[rvense]

Impressive work! Of course you can access external RAM, but it comes with some compromises re: speed and usability. Other ARM microcontrollers have a full SDRAM controller on board in its normal address space with very little overhead compared to the internal memory. I'd imagine the SPI RAM here is an order of magnitude slower than the internal RAM, if not two?

edit - that is one WILD codebase... it has both pi pico support but also (remnants of)... Mac OS 9 support!? `#ifdef __MWERKS__`??

[lproven]

Oh, yes, it's a crazy project overall. I would love to see it continue -- I think the Transputer and its OS HeliOS, which is FOSS now -- still has much to teach. But he got it working, so I can also see why not stop digging if you hit the bottom.

P.S. I wrote about HeliOS too:

https://www.theregister.com/2021/12/06/heliosng/