Neil's TF534 buiild

TF534 - 68030 + More RAM Board (More compatible with amiga hardware)

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neilo40
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Neil's TF534 buiild

Post by neilo40 » Wed May 20, 2020 10:51 pm

Hello everyone,

I've been working on a TF534 build to get some practice in before the TF536 boards get here.

Things have gone reasonably well and the board boots diagrom now, but I'm trying to track down some memory problems. If I scan $40000000 to $40400000 then I get this:
diagrom.png
diagrom.png (715.4 KiB) Viewed 3408 times
I think this is telling me that it could read the bottom 16 bits ok, but the top 16 bits are duff. Or have I got that the wrong way round?

I'm thinking it could be:

1) Bad solder job on IC6/7
2) Duff IC6/7 (quite plausible as I've had them on and off a couple of times)
3) Bad solder job on RAMCS2/3 on the RAM CPLD

I've reflowed and inspected a couple of times, so I'm leaning towards 2)...

Neil

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arkadiusz.makarenko
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Re: Neil's TF534 buiild

Post by arkadiusz.makarenko » Wed May 20, 2020 11:11 pm

I had a lot of problems with soldering RAM chips.
I took needle and checked each leg to be 100% sure that they were soldered.
Do not trust people. They are capable of greatness.
~ Stanislaw Lem

Danoo
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Location: Queensland, Australia

Re: Neil's TF534 buiild

Post by Danoo » Thu May 21, 2020 4:04 am

arkadiusz.makarenko wrote:
Wed May 20, 2020 11:11 pm
I took needle and checked each leg to be 100% sure that they were soldered.
Hi Neil,
Built a TF534 a few weeks back, had a few issues with the memory scan on the initial boot.
Found my issues by conducting continuity tests between ram chips on the address lines. If you have Eagle or another software package that will read the board file, you can easily follow the circuit and check your soldering.
As @arkadiusz.makarenko indicated above a couple of fine needles attached to the multi-meter probes, and check each leg is connected will also identify ordinary solder joints.

Hope that helps :)
Life is really simple, but we insist on making it complicated - Confucius

neilo40
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Re: Neil's TF534 buiild

Post by neilo40 » Thu May 21, 2020 8:08 am

Thanks for the tips guys. Will give it another shot this evening

neilo40
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Re: Neil's TF534 buiild

Post by neilo40 » Fri May 22, 2020 9:50 pm

Success!
goodmemory.png
goodmemory.png (718.94 KiB) Viewed 3323 times
And here's the finished article. Things were getting a bit hairy around memory town there, as you can see :mrgreen:
tf534.png
tf534.png (1.48 MiB) Viewed 3323 times
Well, I've learned a huge amount putting this together. I'm sure the 536 build will go a lot more smoothly.

Thanks for your help, and thanks @terriblefire for creating it! Can't wait for my 3.1.4 ROM to get here so I can really try it out...

BTW, I have a few boards left over. If anyone's interested, shoot me a PM

Neil

Danoo
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Re: Neil's TF534 buiild

Post by Danoo » Fri May 22, 2020 10:02 pm

Great work Neil, was it just a few flaky solder joints in the end?
Life is really simple, but we insist on making it complicated - Confucius

neilo40
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Joined: Fri May 08, 2020 10:47 am

Re: Neil's TF534 buiild

Post by neilo40 » Fri May 22, 2020 10:16 pm

Yeah, one on the big CPLD and a few on the RAMs. First time working at this tiny scale, but starting to get a feel for it now.

sP1d3r
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Re: Neil's TF534 buiild

Post by sP1d3r » Thu Mar 25, 2021 10:45 am

neilo40 wrote:
Fri May 22, 2020 10:16 pm
Yeah, one on the big CPLD and a few on the RAMs. First time working at this tiny scale, but starting to get a feel for it now.
Hi neilo040

Since terriblefire deleted the TF534 Github repositories there aren't any Kicad or Gerber files, I wonder if you could point me in the right direction for these, please.
I know you were selling some PCBs on eBay in 2020, I'd like to make a board or two up and a PCB stencil would save a bit of fuss and bother.

Help appreciated!

:slapface:

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