There is an RF shield-type metal cover that screws onto the enclosure for the ram and daughter boards, but I suppose that it's not strictly necessary. Otherwise it's quite snug in there.
There also may be a plastic arm that serves as a mounting bracket for said cover, but that can also be removed.
Oh my god, thank you for this comment! My 540c display would occasionally get distorted or show jitter, and it would come and go with no real pattern (heat, etc). I tried squeezing on all the ribbon cables in the hinge assembly but never thought to squeeze the monitor itself, that cleared it right up! I'll have to disassemble the monitor itself to reseat the connector for a more permanent fix then...I was also able to deal with an issue with the monitor where it would occasionally flicker and/or the colors would be out of whack. I had discovered previously that squeezing the lower left side of the monitor frame would resolve this, but I was worried it was loose solder. Fortunately, as I discovered on disassembly, it was just a loose connector. And it seems to be a bit brighter, too! That may just be my imagination though.
See the post by @Paralel above - it’s been determined that 32mb is the max for the RAM card.Just wanted to follow up on this, did someone verify that you could convert a 32Mb module to 64Mb? And would the 500 series recognize it, or would you need to do a few extra modifications? I have a 32Mb module with the 183Mhz 603 and it's running OS9 believe it or not!!
To answer my own question, having looked at various SIMMs on ebay, this isn't possible.
Indeed, could the same be done to the chips on the processor card to bump it up to 8 or 16MB, for a total of 40/48mb?
I bet the same could be done to the chips on the processor card to bump it up to 8MB, for a total of 40MB.
Congratulations on this great feat! Great to know that it's feasible and working.OK, I've successfully converted my 4MB RAM card into a 32MB card, using a donor DIMM with compatible chips. So far, it seems stable and has passed a couple of RAM tests.
I'm actually fairly impressed that I've managed to pull this off.
Thank you, Iesca!Congratulations on this great feat! Great to know that it's feasible and working.