No, I haven't checked that.exxos wrote: ↑Tue Mar 30, 2021 2:11 amthe MSTE boosts to 16mhz which means other cpus won't likely work. But if the CPU works in a STE then its unlikely to be damaged. Even so, the CPU in the store may help, but assume not.
Have you checked the bus resistors? In that you get 10k pull up on most CPU pins?
Are these the two resistor arrays on page 2 of the Mega STe schematic that go to "Data <15:0>"?
I'm guessing there are others too, connected the same way, hidden somewhere in the schematic as there weren't any surrounding the CPU itself (page 1).
So I check the resistance between the CPU PLCC-socket pins and +12V to see if there a 10K resistance?
Should I remove the CPU from the socket first, before measuring?
I'm also going to check for continuity from each CPU PLCC pin and to where the signals are supposed to go elsewhere. A cold solder joint or fracture isn't unlikely in this area since I've messed around with the MonSTer board a lot.
The inside pins (going to the CPU itself) have all been bent inwards to ensure a good connection. I've also checked for any damaged or bent pins on the CPUs I've inserted.
EDIT: I've done a quick check using the method I guessed above (checking for resistance between +12V on the PSU (of course with power turned off!) and the various CPU pins (but I didn't remove the CPU from the socket), and indeed: several of the pins read around 10K. But there were other lines reading 2K and 5K as well as completely different values. You said "most" CPU pins, so I assume this may be right, but when I have some more time on my hands I'll take a more thorough check, noting which pins have which value (and maybe I should have removed the CPU first as well).