GB986929A - Improvements in or relating to data processing apparatus - Google Patents

Improvements in or relating to data processing apparatus

Info

Publication number
GB986929A
GB986929A GB2081661A GB2081661A GB986929A GB 986929 A GB986929 A GB 986929A GB 2081661 A GB2081661 A GB 2081661A GB 2081661 A GB2081661 A GB 2081661A GB 986929 A GB986929 A GB 986929A
Authority
GB
United Kingdom
Prior art keywords
program
transferred
address
data
store
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2081661A
Inventor
Aryl Leib Freedman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Decca Ltd
Original Assignee
Decca Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Decca Ltd filed Critical Decca Ltd
Priority to GB2081661A priority Critical patent/GB986929A/en
Priority to US226855A priority patent/US3284776A/en
Publication of GB986929A publication Critical patent/GB986929A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • G06F12/1458—Protection against unauthorised use of memory or access to memory by checking the subject access rights
    • G06F12/1466—Key-lock mechanism
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/24—Handling requests for interconnection or transfer for access to input/output bus using interrupt

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Multi Processors (AREA)

Abstract

986,929. Data transfer arrangements for electronic computers. DECCA Ltd. Aug. 29, 1962 [June 8, 1961], No. 20816/61. Drawings to Specification. Heading G4A. In a computer time-shared between a number of independent programs, means are provided to check that data associated with one program is not transferred to a peripheral unit, or a part of the store, associated with another. The peripheral units each have a register in which a number identifying their program is stored, and before data is transferred to or from them it is compared with the "current program" register in the central processor. When data is to be transferred to or from an address in the rapid-access store, this address is compared with the address limits assigned to that program and read-out from a separate store for a double subtraction test. Specification 952,057 is referred to.
GB2081661A 1961-06-08 1961-06-08 Improvements in or relating to data processing apparatus Expired GB986929A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2081661A GB986929A (en) 1961-06-08 1961-06-08 Improvements in or relating to data processing apparatus
US226855A US3284776A (en) 1961-06-08 1962-09-28 Data processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2081661A GB986929A (en) 1961-06-08 1961-06-08 Improvements in or relating to data processing apparatus

Publications (1)

Publication Number Publication Date
GB986929A true GB986929A (en) 1965-03-24

Family

ID=10152172

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2081661A Expired GB986929A (en) 1961-06-08 1961-06-08 Improvements in or relating to data processing apparatus

Country Status (1)

Country Link
GB (1) GB986929A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2315146A1 (en) * 1975-06-18 1977-01-14 Ibm UPPER MEMORY LIMIT ADDRESS VERIFICATION SYSTEM

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2315146A1 (en) * 1975-06-18 1977-01-14 Ibm UPPER MEMORY LIMIT ADDRESS VERIFICATION SYSTEM

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