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Is this the one? The heatsink threw me off, agree it's not great design and the CoolerMaster fan isn't stock. Replace the fan if going back into your QS as its pretty crappy...

... yes (doesn't it already have 16MB but gone bad?)? It would be the sweet spot as 4 x 16MB (64MB) might not be fully cacheable on this 386/early 486 design. 30pin 4 x 4MB kits would be readily available in your region, maybe even new

I reckon the ImageWriter is worth keeping if you have a matching computer, as you can still get the ribbons and they're as rugged as a cockroach. StyleWriter II will be all gummed up and probably not work. Apple Scanner is cool too if working well.

No onboard RAM if the error keeps coming 4 x 4MB would be nice. Love how yours has an ISA slot! Thanks for video. Yep mine same low-res DOS full screen is terrible but Windows better than you'd think. Still planning on trying the card in various Macs, video subsystems to see if can improve...

I've got a slimline fan on mine too (Sonnet L2 G3 400Mhz @ 500Mhz), not like it's roasting hot but temps do jump up fairly quickly under load.

... it's probably a $50 Mac here and $100 on eBay

It'd be 32 - 64MB depending on onboard cache size of your card - does it have 8 slots or 4?

I wouldn't trust Norton to fix ProDOS partitions, and note it came up "catastrophic" errors pretty much every time you run it! :) The multiple partitions would be < 32MB each which was the max partition size the Apple II/IIGS would work with. The documents you have recovered look mostly like...

Sadly the errors point to a memory issue, the onboard RAM test at POST is usually pretty rudimentary. A 486 I had built up recently would do same - good on POST but HIMEM.SYS would fail. A utility such as MEMtest86 would allow you to stress the memory subsystem further...

Google the model number of the HD and you should quickly find instructions on how to manually set SCSI IDs on the drive shifting a jumper

Yes, that one

There are Apple branded GIMO adapters that let you mirror the internal CRT to external too; pretty cheap at times

The Powerbook 550C motherboard is silkscreened as such, but I don't think it has any difference maybe apart from a slightly different RAMDAC or video chipset for the different LCD?

I really admire the OPs passion and ingenuity, however maybe maybe start smaller and go from there? You will have trouble finding others to collaborate on what is a particularly niche project with very broad outcomes.

If it's not crashing under load it's adequate and max 40 degrees is well under this. If you can on any vintage Mac a modern fan here and there can help things along markedly.

You've had quite a busy weekend - nice work on this too. Like you I'd only ever trust the water immersion + H2O2 + lots of beating Aussie summer sun for lightening ABS plastics. Never understood why people did the film/wrap method as it will be patchy.

… by adding a secondary PSU or dialling components down (low power SSD, no PCI cards). Hit same issue with my Takky G3, CF SSD solved it. Also check all wiring again

Cool little dude, sorry he has gone from your life.

Really nice restoration and good it didn't need too much overhaul to get up and running.

Sounds like a good project. What I'd really like to see is some sort of internal CRT mod for the 5500 so can use a PCI video card as primary