GB1271712A - Digital electric business machine when programmed for calculating a check sum - Google Patents

Digital electric business machine when programmed for calculating a check sum

Info

Publication number
GB1271712A
GB1271712A GB2023269A GB2023269A GB1271712A GB 1271712 A GB1271712 A GB 1271712A GB 2023269 A GB2023269 A GB 2023269A GB 2023269 A GB2023269 A GB 2023269A GB 1271712 A GB1271712 A GB 1271712A
Authority
GB
United Kingdom
Prior art keywords
check sum
calculating
sum
location
check
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
GB2023269A
Inventor
Helmut Logisch
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.)
Zentronik VEB
Original Assignee
Zentronik VEB
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 Zentronik VEB filed Critical Zentronik VEB
Priority to GB2023269A priority Critical patent/GB1271712A/en
Publication of GB1271712A publication Critical patent/GB1271712A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
    • G06F11/1012—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error
    • G06F11/104—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error using arithmetic codes, i.e. codes which are preserved during operation, e.g. modulo 9 or 11 check

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Detection And Correction Of Errors (AREA)

Abstract

1,271,712. Business machines; check sums. KOMBINAT ZENTRONIK VEB. 21 April, 1969, No. 20232/69. Heading G4A. A digital electric business machine is programmed for calculating a check sum based on a modulus wherein a number is transferred from an input store ER to an arithmetic unit ASW, a calculation is initiated in the unit ASW for calculating a check sum for the number and a correction which depends on the modulus on which the number is based, and the check sum is then stored in a location of the input store. The numbers may represent account, article or material numbers, and a 4-bit check sum is calculated by multiplying the number digits by different weighting factors (e.g. 2<SP>5</SP>, 2<SP>4</SP>, 2<SP>3</SP> &c.) and dividing the product sum by a suitable modulus, e.g. 9, 10, 11 in a known manner. The present machine is distinguished from the prior art in that the check sum is returned to a location in the input store ER. This location is usually occupied by sign bits or by the highest decimal place and means are provided for preventing a carry passing from the check sum to the rest of the store. Errors are detected by recalculating the check sum. Other features mentioned include subtraction, a keyboard, and ferrite cores.
GB2023269A 1969-04-21 1969-04-21 Digital electric business machine when programmed for calculating a check sum Expired GB1271712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2023269A GB1271712A (en) 1969-04-21 1969-04-21 Digital electric business machine when programmed for calculating a check sum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2023269A GB1271712A (en) 1969-04-21 1969-04-21 Digital electric business machine when programmed for calculating a check sum

Publications (1)

Publication Number Publication Date
GB1271712A true GB1271712A (en) 1972-04-26

Family

ID=10142564

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2023269A Expired GB1271712A (en) 1969-04-21 1969-04-21 Digital electric business machine when programmed for calculating a check sum

Country Status (1)

Country Link
GB (1) GB1271712A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472783A1 (en) * 1979-12-28 1981-07-03 Honeywell Inf Systems DATA PROCESSING SYSTEM HAVING AUTOCONTROL CAPABILITY

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472783A1 (en) * 1979-12-28 1981-07-03 Honeywell Inf Systems DATA PROCESSING SYSTEM HAVING AUTOCONTROL CAPABILITY

Similar Documents

Publication Publication Date Title
GB1531919A (en) Arithmetic units
ES8304680A1 (en) Data processor performing a decimal multiply operation using a read only memory
US3725656A (en) Computing system for use in price indicating balance
GB1123619A (en) Divider circuit
GB1166646A (en) Electronic Digital Data Processing Machine
GB1271712A (en) Digital electric business machine when programmed for calculating a check sum
GB1081538A (en) Computing and weighing apparatus
GB1439915A (en) Check digit generation verification apparatus
GB1329272A (en) Arithmetical multiplying systems
GB991734A (en) Improvements in digital calculating devices
GB802656A (en) Electronic digital computer
US2920820A (en) Ten&#39;s complement circuit
GB790323A (en) Electrical checking circuit
GB1114503A (en) Improvements in or relating to data handling apparatus
US3557355A (en) Data processing system including means for detecting algorithm execution completion
GB838301A (en) Improvements relating to electronic computer checking circuits
SU646331A1 (en) Binary number divider
GB1386427A (en) Electronic balance
GB1014391A (en) Improvements in arithmetic units for digital calculators and the like
GB847996A (en) Arithmetic circuitry
GB936331A (en) Improvements in data processing systems
JPS54162936A (en) Data processor
GB771764A (en) An improved electronic means for carrying out algebraic calculations
GB1038770A (en) Improvements in adders
GB1143203A (en) Improvements in or relating to calculating machines