"Vintage Macs" <[email protected]> writes: >I suspect this topic more properly belongs in 1st PowerMacs rather >than Vintage Macs.
Whoops been on eBay too much every oldish mac is 'vintage' on there! ;^) > > >Thank you for this information. I bought four of these SIMMs on Ebay >a while back but hadn't tested them yet and wasn't certain in which >machines they might work. Apparently the Samsung SIMMs turn up on >Ebay from time to time. eBay seems to be a good source I've picked up the 128 mb chips in pairs for $40 usd and just picked up 8 of the 64 mb chips for $40 cdn yesterday. I've only tested the following from my collection, not sure what has possessed me to do this but I've decided to max out all the machines I have because ram is cheap right now and still available. The 6100/66, LC 475/Quadra 605, LC 575 and LC/Quadra 630 all work with the 128 and 64 mb chips. Now the 128 mb chips I used are single sided ie only populated with chips on the front however they have traces on the back so I would suspect there might have been some 256 mb chips made by this company out there and those I'd be interested in trying since the double sided and single sided 64 mb chips I have both worked. The 7100/66, Quadra 660av, 840av and for that matter all the 040 based machines that take 72 pin simms do not work with either of the chips above. Er well actually they will work but only see 16 mb of 64 mb or 32 mb of 128 on these chips. >If you mean that you want to test a pair of 256 MB SIMMs in the 6100 >to see if you can get 520 MB of RAM, then I can almost guarantee that >this will not work. A careful reading of Apple's Hardware Developer >Notes for the 6100/7100 and 8100 seems to say that 264 MB is the >maximum memory space allocated for RAM. There were some complex >details, so I could have that wrong, but I'm pretty sure that the >internal memory map of those machines (set by hardware and the ROM) >just doesn't support more than 264 MB of RAM. I would have thought so too and being skeptical as I am I'm not going to commit 100% until I track some down and try them these are the sites I found with mention of 256 mb chips being used in the 6100. But..... http://www.lysator.liu.se/~matca/mac/up6100.html http://www.kan.org/6100/RAM.html > >The x100 family all use the same chip set and virtually the same ROM >(the 6100 and 7100 do use the same ROM, the 8100 ROM is slightly >different), so the underlying capabilities of the machines should be >identical. Most likely, the SIMM sockets in the 6100 are wired just >a bit differently than in the 7100. > >It shouldn't be that tough to trace out the connections to the SIMM >sockets in the various machines--just tedious. Hmm will have to try that on my 7100 after my skinned knuckles heal! Not as bad as swapping a hard drive in a CC but not one of my favourites. >Ouch. $199 and $449 for 64 MB and 128 MB SIMMs. Ha, ha, ha, >ha.... These folks have 64 MB SIMMs for $14 ><http://store.yahoo.com/memorysuppliers/72pinsimms.html>, though I'm >not certain that they are the correct single bank type. I bought a >couple from them about three years ago, but have yet to test then. >One interesting thing about the boards that they sent me is that they >have blank positions on the back for another set of chips. This >implies (assumign they're still using the same boards) that a person >handy at soldering could buy two 64 MB SIMMs, move the chips from one >SIMM to the other and end up with a 128 MB SIMM for $28. Hmm thanks for the info, must force myself to not feed my ram addiction any further.....I've soldiered chips before and besides being a pita me thinks you'd probably wreck them from too high a temp on my gun to just plain wrecking the traces (he says eyeing his single sided 128 mb chips....) > > >A few years ago I tested memory in the Q605 which is the same as the >LC and Performa 475/476. What I found is that 64 MB SIMMs need to be >"Single Bank" in order to be properly recognized in the Q605. Double >Bank is not recognized properly. I'm not sure exactly what Single >Bank means, though I suspect that it has to do with using addressing >to distinguish between address regions of the SIMM as opposed to >using different Chip Enable lines to make the distinction. > >I also tested the same SIMMs in the Power 120 which is basically a >PM8100. In the Power 120, the SIMMs' recognized capacities were >either halved or quartered, depending on whether it was a SIMM that >was fully recognized in the Q605 or not. Interesting info, not sure what single banked vs double banked means either guess Mr Google can help though. So far I guess I've been lucky in that all the chips I've bought work. Probably time to stop though before my luck runs out. I think the only thing I would really like to track down is a Daystar Turbo 040 adaptor card for an SE/30 as I already have the accelerator. Not sure why but would like to see what an 040 powered SE/30 with 128 mb of ram is like. Er well ok, maybe 256 mb of ram in my LC 575 powered CC too. Ok I'll stop now. Thanks for the reply Kevin -- Vintage Macs is sponsored by <http://lowendmac.com/> and... 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