I used to play around with these (ST20 core) when I was younger, they were embedded into the STMicroelectronics STi5518 set top box chips, which I happened to have the full datasheet to. A weird stack based architecture, each instruction was a single byte if I remember correctly. And it had a hardware scheduler. Because of the stack based architecture, the task switch was very fast indeed.
There also was an ANSI C compiler (from the 1980s) with source code available, and I managed somehow to get this to build on a Linux machine at the time.
I got most of the peripheral hardware working, could even display MPEG-2 still images and play MP3 files streamed over the JTAG interface. But I never got full video decode working. You could also overclock it to 180MHz, which is much faster than it's specified 81MHz clock rate.
The last chip that STMicroelectronics manufactured which featured a transputer core is STi5119ALC. It runs at over 200MHz and supports VGA RGB progressive scan output. You can get it from AliExpress, so it shouldn't be too hard to get a board made with the chip and a DDR SDRAM for experiments. I think the STLink (which is a modified transputer link) even works, so you can chain the chips together.
There also was an ANSI C compiler (from the 1980s) with source code available, and I managed somehow to get this to build on a Linux machine at the time.
I got most of the peripheral hardware working, could even display MPEG-2 still images and play MP3 files streamed over the JTAG interface. But I never got full video decode working. You could also overclock it to 180MHz, which is much faster than it's specified 81MHz clock rate.
https://www.datasheetcatalog.com/datasheets_pdf/S/T/I/5/STI5...
The last chip that STMicroelectronics manufactured which featured a transputer core is STi5119ALC. It runs at over 200MHz and supports VGA RGB progressive scan output. You can get it from AliExpress, so it shouldn't be too hard to get a board made with the chip and a DDR SDRAM for experiments. I think the STLink (which is a modified transputer link) even works, so you can chain the chips together.