GB1192372A - Improvements relating to Digital Computers - Google Patents

Improvements relating to Digital Computers

Info

Publication number
GB1192372A
GB1192372A GB2312867A GB2312867A GB1192372A GB 1192372 A GB1192372 A GB 1192372A GB 2312867 A GB2312867 A GB 2312867A GB 2312867 A GB2312867 A GB 2312867A GB 1192372 A GB1192372 A GB 1192372A
Authority
GB
United Kingdom
Prior art keywords
instruction
execution
count
zero
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
GB2312867A
Inventor
Ronald Threadgold
Orran Terence Pate
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB2312867A priority Critical patent/GB1192372A/en
Publication of GB1192372A publication Critical patent/GB1192372A/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
    • G06F11/36—Preventing errors by testing or debugging software
    • G06F11/362—Software debugging
    • G06F11/3648—Software debugging using additional hardware

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Advance Control (AREA)

Abstract

1,192,372. Digital data processing. PLESSEY CO. Ltd. 15 May, 1968 [18 May, 1967], No. 23128/67. Heading G4A. Programme execution in a digital data processing device is stopped on reaching a predetermined instruction address. Towards the end of execution of the current instruction in a microprogramme-controlled computer, the next instruction is read from store and the instruction count is incremented by one in preparation for accessing the nextbut-one instruction. However if manual switches are suitably set, execution of the current instruction in each case is followed by execution of two further instructions (not from the store) before execution of the " next " instruction. The first further instruction decrements the instruction count by one, and the second further instruction (which is actually set up on the manual switches) obtains the difference between the new instruction count and an address field of the second further instruction, and if this difference is zero the computer stops. If non-zero, the " next " instruction referred to is performed, and so on. The second further instruction increments the instruction count by one to cancel the decrementing done by the first further instruction. The invention may be applied to the system of Specification 1,192,371 which is referred to.
GB2312867A 1967-05-18 1967-05-18 Improvements relating to Digital Computers Expired GB1192372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2312867A GB1192372A (en) 1967-05-18 1967-05-18 Improvements relating to Digital Computers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2312867A GB1192372A (en) 1967-05-18 1967-05-18 Improvements relating to Digital Computers

Publications (1)

Publication Number Publication Date
GB1192372A true GB1192372A (en) 1970-05-20

Family

ID=10190586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2312867A Expired GB1192372A (en) 1967-05-18 1967-05-18 Improvements relating to Digital Computers

Country Status (1)

Country Link
GB (1) GB1192372A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306644A2 (en) * 1987-07-06 1989-03-15 Hitachi, Ltd. Data processor having a break function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306644A2 (en) * 1987-07-06 1989-03-15 Hitachi, Ltd. Data processor having a break function
EP0306644A3 (en) * 1987-07-06 1990-06-27 Hitachi, Ltd. Data processor having a break function

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees