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IBM 1620 - Implementation levels | A Wisdom Archive on IBM 1620 - Implementation levels | | IBM 1620 - Implementation levels A selection of articles related to IBM 1620 - Implementation levels | |
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IBM 1620, IBM 1620 - A flawed architecture, IBM 1620 - Character and Op codes, IBM 1620 - Development history, IBM 1620 - Hardware implementation, IBM 1620 - Implementation levels, IBM 1620 - Patents, IBM 1620 - Related peripheral units, IBM 1620 - The 1620's architecture, IBM 1620 - Trivia
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ARTICLES RELATED TO IBM 1620 - Implementation levels | | | |  IBM 1620 - Implementation levels: Encyclopedia II - IBM 1620 - Development historyIn 1958 IBM assembled a team at the Poughkeepsie, New York development laboratory to study the "small scientific market". Initially the team consisted of Wayne Winger (Manager), Robert C. Jackson, and William H. Rhodes.
The competing computers in this market were the Librascope LGP-30 and the Bendix G-15, both were drum memory machines and it was concluded that IBM could offer nothing really new in that area. To compete effectively would require use of technologies that IBM had developed for larger computers, yet the machine would ...
See also:IBM 1620, IBM 1620 - The 1620's architecture, IBM 1620 - Character and Op codes, IBM 1620 - A flawed architecture, IBM 1620 - Hardware implementation, IBM 1620 - Development history, IBM 1620 - Implementation levels, IBM 1620 - Patents, IBM 1620 - Related peripheral units, IBM 1620 - Trivia Read more here: » IBM 1620: Encyclopedia II - IBM 1620 - Development history |
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| | | | IBM 1620 - Implementation levels: Encyclopedia II - IBM 1620 - Hardware implementation Most of the logic circuitry of the 1620 was a type of resistor-transistor logic (RTL) using "drift" transistors (a type of transistor invented by Herbert Kroemer in 1957) for their speed, that IBM referred to as SDTRL. Other IBM circuit types used were referred to as: Alloy (some logic, but mostly various non-logic functions, named for the kind of transistors used), CTRL (another type of RTL, but slower than SDTRL), CTDL (a type of diode-transistor logic (DTL)), and DL (another type of RTL, named for ...
See also:IBM 1620, IBM 1620 - The 1620's architecture, IBM 1620 - Character and Op codes, IBM 1620 - A flawed architecture, IBM 1620 - Hardware implementation, IBM 1620 - Development history, IBM 1620 - Implementation levels, IBM 1620 - Patents, IBM 1620 - Related peripheral units, IBM 1620 - Trivia Read more here: » IBM 1620: Encyclopedia II - IBM 1620 - Hardware implementation |
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| | | | IBM 1620 - Implementation levels: Encyclopedia II - IBM 1620 - The 1620's architecture It was a variable "word" length decimal (BCD) computer with a memory that could hold anything from 20,000 to 60,000 decimal digits increasing in 20,000 decimal digit increments. While the 5-digit addresses could have addressed 100,000 decimal digits, no machine larger than 60,000 decimal digits was ever built.
Memory was accessed two decimal digits at the same time (even-odd digit pair for numeric data or one alphameric character for text data). Each decimal digit was 6 bits, composed of an odd parity Check bit, a Flag bit, and four BCD bits for the value of the digit ...
See also:IBM 1620, IBM 1620 - The 1620's architecture, IBM 1620 - Character and Op codes, IBM 1620 - A flawed architecture, IBM 1620 - Hardware implementation, IBM 1620 - Development history, IBM 1620 - Implementation levels, IBM 1620 - Patents, IBM 1620 - Related peripheral units, IBM 1620 - Trivia Read more here: » IBM 1620: Encyclopedia II - IBM 1620 - The 1620's architecture |
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