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CPS3 - How to convert 32Mb SIMMs into a 128Mb SIMM

hello
finally, on of my upgraded SIMM is working, but not the other.
my setup is :
  • slot 1 - 64MB
  • slot 2 - 64MB (not required)
  • slot 3 - 128MB working
  • slot 4 - 128MB (32MB upgraded to be tested)
  • slot 5 - 128MB working (only 32MB required)
When installing SFIII NG, it stops at 54%. I have an error in japanese telling "Can't write". Is there a way to identity which SIMM and chip on SIMM in slot 4 is not working ?
thanks
 
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yavuzg said:
Now we are finished with the reverse pinout ICs. Next, we'll start soldering the normal pinout ones. One thing is important placing the flash ICs correctly. You'll notice that there are triangle marks on the PCB. These triangle marks indicate the #1 leg of the IC should be located there. The flash ICs have a tiny circle on them (they also do have a larger circle but that is something else) indicating the #1 pin.

I put circle on the photo to help explain what I mean...

IMG_8882_zpsdpuvltne.jpg


With the same soldering technique I solder the normal pinout flash ICs one by one...

IMG_8883_zpsrsllnchp.jpg


And the other side...

IMG_8884_zpsh8azrqda.jpg


Top view... All in place, we are finished ;)

IMG_8885_zpsdedxxqx4.jpg

Don't forget to clean the flux with IPA and/or Acetone and double and triple check the legs with magnifying glass one more time. Sometimes your iron tip may accidentally touch the neighbor IC leaving a solder bridge that you may have not noticed...

Anyway, after cleaning and examining twice, this is what we end up; One empty PCB one 128Mbit SIMM :D

IMG_8886_zpsnglptiwd.jpg


And the ultimate question! Will it work?
Click to expand...
Anyone knows the vaule of the small bypass caps?
 
Thanks for this thread @yavuzg .
 

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cruzlink2 said:
Thanks for this thread @yavuzg .
Click to expand...
Are those Fujitsu 90PTFR and 90PTFN chips? where did you source them? I've tried several suppliers and either get PTFN when it should be PTFR or I get slower speed (120) chips.

Edit: To clarify I can see the fujisu logo and looks like PFTR chips (pic is little blurry on the markings) Just be good to know of a reliable source that is actually sending the product they're selling.
 
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Can someone tell me the value of the capacitors at the top of the simm? Are they 0805?
I am lacking 4. I had two 32 MB simms as donors for the ptfr.
I took this on, and I might add, unless you are a pro at microsoldering, which I am, I would just buy a spare simm.
It IS doable though.
 
ForestOfDreams said:
Can someone tell me the value of the capacitors at the top of the simm? Are they 0805?
I am lacking 4. I had two 32 MB simms as donors for the ptfr.
I took this on, and I might add, unless you are a pro at microsoldering, which I am, I would just buy a spare simm.
It IS doable though.
Click to expand...
should be .1uf 0805 I just measure one.
 
tiff_lee said:
Are those Fujitsu 90PTFR and 90PTFN chips? where did you source them? I've tried several suppliers and either get PTFN when it should be PTFR or I get slower speed (120) chips.

Edit: To clarify I can see the fujisu logo and looks like PFTR chips (pic is little blurry on the markings) Just be good to know of a reliable source that is actually sending the product they're selling.
Click to expand...
sorry I never replied to this must have missed it, the person told me they got the chips off aliexpress, but we all know it's a gamble getting stuff from there.
 
Thanks! Fingers crossed this thing works after I put those on. Right now I am cleaning the caked on flux off with ipa.
 
I don't think those caps are strictly necessary, honestly. I've made a couple 32MB SIMM conversions myself and didn't use the caps and they work perfectly fine. I've also seen others doing the same and it doesn't seem to cause any problems.

But for the sake of completeness, good to know the value!
 
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