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   LaF0rge (laf0rge@chaos.social)'s status on Monday, 20-Jan-2025 02:32:23 JST 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. #retronetworking #telephony #gdr #ddr 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 (laf0rge@chaos.social)'s status on Monday, 20-Jan-2025 02:33:49 JST LaF0rge

     in reply to

     More pics from the NZ96

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     F4GRX Sébastien (f4grx@chaos.social)'s status on Monday, 20-Jan-2025 04:06:17 JST F4GRX Sébastien

     in reply to

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

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     LaF0rge (laf0rge@chaos.social)'s status on Monday, 20-Jan-2025 17:26:05 JST LaF0rge

     in reply to

     • F4GRX Sébastien

     @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 Sébastien (f4grx@chaos.social)'s status on Monday, 20-Jan-2025 17:32:07 JST F4GRX Sébastien

     in reply to

     • rawe

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

     Very interesting.