mods

I opened up this Macintosh Plus today and came across this mod - never seen it before! Anyone know what it does?

Hey all! Inspired by @Branchus 's latest video demoing Kero's new RAM boards, I wanted to return to and try to upgrade my PowerBook 540c's own RAM module. RAM modules for the PowerBook 500 series are notoriously expensive now, and because the connector no longer exists, new boards cannot be...