization of computer hardware. The next generation Hughes systems 2K X 2K resolution 20 “X 20” color raster displays, touch entry, voice synthesis and recognition consoles, dual redundant Fiber Optic Token ring nozzles to link all consoles and computers, extensive processing in the consoles including mission processing ,Ada . 
The FYQ-93 was part of a long history of developing air defense systems starting in the 1950s. The FYQ-93 was based on the Great System Combat which was one of the first systems to extensively use science and engineering principals to develop software.  This allowed for extensive re-use and optimization for the needs of each country and the Hughes Systems.
- Joint Surveillance System
- NATO Integrated Air Defense System
- ^ Jump up to: a b D. Kenneth Richardson (2011). Hughes After Howard: The Story of Hughes Aircraft Company. Sea Hill Press. ISBN 978-0-9708050-8-9 .
- Jump up^ Walter Sobkiw (2011). Systems Practices as Common Sense. CassBeth. ISBN 978-0-9832530-8-2.
- Jump up^ Technical Report CMU / SEI-98-TR-006 ESC-TR-98-006 Hughes Aircraft’s Widespread Deployment of a Continuously Improving Software Process