exxos's Atari, Amiga & retro forum

sandord wrote: 04 Oct 2018 17:38 I'm crying right now. Metrocross is showing bad pixels again. I guess that the wire made the ST only stable at half speed...

What voltage is your PSU outputting ? and what is it, like SR98 ?

exxos wrote: 04 Oct 2018 17:42 What voltage is your PSU outputting ? and what is it, like SR98 ?

It's an SR98, Exxos-kit-capped a few weeks ago.

During the recap, I put it under load using two power resistors (3R3 and 22R) and tuned it to 5.01V. Next, I put some glue on the pot to prevent it creeping up or down.

I just measured it while it was running in the ST and found it was running at 5.23V! Whoops. Perhaps the pot had crept after all?

I just tuned it to 5.05V under dummy load. Then I put the psu in the ST and it's running Metrocross now. The multi meter is still connected so I can monitor the voltage.

Have you tried upping the voltage to 5.20V ? And just see if the machine runs at that ?

exxos wrote: 04 Oct 2018 18:44 Have you tried upping the voltage to 5.20V ? And just see if the machine runs at that ?

It has been running at 5.23V for the past few weeks already. I'm now trying what happens at 5.05V.

sandord wrote: 04 Oct 2018 18:47 It has been running at 5.23V for the past few weeks already. I'm now trying what happens at 5.05V.

ah right, it should be set to 5V ideally, but most ST's seem to end up running a faction lower voltage, like 4.8V - 4.9V.

exxos wrote: 04 Oct 2018 18:52

sandord wrote: 04 Oct 2018 18:47 It has been running at 5.23V for the past few weeks already. I'm now trying what happens at 5.05V.

ah right, it should be set to 5V ideally, but most ST's seem to end up running a faction lower voltage, like 4.8V - 4.9V.

Ah, so better a tad below 5V than over.

The ST's been running YAART beta for 9.5 hours, no errors. Punish Your Machine Reset demo for one hour: no crash. Metro Cross: no bad pixels. This is looking good! Will run some more tests tonight.

sandord wrote: 05 Oct 2018 10:07 Ah, so better a tad below 5V than over.

The ST's been running YAART beta for 9.5 hours, no errors. Punish Your Machine Reset demo for one hour: no crash. Metro Cross: no bad pixels. This is looking good! Will run some more tests tonight.

cool! I think you just got noise on the RAM lines. Ringing would get worse higher the voltage and cause more errors.

After:

- 9.5 hours of YAART
- a few hours of Full Screen Demo from the Cuddly Demos
- an hour running the Reset Demo from the Punish Your Machine demo
- and a few games of Metrocross and

I can finally say: IT'S FIXED! :cheer: :cheer: :cheer:

You sure this time :P

:thumbup:

exxos wrote: 05 Oct 2018 19:04 You sure this time :P

:thumbup:

I'm afraid I'll have to eat my hat if I'm wrong 😝