exxos's Atari, Amiga & retro forum

exxos wrote: 26 Apr 2021 15:31 I'm not sure I follow how you got for a bad mouse cable to blowing up CPUs ?

The mouse is wireless :)

He's saying its the power profile of the cable and the voltage drop across it that was the problem from what I can see.

I thought Exxos was joking :lol:
Mouse was on the picture to give a scale comparison with the cable.

olivier.jan wrote: 26 Apr 2021 16:01 I thought Exxos was joking :lol:
Mouse was on the picture to give a scale comparison with the cable.

honestly I am not following at all.. How does a wireless mouse kill CPUs ? mouse has to go through the keyboard controller chip, then the ACIAs before getting to the CPU...

Power wise, if that thin cable was shorting out the power, a couple of amps would probably melt it and set it on fire.. Worst-case power supply fuse blows, again how does this kill a CPU ?

exxos wrote: 26 Apr 2021 16:06

olivier.jan wrote: 26 Apr 2021 16:01 I thought Exxos was joking :lol:
Mouse was on the picture to give a scale comparison with the cable.

honestly I am not following at all.. How does a wireless mouse kill CPUs ? mouse has to go through the keyboard controller chip, then the ACIAs before getting to the CPU...

Power wise, if that thin cable was shorting out the power, a couple of amps would probably melt it and set it on fire.. Worst-case power supply fuse blows, again how does this kill a CPU ?

The mouse was innocent!

Forget this poor mouse.
The cable on the picture was the cable between the bench PSU and the Atari power connector but the cable was too thin, so 5.13V at the PSU was actually 4.6V on the Atari. Using a bigger cable fixed the issue by reducing the voltage drop to something minimal.

olivier.jan wrote: 26 Apr 2021 16:33 Forget this poor mouse.
The cable on the picture was the cable between the bench PSU and the Atari power connector but the cable was too thin, so 5.13V at the PSU was actually 4.6V on the Atari. Using a bigger cable fixed the issue by reducing the voltage drop to something minimal.

ahhhh.. Yep that cable sux :lol:

olivier.jan wrote: 26 Apr 2021 16:33 Forget this poor mouse.
The cable on the picture was the cable between the bench PSU and the Atari power connector but the cable was too thin, so 5.13V at the PSU was actually 4.6V on the Atari. Using a bigger cable fixed the issue by reducing the voltage drop to something minimal.

Don't know why you had the issue. I use a similar inadaquite on my H4's and H5's. You adjust the voltage at the power connector on the board for 5.00 volts. The resistance of the cable is pretty much consistent so it will vary around 5.00 volts due changes in current demand but its minimal. The worst variation I saw on mine was 7 mv which is well within the 5v tolorence. As I recall I had a 17 mv drop in the cable under normal operation. I don't understand how you burned cpu's? :fire: