diagrom showing 0 fastmem on new board

TF530 - 63030 + RAM Board

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oggie
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Joined: Fri Oct 11, 2019 12:21 am

diagrom showing 0 fastmem on new board

Post by oggie »

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?
PaulJ_2.0
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Re: diagrom showing 0 fastmem on new board

Post by PaulJ_2.0 »

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
oggie
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Re: diagrom showing 0 fastmem on new board

Post by oggie »

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.
terriblefire
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Re: diagrom showing 0 fastmem on new board

Post by terriblefire »

Did you use DiagROM to try scanning 0x200000 to 0x600000 manually?
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
oggie
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Re: diagrom showing 0 fastmem on new board

Post by oggie »

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

Thanks
terriblefire
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Re: diagrom showing 0 fastmem on new board

Post by terriblefire »

It should probably show you which bank is dead.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
oggie
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Re: diagrom showing 0 fastmem on new board

Post by oggie »

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.
terriblefire
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Re: diagrom showing 0 fastmem on new board

Post by terriblefire »

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.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
oggie
Posts: 46
Joined: Fri Oct 11, 2019 12:21 am

Re: diagrom showing 0 fastmem on new board

Post by oggie »

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.
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arkadiusz.makarenko
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Re: diagrom showing 0 fastmem on new board

Post by arkadiusz.makarenko »

oggie wrote: Mon Nov 25, 2019 12:26 am 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.
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