exxos's Atari, Amiga & retro forum

I did go through and check all the filter and limit settings, so unless I'm reading the UI incorrectly, I'm pretty sure they're off.

BW

May I ask where you are measuring both signals exactly (ideally with a pic)?

Swissfalcon wrote: 08 Jul 2024 16:11 May I ask where you are measuring both signals exactly (ideally with a pic)?

Across the 47pF cap.


I even run a simulation on the same values as used in the actual circuit...


Is about as close as you're going to get to a actual circuit...


With a extra 100pF which would be more like a X1 probe.. You get this result.. Which is what most other people are seeing..


So for some reason there has to be like 100pF extra somewhere to get those results. Or BW limit on the scope or something. Or people are fitting the wrong parts during installation.. Or there is something different on some peoples falcons somewhere. I really have no idea..

Thanks. I just ordered both patches. I will report what I get with the V4. Don't we have three separated signal to measure? This one is for the DMA, but where do I measure the others one?

Swissfalcon wrote: 08 Jul 2024 16:28 Thanks. I just ordered both patches. I will report what I get with the V4. Don't we have tree separated signal to measure? This one is for the DMA, but where do I measure the others one?

Not sure what other signals you are referring to ?

I assume the FPU ? That is tricky. You have to do it on the back of the cap on the back of the motherboard with some flyer leads probably. Or on top of the FPU socket clock pin. But if people are not seeing the clock as expected on the SDMA, then all the other clocks are pretty much irrelevant at this point anyway.

I assumed that as we have 3 separated wires, the 3 traces has to be measured separately. Ok, got it, I will measure where you pointed, thanks .-)

@Swissfalcon we only measured the SDMA signal because that is the main reason a clock patch is required. The SDMA signal is routed across the entire motherboard, through bends and dog-legs, which causes signal degregation.

ok, thanks for the clarification.

Atari Falcon running JOY demo with exxos clock patch V4 and DFB1X accelerator.

The funny thing is that it is actually impossible to tell - the whole demo runs 50 FPS even on standard Falcon. ;-)