Is it a significant hardware upgrade to the propeller 2? (i.e faster and more ram??), The BB project sounds interesting too. A completely different processor is probably out of question due to chip pin out or possibly even size ? As one that enjoys using my 6804 and 682, be interested to see changes too.
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If you go ot the website https://www.parallax.com/microcontrollers/propeller you can see information about propellor processors. the new propeller is more advanced, but also more expensive, so controllers will be more expensive too. this is not a surprise as we are many years after the first propellor came on the market. The first propeller is doing a great job in the sandevices controllers, but at the edge of its capabilities with all the new demands asked for in this forum. I, as a technician, can imagine how much effort implementing the propeller 2 will be for a designer. if Jim is considering that, we may surely give him a lot of respect for that. But he is not the youngest amongst us, so it might be to much effort for him.
best regards
Dick de Wit
The Netherlands