Nice! My work was 6510 machine language, hence all the "coding in decimal" -- using mneumonics to _write_ my code (ie: "lda" for "load the accumulator") didn't

Nice! My work was 6510 machine language, hence all the "coding in decimal" -- using mneumonics to _write_ my code (ie: "lda" for "load the accumulator") didn't occur to me, and neither had using hex. Using assembly (lda vs whatever the decimal equiv was) wouldn't have made sense anyway, since I didn't have an assembler -- I just POKEd all my code into memory. Then I'd (typically) hijack the keyboard interrupt (with the final call in MY code to the real kb handling code) and my code would run -- things like switching screen colours everytime you pressed a key. But I learned about looping, conditions, CPU program counters, registers, flags, boolean logic, memory addressing... Good times.