À¶Ý®ÊÓƵ

The is a that we believe is from À¶Ý®ÊÓƵ’s very own IBM 1620. A memory board works by threading small rings, called toroids, together to form cores. Each core holds one bit of data, andÌýthe core pictured is 50x80, indicating that it holds 4000 bits of data. To store data, each core is magnetized in either a clockwise or counterclockwise direction, which the IBM 1620 reads as binary. When not being used the core stores the last value assigned, allowing the data to be kept without constant power use.

This artifact was donated to us by Professor Peter Buhr.

The was marketed as an inexpensive scientific computer in 1959. On April 17, 1961, the IBM 1620 arrived at À¶Ý®ÊÓƵ. The university rented the computer in monthly installments of $672.00, and finally purchased it in 1963. The 1620 was available between 9am-11pm and was widely used by all . ÌýÌý

One of our readers pointed out the following:
Ìý

"Actually, the memory board shownÌýon these pages is not from an IBM 1620. The main memory in the IBM 1620 had core planes withÌý10,000 cores arranged in a 100x100 grid. As mentioned in the description, the board shown has 4000 cores arranged in a 50x80 grid, therefore not from a 1620. (To be complete, the 1620 also had boards with 16x24ÌýcoresÌýand withÌý10x10 cores. ObviouslyÌýthe board shown is neither of those.)

So what is your board? I can't see anything in the picture that says IBM, but assuming it is an IBM core memory board, I would hazard a guess that it is a main memory board from an IBM 1401 computer. The 1401 used core memory boards of the exact size shown:Ìý50x80. While it's always possible that boards of this size were used inÌýother equipment as well, the 1401Ìýseems the most likely source forÌýa board of this size.Ìý

I hope this information aids inÌýcorrectly identifying the artifact shown. I was an avidÌýuserÌýof bothÌýthe 1620 and the 1710 at the University of À¶Ý®ÊÓƵ between 1970 andÌý1975."

As the saying goes "further research is required"!

Charlotte Wipp is a Physics and Astronomy student currently in her 2B term at À¶Ý®ÊÓƵ. She enjoys tinkering and creating all forms of art in her free time. She works at the Computer Museum as their current Winter 2024 coop student. Ìý