exxos's Atari, Amiga & retro forum

So I just finished soldering up my 2nd board and programmed the CPLDs. When I boot into diagram, it sees the 68030, but it's showing 0 for fastmem.

I double checked the solder joints and i don't see anything wrong.

Is there anything I can check?

Use a fluffy type microfibre cloth to lightly clean the ram and ram cpld. The cloth will snag on an unsoldered leg without pulling it out of shape.
Works a treat :D

So I tried your trick and didn't find any unsoldered legs.

I have an lcd microscope that I got from aliexpress and it works well enough to see the solder joints. I don't see any bad joints. I wonder if I have a bad board, but I'm not sure what to check to see if I have a bad one.

Did you use DiagROM to try scanning 0x200000 to 0x600000 manually?

No! That's the knowledge that I'm lacking. I will try that.

Thanks

It should probably show you which bank is dead.

https://photos.app.goo.gl/9XJWLaSjkjjgFCnC6

So I finally got around to testing this in diagrom. I think I picked the correct start/end address from the memory test.

So it looks like they're all bad? I've checked the solder joints over and over again and they look fine.

something is wrong. Either chip select lines or address lines to the RAM CPLD.

Try running autoconfig.. if diagrom detects a card rom then the issue is maybe the data path rather than address path.

ok. I ran autoconfig and got this : https://photos.app.goo.gl/akyREk8uXiCKHf3C8

So based on your statement, that means it's the address path? the address path from the cpld to the ram chips?

I checked continuity from the cpld to the ram chips and they all seem to be connected.

oggie wrote: 25 Nov 2019 00:26 ok. I ran autoconfig and got this : https://photos.app.goo.gl/akyREk8uXiCKHf3C8

So based on your statement, that means it's the address path? the address path from the cpld to the ram chips?

I checked continuity from the cpld to the ram chips and they all seem to be connected.

Did you get parts from good sources?