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Reference / Glossary

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Cross References
           
40 Thomas J. Watson, Jr., said of the System/360 when it as introduced in April 1964 that it was "the most significant product announcement in IBM history." The word "system" was chosen to signify that the new product line was an interchangeable family of processors and peripherals with programming compatibility between all models. The Model 40 had a maximum memory of 256K, a cycle time of 2.5 microseconds and it transferred 16 bits per cycle. It was withdrawn from marketing in October 1977.
 
405 Introduced in 1934, the 405 Alphabetical Accounting Machine was the basic bookkeeping and accounting machine marketed by IBM for many years. Important features were expanded adding capacity, greater flexibility of counter grouping, direct printing of entire alphabet, direct subtraction and printing of either debit or credit balance from any counter. Commonly called the 405 "tabulator," this machine remained the flagship of IBM's product line until after World War II.
 
4341 [1] Announced in January 1979, the 4341 Processor provided high system performance for commercial, engineering, scientific and academic users of intermediate size System/370s and large System/360s. It was available in two model groups.
 
4341 [2] Model Group 1 had an internal performance rate up to 3.2 times faster than the System/370 Model 138 and up to four times the processor storage capacity of the 138. Model Group 2 had an internal performance rate up to 1.8 times that of Model Group 1 and a processor storage capacity up to two times that of Model Group 1. The 4341 was withdrawn from marketing in February 1986.
 
4381 [1] Boasting of state-of-the-art technology, IBM launched the 4381 processor in September 1983 to reenforce the company's commitment to professional, engineering and scientific users. Available in Model Groups 1 and 2, the 4381 was developed in IBM's Endicott, N.Y., facility and manufactured in Endicott; Vallencia, Spain and Sumare, Brazil.
 
4381 [2] The 4381 bridged the gap in the 1980s between IBM's intermediate 4300 processors and the larger 308X processors. Among its technology advances were high-density, 64-millimeter-square modules that contained a maximum of 36 Large Scale Integration chips each, achieving up to 25,000 circuits per module. Users could obtain up to 16 megabytes of memory with the 4381, and up to 12 input/output channels. The 4381 was withdrawn from marketing in February 1986.
 
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