Conversation
LaF0rge@chaos.social

LaF0rge

IGHfT (communications museum dresden) has just acquired a NZ96D (digital PBX built in 1988 in thr GDR) in ots original wooden crates, brand new. https://www.tag24.de/dresden/kultur-leute/museum-in-dresden-erinnert-an-meilensteine-der-telefonie-und-wird-jetzt-groesser-3347937

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LaF0rge@chaos.social

LaF0rge

Reply to @LaF0rge@chaos.social

More pics from the NZ96

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f4grx@chaos.social

F4GRX Sébastien

Reply to @LaF0rge@chaos.social

@LaF0rge this frosting effect on old soldermask covered traces has always been a mystery to me.

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stereo4x4@techhub.social

rawe

Reply to @f4grx@chaos.social

@f4grx https://retrocomputing.stackexchange.com/questions/12356/what-causes-the-traces-to-wrinkle-like-this-and-should-i-be-worried

I never intentionally scratched off solder mask on those old boards, but solder below the solder mask sounds reasonable. I am sure that on modern standard process boards there is no solder layer below the solder mask.

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f4grx@chaos.social

F4GRX Sébastien

Reply to @stereo4x4@techhub.social

@stereo4x4 ah, thanks, nice! The zx spectrum image is pretty dramatic!

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LaF0rge@chaos.social

LaF0rge

Reply to @f4grx@chaos.social

@f4grx it's just solder/tin on the copper traces before applying solder mask. I rarely saw old PCB that don't have this. Not sure exactly why, maybe to prevent oxidization of the copper? I've seen some rumors that occasionally it was also used to increase current carrying capacity of some power electronics traces, but I'm not sure I'm buying that.

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f4grx@chaos.social

F4GRX Sébastien

Reply to @LaF0rge@chaos.social

@LaF0rge Yes, @stereo4x4 gave an interesting link here: https://techhub.social/@stereo4x4/113856832008551580

Very interesting.

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jmorris

James Morris

@LaF0rge all this will be important for rebuilding society after the next war

RE: https://chaos.social/@LaF0rge/113856213231658972
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