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CAB500
The CAB500 was a French transistor-based drum computer, designed at SEA around 1957 by Alice Recoque. The computer had an incremental compiler for a language, PAF ( Programmation Automatique des Formules) similar to Fortran, designed by Dimitri Starynkevitch in 1957-1959. CAB 500's first model was delivered in February, 1961, and more than a hundred exemplars were built. It had a magnetic drum Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria. Drums were widely used in the 1950s and into the 1960s as computer memory. For many early computers, drum memory formed the main working memory ... memory of rotating at and could invert a square matrix of order 25 in half an hour. The CAB 500 weighed about .{{cite web , title=SEA CAB-500 , url=http://www.feb-patrimoine.com/english/sea_cab500.htm , website=FEB-patrimoine References Transistorized computers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alice Recoque
Alice Recoque (''born'' Arnaud; 29 August 1929 – 28 January 2021) was a French computer scientist, computer engineer and computer architecture specialist. She worked on the designs of mini-computers in the 1970s and led research focused on artificial intelligence. Early life Alice Arnaud was born on 29 August 1929 in Cherchell, Algeria. She finished École supérieure de physique et de chimie industrielles in 1954 with a title of graduate engineer. Career She started working at Société d'électronique et d'automatisme (SAE) in 1954. At SAE she worked on core memories of CAB1101. In 1956 Alice Recoque and Françoise Becquet started designing the mini-computer CAB500 - the first conversational desktop computer, under the direction of André Richard and François-Henri Raymond. The computer was released in 1960. The CAB500 was a French low cost mini-computer, the purpose of which was to do complex, scientific calculations. She also worked on the CINA industrial computer a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Programmation Automatique Des Formules
Programmation Automatique des Formules is a programming language designed in 1957-1959 by Dimitri Starynkevitch at SEA, a small French computer company. PAF was similar to FORTRAN. It ran on a drum computer, the CAB500 The CAB500 was a French transistor-based drum computer, designed at SEA around 1957 by Alice Recoque. The computer had an incremental compiler for a language, PAF ( Programmation Automatique des Formules) similar to Fortran, designed by Dimitri S .... The title is French for ''Automatic Programming of Formulae''. External links Programmation Automatique des Formules {{Compu-lang-stub Information technology companies of France Programming languages created in 1957 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Drum
Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria. Drums were widely used in the 1950s and into the 1960s as computer memory. For many early computers, drum memory formed the main working memory of the computer. It was so common that these computers were often referred to as ''drum machines''. Some drums were also used as secondary storage as for example various IBM drum storage drives. Drums were displaced as primary computer memory by magnetic core memory, which offered a better balance of size, speed, cost, reliability and potential for further improvements. Drums in turn were replaced by hard disk drives for secondary storage, which were both less expensive and offered denser storage. The manufacturing of drums ceased in the 1970s. Technical design A drum memory or drum storage unit contained a large metal cylinder, coated on the outside surface with a ferromagnetic recording material. It could be considered the precur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Invertible Matrix
In linear algebra, an -by- square matrix is called invertible (also nonsingular or nondegenerate), if there exists an -by- square matrix such that :\mathbf = \mathbf = \mathbf_n \ where denotes the -by- identity matrix and the multiplication used is ordinary matrix multiplication. If this is the case, then the matrix is uniquely determined by , and is called the (multiplicative) ''inverse'' of , denoted by . Matrix inversion is the process of finding the matrix that satisfies the prior equation for a given invertible matrix . A square matrix that is ''not'' invertible is called singular or degenerate. A square matrix is singular if and only if its determinant is zero. Singular matrices are rare in the sense that if a square matrix's entries are randomly selected from any finite region on the number line or complex plane, the probability that the matrix is singular is 0, that is, it will "almost never" be singular. Non-square matrices (-by- matrices for which ) do not hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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