![]() ![]() ![]() ![]() The latest models use an EEROM so the settings are not held by battery at all now, only the clock used the capacitor to hold its settings when the main battery was removed. Systems which have a removable battery all had a coin battery/super cap, the systems which have a serviceable battery (need to remove the bottom cover, battery screwed down or glued) started with the clock chip and then used a regular capacitor. MacBook's & MacBook Pro's get a bit tricky! Apple started off with a (sometimes hidden) coin battery, they jumped to a clock chip (to hold some info) which had either a small battery or a super capacitor to hold its settings. Over the years this was called PRAM Parameter-RAM, newer models use the term NVRAM NonVolatile-RAM in either the coin battery is used to hold the settings. IMac's have so far used a small coin battery to hold settings as well as keep the clock logic running. Sadly we tend to roll all systems in our minds used the same method, thats far from the truth. ![]()
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