Terrible Fire Accelerators

[plasmab]

Originally Posted by E-Penguin

Surely it was terrible?

Unfortunately no.




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[EzdineG]

Originally Posted by plasmab

Crazy thing. Have you put caps on all the pads on the lower side of the board?


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Aye. Pardon the hideous soldering, the parts are transplanted from another (similar behaving) board.

[plasmab]

Originally Posted by EzdineG

Aye.

Weird


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[EzdineG]

Originally Posted by plasmab

Weird

Something supposed to go next to the cpld? All my DPCBs are missing labels on smaller parts:

[plasmab]

I'll check this board but that resistor was an option for terminating the clock if it was very ringy


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[plasmab]

This is the running board. There is even a butt load of corrosion on one of the ram chips where I spat on it in a previous video.


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[plasmab]

Now passed 100


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[EzdineG]

Originally Posted by plasmab

Now passed 100


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Got these in the mail a bit ago and threw em on here. About to systest:



Hope to put an end to this dilemma soon.

[plasmab]

Have you tried with an FPU installed? I'm just looking at the differences now.

[EzdineG]

Originally Posted by plasmab

Have you tried with an FPU installed? I'm just looking at the differences now.

This is the only card I have without one, and it has been sitting here waiting for that Alliance RAM. It isn't part of any of my previous testing. In hindsight I should have replaced the RAM on an existing board instead to keep the tests sane.

That said, lookie here:

[EzdineG]

This is like "alternate universe" stuff to me:



All this time...

[plasmab]

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[plasmab]

It could be the ram is too fast for the setup times. 10ns vs 12ns


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[EzdineG]

Originally Posted by plasmab

It could be the ram is too fast for the setup times. 10ns vs 12ns

I noticed that when I purchased them, but naively thought that would be a good thing. Out of four boards, this Alliance board is the only one that's stable. Though the Rev 2 behaved a little better, it also ultimately fails.

Either way, problem solved. It's a hell of a good start to a weekend!

And happy birthday, if it's actually your birthday!

[plasmab]

You are welcome and thanks. I have indeed recently age++;


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[plasmab]

I'll get some of that ram to see if I can reproduce. Just for differential analysis. You may have had a bad batch of ram


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[alenppc]

Originally Posted by EzdineG

I noticed that when I purchased them, but naively thought that would be a good thing. Out of four boards, this Alliance board is the only one that's stable. Though the Rev 2 behaved a little better, it also ultimately fails.

Did you try flashing them with a different speed firmware/or use different frequencies? I wonder if that could help the ISSI ram work. It's a shame not being able to use it considering how much cheaper it is.

And Happy Birthday plasmab!

[plasmab]

Originally Posted by alenppc

Did you try flashing them with a different speed firmware/or use different frequencies? I wonder if that could help the ISSI ram work. It's a shame not being able to use it considering how much cheaper it is.

And Happy Birthday plasmab!

The frequency stuff doesn't affect fast ram accesses. Its for crossing into the amiga clock 7mhz clock domain.


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[plasmab]

Got this out of a transcend CF card on the TF530 rev 3


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[plasmab]

Also .. for anyone wanting the CD32 card

PCB Sources are opened up. Jed files to follow.

https://github.com/terriblefire/tf328

and for anyone who wants to get ahead of the game and order some PCBs

http://dirtypcbs.com/store/designer/...tf328-rev1-zip

I havent verified this but i have refactored out all my mistakes from rev 0. Cant be sure they'll work for sure but i've not had a complete failure to date.