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Schematic Diagram - CSIRAC Computer, 'C.I.S', SKE5179, 1948-1955 Document Reg. No: HT 13519 4

Summary:
Schematic diagram in hard copy relating to the computer CSIRAC.

C.I.S. is the abbreviation for Completed Iinstruction Store. This stored the sixteen instructions that have just been executed. It is a diagnostic tool for seeking the cause of an error. It allows the operator to review the last sixteen instructions leading to the error.

A single delya line was dedicated to this purpose. The sixteen instructions were shown on the cathode ray screens on the console.

The emulator developed by John Spencer includes the C.I.S.

A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common components were vacuum tubes (valves), capacitors and resistors. Schematic diagrams are also known as circuit diagrams.

C.I.S. stands for Completed Instruction Store.

Technical details:
Schematic Diagram. Subsystem: Control
Pencil, Drawing Size B
Acquisition Information:
Donation from University of Melbourne (The) Computer Science & Software Engineering Department
Discipline: Technology

More information

Tagged with: computing, csirac computer, first generation computers, mainframe computers, making history - csirac
Themes this item is part of: CSIRAC Drawings & Diagrams - An Overview, Information & Communication Collection, CSIRAC Collection, Archival Paper Tape Reading Project for CSIRAC 12 Hole Paper Tapes
Primary Classification: COMPUTING & CALCULATING
Secondary Classification: Digital Computing
Tertiary Classification: drawings
Commissioned By: Commonwealth Scientific & Industrial Research Organisation (CSIRO) Division of Radiophysics, Sydney, New South Wales, Australia, 1948-1955
Collector: CSIRAC History Team, Melbourne, Victoria, Australia, 1995 or later

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