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The 6809 seems like a more powerful (16-bit accumulator and index registers, multiply instruction) and orthogonal 6502 (itself a cheaper/simpler 6800) with fewe
by musicale 2y ago
The 6809 seems like a more powerful (16-bit accumulator and index registers, multiply instruction) and orthogonal 6502 (itself a cheaper/simpler 6800) with fewer (possibly charming) quirks?
The 6502 won in the marketplace though, apparently due to its lower cost (the 6809 had nearly triple the transistors.)
It's nice that it's still in production if you want to build a breadboard system.
- quantified 2y agoThe Dragon-P eval board has a keypad, breadboard, and small display. Great for getting close to the metal.
- djmips 2y agoIndeed the 6809 has several 16 bit stack registers as well as 16 bit X and Y index registers which mean you can use proper structures and it even has a decent mul instruction.