One of the biggest advantages over the 6502 was the ability to work with 16-bit registers. X and Y were 16 bit, and a user/local stack pointer was added, U. Even the A and B accumulators could be combined into one 16-bit register, D.
It's one of my favorite architectures. You could do a hell of a lot with very little room.
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I spent many years working with the 6809.
One of the biggest advantages over the 6502 was the ability to work with 16-bit registers. X and Y were 16 bit, and a user/local stack pointer was added, U. Even the A and B accumulators could be combined into one 16-bit register, D.
It's one of my favorite architectures. You could do a hell of a lot with very little room.