Should try with the 96MB board (or just USE_PSRAM_SLOW in general, though 4bit/slow will make NeoYume unhappy).
I don't think anyone has gotten external RAM to work on an Edge board. (I only have a Rev.A regular Edge and the big JohnnyMac breadboard, which is a nonstarter anyways). Then again, the 32MB Edge exists.
Tried to get this P2 board made with 3 oz copper. But, they wouldn’t do it because pads ( on P2 I presume) are too close together.
Have to settle for 2 oz. May or may not do NeoYume.. will be interesting to see.
Larger diameter vias should help. They'll have more copper per via and the added solder fill will increase heatsinking too. EDIT: And if you are getting them assembled for you then lead-free solder will be better heat conductor as well.
It was a guess but Lead is not great at conducting anything, while Silver is going to be good since it's the best electrical conductor.
Looking them up - https://en.wikipedia.org/wiki/List_of_thermal_conductivities I find lead-free-solder listed as 60. Disappointingly a long way short of its component metals. And with leaded solder at 50 they're not far apart.
EDIT: Personal experience tells me that stated figure might not be correct. My impression of soldering with lead-free is the heat travels much quicker than with leaded solder.
@evanh said:
EDIT: Personal experience tells me that stated figure might not be correct. My impression of soldering with lead-free is the heat travels much quicker than with leaded solder.
Comments
Tried a bit with 24 MB on P8, no luck.
Need a faster way to test...
Should try with the 96MB board (or just USE_PSRAM_SLOW in general, though 4bit/slow will make NeoYume unhappy).
I don't think anyone has gotten external RAM to work on an Edge board. (I only have a Rev.A regular Edge and the big JohnnyMac breadboard, which is a nonstarter anyways). Then again, the 32MB Edge exists.
24 MB works on rev.c edge board. See pics from a few posts ago
I meant "work reliably"
Tried to get this P2 board made with 3 oz copper. But, they wouldn’t do it because pads ( on P2 I presume) are too close together.
Have to settle for 2 oz. May or may not do NeoYume.. will be interesting to see.
They wouldn’t give me 2 oz on top and 3 oz on bottom either. Has to be same on both sides…
Larger diameter vias should help. They'll have more copper per via and the added solder fill will increase heatsinking too. EDIT: And if you are getting them assembled for you then lead-free solder will be better heat conductor as well.
Lead free better heat conductor?
Didn’t know that.
By how much?
It was a guess but Lead is not great at conducting anything, while Silver is going to be good since it's the best electrical conductor.
Looking them up - https://en.wikipedia.org/wiki/List_of_thermal_conductivities I find lead-free-solder listed as 60. Disappointingly a long way short of its component metals. And with leaded solder at 50 they're not far apart.
EDIT: Personal experience tells me that stated figure might not be correct. My impression of soldering with lead-free is the heat travels much quicker than with leaded solder.
>
Maybe related to the hotter iron / air ?
hmm, possibly. I dunno where my roll of lead-free is these days. It might be 20 years since I last used it.