Ha! Just seeing the "welcoming newcomers to the 6502 world" topic made me feel welcomed. I'm pretty new to 6502 programming, but not to C, Python, or pretty much anything higher level than assembly. Back in March, a friend of mine recommended I get into the 6502 and so I started down this road. It's ...

Ha. I kept hoping it was the code! That’d be the easiest to fix. Meanwhile. I’m gonna keep digging!

The math again:

GOLO: LDA (2)
STA (4)
Delay (491)

' Delay Loop:
LDX (2)
DX: DEX (2)
BNE (3 or 2)
JMP (3)

GOHI: LDA (2)
STA (4)
Delay (491)

So, just focusing on the delay loop:
2 for LDX
5 for each iteration (except for the last, which is 4)

This is 2 + 5N-1, or 5N+1...

Between each ...

What I find interesting is that the clock signal is dead on and seems to be measured accurately, whereas the hi/lo is off...

It looks like the regulars here do now know the PAL-1 system.

And a beautiful thing it is, too! Hi Hans. Yours looks so much cooler than mine :wink: . I'm off to checking measurement error cuz I'm pretty sure the code's ok (not stylewize, but cyclewize). I will also do a quick rewrite with a ...

Welcome! Those I/O addresses seem familiar to me. By any chance are you running the code on a KIM-1? :)

I haven't counted up your clock cycles, but I did reformat your code slightly, and it's apparent that the HI loop and the LO loop have virtually identical instructions. (BDD, I'm sure the ...

All,

I'm new to 6502 programming. I bought a PAL-1 and I'm learning about 6502 programming and microprocessors. In the process, I found and read Don Lancaster's Micro Cookbooks... great books for folks like me, who never did any hardware or low level programming, btw. Anyway, one of the problems he ...