The CH554 is a microcontroller with an E8051 core with a 24 MHz clock, a little more than 1 kB of RAM, and a bit more than 14 kB split between the code and data Flash.
I think that qualifies as "relatively powerful" when compared to a Z80 or 6502. :-)
I do agree that the lack of such adapters is due to zero market demand though.
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From your link:
I think that qualifies as "relatively powerful" when compared to a Z80 or 6502. :-)
I do agree that the lack of such adapters is due to zero market demand though.