SYSTEME REPERTOIRE DE DONNEES A ACCES EN PARALLELE

摘要

A central file system in which information in the form of data associated with identifying operands is stored in random sequence at separate locations of a storage medium, and these locations are cyclically scanned by read/write means at the storage medium. Multiple participating access stations having display means and data-input means are each coupled with their own comparator means, and all comparator means can simultaneously receive the scanned operands and data on an equal priority basis, and compare the operands arriving on-the-fly with operands respectively entered at the associated stations. When coincidence is found at any comparator, the data associated with that operand is temporarily stored for display at the associated station. At the beginning of each storage medium location being read-out, each station seeking coincidence has its search logic reset to assume coincidence for that particular storage location, and then a bit-by-bit on-the-fly comparison is made as the information is read out. If coincidence persists for the whole operand being read from that storage location, the data therein is retained for display. If not, the data is dumped from that station's temporary storage register by replacement with data read-out from the next storage location to be scanned. Any station can update the central storage medium's information by entering a priority mode, in which the other stations are momentarily locked-out from access, and then erasing and/or replacing data in a particular storage medium location.