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Thanks for the information. Will investigate that.

Yes that’s also my thought that the Chinese guy may sent me faulty chips. But with only one chip faulty it should at least recognize the working ones?

@croissantking Yes, the card looks the same on both sides and there were indeed 4 chips populated and 2 unpopulated on each side. But as I said, with all the spaces populated still only the original 16 MB are recognized by the system and not the additional 8 MB. And i get an RAM error whilst...

Thank you both for the information. As suitable chips are very rare and i was only able to find the Samsung ones (1x16), I will scrap the project and stick with 48 MB in the 1400c. I hope i will be at least able to make the 96 MB expansion card of the Kanga to an 128 MB one. I ordered the chips...

Sadly I can’t edit my previous post anymore due to time period expiration. After some search, I found the datasheet for both chips: For LTT version: https://pdf.datasheetcatalog.com/datasheet_pdf/hitachi-semiconductor/HM5164165J-5_to_HM5165165TT-6.pdf For ALTT version...

These are the chips I found https://www.ebay.de/itm/273639328048?mkcid=16&mkevt=1&mkrid=707-127634-2357-0&ssspo=1IHhDRVoR46&sssrc=4429486&ssuid=Ry6avOEiTwK&var=&widget_ver=artemis&media=COP So they are not compatible if i understood you correctly. The chips soldered on the expansion are...

So I assume it’s the same issue for the G3 Kanga? I have a 96 MB expansion card and wanted to bring it to 128 MB by adding the 4 missing chips in order to get the full 160 MB (128 MB expansion + 32MB MoBo). I found 4Mword x 16 bit chips on eBay. Will this at least work or will i have the same...

That makes sense. Thanks for the information.

My RAM setup is 8 MB MoBo 8 MB factory 2x 16 MB user = total 48 MB The expansion cards have 4 unpopulated spaces each, so I wanted to bring them from 16 to 24 MB. So I soldered additional KM48C2100CS-6 (each 2 MB) chips on it. The same as the thread opener intended to do with his expansion...

You are right, i have 8 MB MoBo and 8 MB factory (i forgot about MoBo RAM). So the additional chips are not recognized at all. I desoldered them again and the RAM errors are gone. Maybe the Chinese supplier sent me faulty chips or these are not compatible with the machine.

I removed the small 16 MB stock RAM card with just the expansion card left in and now it recognizes the full 24 MB soldered on the expansion card. But it throws in error that the memory check is failed and i shall contact my dealer. After i skip this message Mac OS boots flawlessly and even with...

I attempted to do the same with my 16 MB RAM extensions and soldered additional chips ordered from China on the empty spaces of the PCB to bring them to 24 MB for a total of 64 MB of RAM (currently i have to extensions á 16 MB and one base module with 16 MB bringing it to 48 MB). But my 1400c...