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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
@LaF0rge this frosting effect on old soldermask covered traces has always been a mystery to me.
@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.
@stereo4x4 ah, thanks, nice! The zx spectrum image is pretty dramatic!