Altair, IMSAI, SWTPC, etc. for sale in Philly

Paul Koning paulkoning at
Fri Nov 4 09:22:57 CDT 2016

> On Nov 4, 2016, at 9:19 AM, Sam O'nella <barythrin at> wrote:
> Out of curiosity and ignorance what's with the solder joints on the cards in the pictures? That orange color seems like it's everywhere around cold looking solder joints.  Is that rust, some sort or protection, or acid corrosion?...
>> The Altair 8800, a very early one, 4-slot motherboard, 1K ram, ceramic CPU,
>> you will see:

I doubt it's any of those.  That's the typical look of a board hand-soldered with conventional rosin core solder.  While it's possible to remove that flux (thought I think the best solvents are non-PC), it is often omitted and generally not needed.


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