In determining the maximum repetition rate of a given switching circuit, the response of the switching device and the effect of other circuit parameters (including stray elements) must be taken into account. Although the switching speed is ultimately limited by the device, in many cases one never reaches this theoretical maximum because circuit limitations play the dominant role. To solve this problem, one is forced to devise extremely simple circuits with few components in order to minimize the effect of stray reactance. The use of two-terminal negative-resistance elements allows one to do this.
{"title":"Negative-resistance elements as digital computer components","authors":"M. Lewin","doi":"10.1145/1460299.1460301","DOIUrl":"https://doi.org/10.1145/1460299.1460301","url":null,"abstract":"In determining the maximum repetition rate of a given switching circuit, the response of the switching device and the effect of other circuit parameters (including stray elements) must be taken into account. Although the switching speed is ultimately limited by the device, in many cases one never reaches this theoretical maximum because circuit limitations play the dominant role. To solve this problem, one is forced to devise extremely simple circuits with few components in order to minimize the effect of stray reactance. The use of two-terminal negative-resistance elements allows one to do this.","PeriodicalId":281900,"journal":{"name":"IRE-AIEE-ACM '59 (Eastern)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1899-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115960933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A Memory with dimensions compatible with microminiature assemblies is required for future computers to be used in missiles and aircraft. A drum memory is described which can fulfill this need. The bit rate of 546 kc makes possible a 20-bit serial word time of the order of 40 microseconds. For a computer with add and multiply times of 40 microseconds, the drum memory described is adequate. Moreover, the technique described can be extended to provide a 20-microsecond word time by doubling the rotational speed of the drum, and to 10 microseconds or less by reading out two or more bits in parallel. A memory capacity of 15,000 twenty-bit words is available in the 7.4 X 3.7 X 3.7 inch total unit size, which is adequate for the type of computations usually made in an aircraft or missile. The advantage of such a drum memory as compared with a ferrite core memory, for example, is in cost, size, and ability to perform over wide temperature ranges. The disadvantage of the lack of immediate access to any address can for the most part be overcome by suitable programming precautions.
未来用于导弹和飞机的计算机需要与微型组件尺寸兼容的存储器。一种鼓式存储器可以满足这种需要。546 kc的比特率使得大约40微秒的20位串行字时间成为可能。对于加乘时间为40微秒的计算机，所描述的磁鼓存储器是足够的。此外，所描述的技术可以通过将磁鼓的转速加倍来提供20微秒的字时间，并且可以通过并行读出两个或更多位来提供10微秒或更少的字时间。在7.4 X 3.7 X 3.7英寸的总单元尺寸中，可获得15,000个20位字的存储容量，这对于通常在飞机或导弹中进行的计算类型是足够的。例如，与铁氧体磁芯存储器相比，这种鼓式存储器的优势在于成本、尺寸和在宽温度范围内工作的能力。缺乏对任何地址的直接访问的缺点在很大程度上可以通过适当的编程预防措施来克服。
{"title":"A high speed, small size magnetic drum memory unit for subminiature digital computers","authors":"M. May, G. Miller, R. A. Howard, G. A. Shifrin","doi":"10.1145/1460299.1460321","DOIUrl":"https://doi.org/10.1145/1460299.1460321","url":null,"abstract":"A Memory with dimensions compatible with microminiature assemblies is required for future computers to be used in missiles and aircraft. A drum memory is described which can fulfill this need. The bit rate of 546 kc makes possible a 20-bit serial word time of the order of 40 microseconds. For a computer with add and multiply times of 40 microseconds, the drum memory described is adequate. Moreover, the technique described can be extended to provide a 20-microsecond word time by doubling the rotational speed of the drum, and to 10 microseconds or less by reading out two or more bits in parallel. A memory capacity of 15,000 twenty-bit words is available in the 7.4 X 3.7 X 3.7 inch total unit size, which is adequate for the type of computations usually made in an aircraft or missile. The advantage of such a drum memory as compared with a ferrite core memory, for example, is in cost, size, and ability to perform over wide temperature ranges. The disadvantage of the lack of immediate access to any address can for the most part be overcome by suitable programming precautions.","PeriodicalId":281900,"journal":{"name":"IRE-AIEE-ACM '59 (Eastern)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1899-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127665458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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