This article is more than 1 year old

Auctioneer puts Space Shuttle CPUs under the hammer

IBM kit made 20 journeys into space, now selling for surprisingly down-to-Earth prices

Boston-based auction house RR Auction currently has an out of this world item up for bid: IBM computers collectively used aboard twenty Space Shuttle missions.

Between 1981 and 1991, NASA used computers with separate CPU and IOP (input/output processor) components. The CPU and IOP on offer saw the insides of the Columbia, Challenger, Discovery and Atlantis shuttles, including four missions they flew together. In 1991, two-piece general purpose computers (GPCs) became obsolete and NASA upgraded to single units.

The kit on offer appears to be an IBM model AP-101, a device that NASA historians rate as capable of handling "up to 2,048 microinstructions, 48 bits in length."

As IBM tells it, the machines "used the basic instruction set architecture from IBM's mainframe System/360" and could process 480,000 instructions per second.

Space Shuttle General Purpose Computer

The AO101 units. Click to enlarge

Thanks to modifications made after the loss of Challenger in 1986, the manufacturing date on the units is 1988. The CPU counter indicates it has given up 4,104 hours of operating time and comes with a "flown hardware" tag. The IOP hours meter is covered with silver tape. Both have inspection seals indicating that they are complete and intact.

Both have IBM/Rockwell tags and circular ports on their backs to connect to airducts.

The systems were one of five pairs in the Space Shuttle Orbiter – four operated in sync and the other used to run backup software.

RR Auctions points out that at the time the units flew, they were the brains of the most technologically advanced spacecraft to ever take flight.

Of course, the 10" x 7.5" x 22.5" (25.4cm x 19cm x 57cm) units look a little quaint these days – but that hasn’t stopped them from attracting almost $10,000 in bids at time of writing. The auctioneer expects that to top $50,000 by time the auction ends on April 22.

The auction house has sold other space type stuff before, including a watch worn by Commander Dave Scott on the Moon during the Apollo 15 lunar landing. That item went for over $1.5 million in October of 2015.

A rare lunar meteorite went for $612,500 in 2018.

And as for the value of obsolete vintage tech, consider that a functioning Apple 1 Computer from 1976 sold for $375,000 in September 2018.

In November, another auction house, John Moran Auctioneers, sold a super-rare wooden Apple 1 for $500,000. ®

More about


Send us news

Other stories you might like