1A Processor: Memory Systems

Abstract

The memory hierarchy of the 1A Processor consists of call/program stores, file stores, and an auxiliary data system utilizing magnetic tape. The call/program store is a 65,536‐word, 26‐bit‐per‐word memory system using a two‐wire, coincident‐current, ferrite‐core array as the memory medium, and is capable of operating with a 1.4‐μs read/write cycle time. The file store (fs) with its disk‐file memory provides the 1A Processor with a high‐performance bulk‐storage system. Each fs controller can control from one to four disk files to provide a maximum storage of 2.56 × 106 words. Two fss make up a file‐store community of 5.12 × 106 words of duplicated storage. The auxiliary data system (ads) provides a means for efficiently transferring data between the 1A Processor call‐ or program‐store memories and magnetic tape. The tape medium is used for inputting generic programs, office data, and trouble‐location information and for out putting billing, traffic, and error‐analysis data. The ads hardware consists of data unit selectors (duss) and tape frames (tfs).