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Scientific Item Detail
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Item #

A3794

1957 IBM Hexadecimal Computer Calculator

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V020616

Price $

375

This is a rare IBM Hexadecimal Computer Calculator to debug machine program failure used in the 1960s and includes original stylus in excellent condition.  The IBM 360 machines were Hexadecimal machines (0 to 9 and A, B, C, D, E & F memory addresses).  It was used to calculate program entry point and computer software failure for Operating System and Programs.  That is, when a computer program started at entry point of 1A4B and computer failed at memory location 2B36, the exact memory location failure could be calculated.  It shows a 4 digit read out of the 1960s era for a 4-byte word or memory location.  It is labeled “IBM Field Engineering Division – Hexadecimal Adder, part number 229-3168”.  It has original Stylus that fits in side of calculator.  Calculator measures 9” x 3” x 1”.  On back is US Patent Number 2,797,047.  A recent Email from R. P. Holsclaw states “As an IBM FE, a tear came to my eye when I saw your IBM Hexadecimal Calculator.  Back in the 1960s, I was issued one of these and used the calculator to help navigate our way through memory dumps to diagnose problems.  An IBM programmer named Carl J. Lombardi was the originator / inventor of the idea for this Hex Calculator.  On his office desk, he still had the wooden prototype unit that he had built in his home shop in the 1950s.  He used this to demonstrate the Hex numbering system to people at IBM and the Sterling Plastics company, who were later given the contract to make this calculator for IBM”.  This calculating machine is in excellent operating condition and will highlight any museum collection or serious computer collectors of 40+ years ago.

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