exxos's Atari, Amiga & retro forum

Just a quick question - does anyone have any suggestions when these clock fix boards don't work on a Falcon?

I've all but given up and reverted back to the pull down / termination resistor I added in part 2 of my videos on the Falcon. I tried Edu's board previously - that wouldn't work at all (like the clock was messed up). Today tried Exxos latest board which I bought last week - that does work in that the Falcon boots and runs normally, however the DMA issue is there - just like it was before any fixes were done. ie. When using CT60e Quake freezes on loading, Demos freeze when loading etc. Removed the mod and fitted the termination / pull down again, and it's back to working 100%

I give up lol

My fix fixes all known issues. But did you notice there was a update recently to fit a 100K resistor ? also assume you have recapped the power supply and on no other modifications to it ? I also assume you actually followed the fitting instructions, some people start to " have their own ideas" on how to fit it and always end up in trouble :roll:

You did not stay which position you had the jumper in, see March 21, 2019 update

https://www.exxosforum.co.uk/atari/last/ ... /index.htm

100K fix is JUNE 1, 2021 - MODIFICATION.

exxos wrote: 27 Aug 2021 20:52 My fix fixes all known issues. But did you notice there was a update recently to fit a 100K resistor ? also assume you have recapped the power supply and on no other modifications to it ? I also assume you actually followed the fitting instructions, some people start to " have their own ideas" on how to fit it and always end up in trouble :roll:

You did not stay which position you had the jumper in, see March 21, 2019 update

https://www.exxosforum.co.uk/atari/last/ ... /index.htm

100K fix is JUNE 1, 2021 - MODIFICATION.

It's using a mini ATX PSU, ruled out that by trying another 2 different PSUs. Didn't see a jumper mentioned in the instructions on the website there. Will take a look at the 100K resistor.


EDIT: I see the article further down about the jumper and the resistor. It's perhaps worth mentioning those at the top of the install instructions as it's not obvious.

GadgetUK164 wrote: 27 Aug 2021 21:00 It's using a mini ATX PSU, ruled out that by trying another 2 different PSUs. Didn't see a jumper mentioned in the instructions on the website there. Will take a look at the 100K resistor.

I also suggest you take out the CT60 and run it as a stock machine and get that stable first.

Also have you run programs like DMA2DSP.PRG ?

exxos wrote: 27 Aug 2021 21:09

GadgetUK164 wrote: 27 Aug 2021 21:00 It's using a mini ATX PSU, ruled out that by trying another 2 different PSUs. Didn't see a jumper mentioned in the instructions on the website there. Will take a look at the 100K resistor.

I also suggest you take out the CT60 and run it as a stock machine and get that stable first.

Also have you run programs like DMA2DSP.PRG ?

Yes - it's definitely DMA related. I will have another go with that jumper and that 100K resistor at some point.

GadgetUK164 wrote: 27 Aug 2021 21:17

exxos wrote: 27 Aug 2021 21:09

I also suggest you take out the CT60 and run it as a stock machine and get that stable first.

Also have you run programs like DMA2DSP.PRG ?

Yes - it's definitely DMA related. I will have another go with that jumper and that 100K resistor at some point.

I am highly confident the 100k resistor should solve your issue. We've had a couple of Falcons that have needed that on the forum recently. Do that first, before playing with the jumper. Then play with the jumper if you still need tweaks.

Success - Just need to test over cold / warm cycles, but looks like the 100ohm resistor sorted it!!!

Thanks @ Exxos =D

GadgetUK164 wrote: 28 Aug 2021 13:54 Success - Just need to test over cold / warm cycles, but looks like the 100ohm resistor sorted it!!!

Thanks @ Exxos =D

Cool.. Assume you mean 100k ? Not sure 100R would even boot. :dualthumbup:

exxos wrote: 28 Aug 2021 14:42

GadgetUK164 wrote: 28 Aug 2021 13:54 Success - Just need to test over cold / warm cycles, but looks like the 100ohm resistor sorted it!!!

Thanks @ Exxos =D

Cool.. Assume you mean 100k ? Not sure 100R would even boot. :dualthumbup:

That's correct - 100uF :lol:

Lots of testing later - all OK! Great board that Exxos!!! Awesome work!