Timing System
Modems
Browsers
*
The British Aerospace Harrier, now in three versions entered service in (first flight -GR.1 December 28) 1967. The GR.3 was used in the Falklands war, now the model is GR.5. The Royal Navy has a version called the Sea Harrier FRS.1, and McDonnell Douglas manufactures a version for the U.S. Marine Corps. called the AV-8B Harrier II.
The computer which is used to control modern aircraft is vulnerable to corruption as information is uploaded and downloaded after flight. This is mostly mapping and camera data.
*
The flight computer is a an 8k word computer and ties the various units of the Navhars (Nav and heading/attitude ref system), Ferranti unit which, to avoid alignment inaccuracy at sea, is no longer pure inertial but comprises a lower-cost twin-gyro platform monitored by a Decca 72 doppler. The entire system is digital, self monitoring and in most cases fitted with integral fault diagnosis.
*
Smiths provide the Hudwac (HUD weapon-aiming computer), whose portion has 20k words and serves as a flexible generator of graphics and symbology for air/air or air/ground aiming.
The solution was to develop, or write a new computer language (JavaScript) which is powerful but yet contains little or no danger of corrupting the system (basic operating instructions) of the computer on which it is running. This was achieved. The only problem with it is that JavaScript, which contains its own fault correction software to detect programming errors, tends to be written in lines of extreme length, which are context sensitive, in that the meaning of instruction codes change according to what precedes or follows them, and there is no comprehensive manual to explain what the code means. The only way to decipher it is to use another computer to interrogate the system. Fortunately there is an abundance of computers available which are powerful enough to do this.