68kMLA Classic Interface

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Soldering more Memory on Powerbook 520 Memorycard

Posted by: chiaki on 2011-04-30 05:45:21 I got a Powerbook 520 with 4MB Memorycard, but 8MB Memory is not enough for me 😛 I attached pictures from the card, has anybody a clue what memory and what resistor i must solder?

Posted by: Byrd on 2011-04-30 16:05:27 When you can pick up larger size RAM modules on eBay for cheap, the time/life spent soldering on 4MB isn't worth it 🙂

Posted by: Bunsen on 2011-05-01 16:17:47 68k Powerbook RAM in large sizes is not exactly on eBay every day, and a 4MB stick is small enough to risk destroying. I say go for it! I would guess that you need to find RAM ICs that exactly match those on the other side. As for the other components, I have no idea. Alas, probably the safest route is to find a larger capacity RAM module and copy it.

Posted by: BTeam on 2011-09-18 14:04:37 It has been a lot of years, but as I recall you must use the same brand pseudo-static memory chip. Or use the more expensive full static memory chip. I don't think it needs any resisters. I think all of that is taken care of in the memory control IC. It would be good to add ceramic capacitors. Either .1 or .01

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