A couple of Enterprise Hewlett Packard attendants were sent to the International Spa Center in August 2017 while a test has yet to come back to the Earth, three months after their return.
Together, they comprise the Spaceborne Computers, a Linux system that has a computing processing power.
They were set up to find out how sturdy they would be in the room with little specialist treatment.
After 530 days, they are still working.
Their flight was disconnected away unsuccessfully, after a Russian rocket failed in October 2018.
HPE's high content architect Adrian Kasbergen said they could return in June 2019 if there is a plane on the plane but "currently they do not have a ticket".
The company works with Nasa and Elon Musk's Space X to be "ready for a computer" for its & # 39; The first time in Mars, which is considered to be & # 39; place around 2030.
Currently, the 20-year-old devices on the ISS return data to Earth to operate but it can take 30 minutes for the travel data each route.
It is unlikely that it will be possible to restore information to Earth for processing from Mars, as it is billion millions of miles away.
The three original ISS board computers were priced at $ 8m each and took 10 years for construction, Mr Kasbergen told BBC News.
"Our servants cost thousands, instead of millions of dollars," he said, a & # 39; Speaking at the World Mobile 2019 (MWC) Congress in Barcelona, where HPE is a replica of the Destiny ISS module.
The Spaceborne Computers is currently based in the top of the real thing, Mr Kasbergen said.
The servers needed a special change. The air cooling system would not work in a place.
And, Mr Kasbergen said, they had unexpected problems with their power supply as well as the strong driver who supports the main hard drives.
But the machines needed to review the Earth to find out what was wrong.