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I learned assembly on a TRS-80 Color Computer (6809 CPU.) Interactions with the machine were fairly straightforward.

The 6809 was a joy to program in assembly language. I enjoyed some aspects of Z80, and loved the puzzle of getting things done with 1802 and 6502, but 6809 was, for me, the sweet spot.

Two stack pointers, one for call/return, the other for push pop data.

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