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I wish 68k, but it's out of production (as is the 6809, its equally awsome 8-bit cousin).

MIPS and ARM are fun, though, AFAICT. As is 6502.

If you want something friendly and CISC-y and modern, check out the Renesas RX600 and friends. They have a nice instruction set and zero-wait-state RAM and ROM, so writing assembly by hand with predictable timing ought to be easy.

https://www.renesas.com/en-us/doc/products/mpumcu/doc/rx_fam...

Hey. Neat. Thanks for the link.

(author here) ...FYI I actually learned assembly language for the first time back in the 1970s and 80s using a 6809 inside a Radio Shack "Color Computer." I was super-fun at the time. I don't remember much of it now but I'm sure x86 isn't as clean or fun as 6809 assembly was.

Spoiler: it wasn't. I've looked over both, and that's pretty immediately clear.

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