Notebook containing handwritten notes on testing delay line characteristics. The notebook was originally used in Sydney and was brought to Melbourne.

Page 49 contains the first (in the book) handwritten notes by Jurij Semkiw. He was listing some tests on the C. I. S. (completed instruction 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 delay 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.

Physical Description

Grey Cardboard covered book with red spine with lined pages. Handwritten text written throughout book. Loose piece of paper interleaved between pp 116-117. Loose piece of paper inside back cover.

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