transputer boards – A collector and former university user is dusting off original transputer hardware, including an Occam-programmed T400 and a newly acquired four-processor board built around T425 chips made by ST in 1999—long after the transputer project was halted.
Some hardware doesn’t just get collected. It waits.
For [Lance Harvie], the wait has been measured in years—and, lately, in late-night searches for adapters. His transputer-era setup traces back to his university years. when he used stand-alone transputer computers networked together to chase task-level parallelism. He still has that original gear, and he’s now been expanding it after a recent eBay purchase.
The starting point is a board featuring the T400. On it, he remembers programming in the Occam language. The board is still there; the bridge back to a modern life isn’t. He’s currently looking for an ISA-to-USB adapter so he can connect it to a modern PC and power it back up.
That search led him to something bigger: a four-processor transputer board on eBay, containing four T425s. By comparison with the T400, the T425s are significantly more powerful. The newer chips also support external memory, which changes what you can do with the system once it’s running again.
The board is built for a particular kind of use. It omits the external serial links that you might expect from a more interconnected transputer network. That omission isn’t a compromise—it’s the point. The design is meant to serve as a stand-alone four-unit transputer system in setups like a scientific instrument. with the board’s available four serial links per processor connected directly on the PCB.
And then there’s the detail that makes the whole story feel like a small historical miracle: the processors on this board were manufactured in 1999 by ST. That’s many years after transputers stopped being developed.
The reason, [Lance] explains, points back to the UK’s semiconductor story. The UK government pulled the plug on the transputer project. The IP didn’t vanish; it ended up at ST, which continued producing the chips until 1999 at its Philippines plant.
Now, [Lance] is working toward the moment collectors dream about: getting everything powered up and using it again together—this time in combination with a modern-day Linux-based computer. He’s aiming to bring the hardware back online for real use, not just display.
There’s also a broader reminder tucked into his plan. Sure. modern makers can use random MCUs as transputer modules or link chips. with SPI often acting as a fast alternative for high-speed serial connections. But there’s something different about using the original hardware—the thing that was built for this architecture in the first place.
An old parallel computing idea didn’t disappear cleanly. It was stalled, repackaged, and eventually manufactured long after its creators had moved on. In [Lance]’s workshop, that history is about to become electricity again—if the right adapter shows up in time.
transputer T400 T425 Occam eBay purchase ISA-to-USB adapter ST 1999 Linux-based computer retro computing parallelism scientific instrument hardware
So is this like Bitcoin mining on old computers or what?
I don’t get why they need an ISA-to-USB adapter, can’t they just plug it into anything? Also eBay always has weird stuff like this.
Wait, the article says it omits external serial links on purpose, but then it still has serial links per processor on the PCB… so is it actually connected or not? Sounds like they built a science instrument but nobody can run it anyway without the right adapter.
This is kind of wild that ST made transputers in 1999 when everyone thought it was “halted.” Makes me feel like half the tech stories are just “forgotten” not dead. I bet it would be faster than my current laptop if you just threw in the right memory or whatever, unless the power adapters are impossible to find. Also Occam language sounds like it should be easy??