Shreve Systems did a ton of these modifications back in the day. It was fairly popular as the Q650 logic board is a very nice step up from a IIci.
Anything up to 32MB SIMMs should work in the Q650. I've tried 64MB and 128MB SIMMs in them, and IIRC, they were detected as 1/2 their capacity. It might be interesting to install four 128MB SIMMs and see if you get 256MB of RAM. I'm not sure how reliable it would be.
Ah, checked my notebook, and I remembered correctly, above. 128MB SIMMs were detected as 64 MB. However, I did not test four of them simultaneously, I think.
I think that the SIMM socket wiring in the Q650 bears more investigation. Its less capable cousin, the Q605 will go to 260MB of RAM with a pair of 128MB SIMMs and a SIMMverter installed. There must be some way of getting 256MB of RAM into the Q650, at least.
Anything up to 32MB SIMMs should work in the Q650. I've tried 64MB and 128MB SIMMs in them, and IIRC, they were detected as 1/2 their capacity. It might be interesting to install four 128MB SIMMs and see if you get 256MB of RAM. I'm not sure how reliable it would be.
Ah, checked my notebook, and I remembered correctly, above. 128MB SIMMs were detected as 64 MB. However, I did not test four of them simultaneously, I think.
I think that the SIMM socket wiring in the Q650 bears more investigation. Its less capable cousin, the Q605 will go to 260MB of RAM with a pair of 128MB SIMMs and a SIMMverter installed. There must be some way of getting 256MB of RAM into the Q650, at least.