Shipping was £12 for 3 chips, 2 x W65C02S and 1 x W65C22S

Cool thanks Ed. I was pretty happy with my purchase from Mouser so I'll probably stick with them if I order more chips in the future

I'm in UK and I believe mine came from Germany, so not sure where Jameco are based or if their shipping would have been cheaper. I actually ordered 2 buy accident so I have one spare as well ^_^ Just picked up a BBC Micro to fiddle around with as well

I'll definitely read more in Garth's primer, finding it really interesting so far and not having any experience with CPUs, i'm learning a lot

Yeah I know what you mean about parts of eBay, had a few dodgy items in the past but I bought the 65C02 from Mouser to make sure it was genuine.

Okey, well as this is just an educational thing for me to learn a bit more, I'll take a look into how single-stepping works with RDY and SYNC and try and implement that instead :)

Thanks for the information, this also led me to look up the different types of 74-series logic chips so now I have a ...

I just looked back over Garth's clock generation page and he has this circuit on there which approximately generates a 1uS pulse:

http://wilsonminesco.com/6502primer/SingleCyClk.jpg

This is just fed into the normal clock input though unlike what you're suggesting so would this be suitable? I've ...

If that is what is causing the problem, it seems strange that it is randomly 'glitching' in the way that it is even when the clock is held steady.

But thanks for pointing that out, I'll try a different way of single stepping the CPU and see if that fixes it

I've disconnected the display at the moment while I build a different one that will run off the same power as the CPU rather than the Arduino power but once that's done I shall check while watching what the display does.

Here's the video if it's any help...

http://www.youtube.com/watch?v=1ttkqt5n6SA

If only this was during term time, I could use my University's oscilloscope to take a look at the signals and timings and such but being a poor student I don't have that luxury :P

I'll try and reconstruct the single-shot circuit over the weekend and see if that cures the problem. Either way I shall ...

No memory or program at the moment, I've hard wired NOP commands to the data bus which IIRC was 0xEA, so after the start up sequence, it should look for memory location 0xEAEA, which will then mean that it reads NOP commands from the spoofed memory by hard wiring the data bus.

I can increment the ...

According to the WDC datasheet, there are 3 clock pins:

PHI1O - Phase 1 Out Clock
PHI2 - Phase 2 In Clock <--- which I assumed was the clock input for an oscillator. If I were using a crystal I would have connected it up to PHI2O as well as PHI2
PHI2O - Phase 2 Out Clock

I read your primer and ...

Oh sorry, it is a 16 bit bus, but my current display setup only shows 8 bits at a time so I've only got it hooked up to the least significant 8 bits, but i've also tested it on the most significant 8 bits and the same thing is happening.

It's a genuine WDC 65C02S

Hi everyone.
This is my first venture into a home built computer (or even just powering up a standalone CPU) so I'm probably going to make plenty of mistakes ^_^

One thing I've come across having just finished connecting everything up and adding power is that the address bus is alternating between ...