Written/ hardcopy computer program titled 'OCTAL DEBUGGING PROGRAM'. DECUS Program library number 8-57. January 1967. Author: B.J.Biavati. Digital Equipment Corporation.Published by the Digital Equipment Computer Users Society.

Abstract: A monitor program which executes in the user's program one instruction at a time, as each instruction is carries out the contents of the program counter, the instruction, the contents of the accumulator and link of the effective address are reported by means of the ASR-33 teletype. Full source code listing supplied.

Additional sheet: Letter from program's author to Alan Head ( CSIRAC programmer and Chief of Division at CSIRO ), agreeing that there was a programming error.

The Digital Equipment Computer Users Society (DECUS) was set up by early users of the PDP-1 computer, which was manufactured by Digital Electronic Corporation (DEC), in Massachsetts, United States of America. The creation of DECUS was driven by the need to share information and computer programs for the PDP-1. One of the key reasons was that early users had to write their own software; DEC initially sold only hardware. Set up in 1961, DECUS grew to be one of the largest international societies of computer users in the world.

Physical Description

Portrait format paper which is printed on both sides, or one side only, and stapled together in the top left hand corner. The front cover has the Decus Program Library name and logo printed in blue in the top register of the page. The booklet number, title, author, company, date and format are also listed in the front cover. The information is presented in text format only and is printed in black ink.There are several loose sheets attached/ stuck in the paper.

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