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Coincidentally I just embarked on learning about the 6809 architecture. I became interested in the architecture after discovering a generation of synthesizers,
by ajxs 6y ago
Coincidentally I just embarked on learning about the 6809 architecture. I became interested in the architecture after discovering a generation of synthesizers, such as Yamaha's DX line or Ensoniq's ESQ-1/SQ-80, in the mid 1980s were built around CPUs using it. I've been disassembling the freely available Operating System ROMs in an attempt to learn more about how these devices were programmed. The differences between the 6809 and modern architectures makes for some interesting learning!
- retrac 6y ago> The differences between the 6809 and modern architectures makes for some interesting learning! Funnily enough, the 6809 is by far the most "modern" 8-bit design. It was the last major one, released after the Intel 8086 and some other 16 bit designs. Stack-relative addressing (with two stacks!), position-independent code, 16 bit arithmetic, hardware multiplication, and high code density. Very nice compared with the likes of the Z80 or 6502.