On 6/5/09 9:55 PM, PeterH of [email protected] sent > On Jun 5, 2009, at 4:01 PM, Dana Collins wrote: > >> Thanks for the chime-in and the information. SO, possibly, the 256Mb >> stick that I have (which is installed in slot 2, the more accessible >> slot) is a high density stick, forcing the unit to read only 1/2 of >> the actual RAM? > > Yes, "high density" RAM will be seen as one-half of its rated capacity. > > It uses more address lines than the PB supplies, or it uses them in a > different way than the PB intended (this was seen on the much earlier > "First G3 PB", the 3500/Kanga). > > There is no workaround, and Apple didn't get around to fixing the > "high capacity" problem until the Pismo. > > The "high capacity" problem is different than the "high density" > problem, and that, in turn, is different than the "high profile" > problem. > > Essentially, in the Pismo, all these problems except the "high > density" problem were fixed by a new LSI chip, and a new processor > card design. > > The "high density" problem wasn't fixed until later Macs, which is > why one must apply the general rule, "for all first and second > generation 'New World' Macs, including PBs, buy only 'low density' RAM". > Well there you go - that makes perfect sense. I was aware of such issues with comparably aged desktops. The missing piece to the puzzle was if such a condition applied to the Lombard, and since I never owned one before, I did not know. Thank you for the good explanation, Peter. Best regards, Dana
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