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Macintosh II Battery Holder Board


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  • 3 months later...
4 hours ago, ymk said:

Guessing here... to retain the memory through a battery swap.

 

That would make sense, thanks. I've been having trouble with a Mac II that often refuses to boot until I've removed both CR2032s and the power cable, left it for 60secs, then put everything back in again. Right now it's not even booting after doing that...

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On 2/9/2021 at 7:07 PM, DeChief said:

Does anyone know what the capacitor is for?

On 2/9/2021 at 7:09 PM, ymk said:

Guessing here... to retain the memory through a battery swap.

It might make sense to add a small modification, wherein the capacitor can be discharged via a jumper and a resistor (to prevent it from discharging too quickly and causing damage to something), thus wiping the memory and allowing for a true reset.  It would then be somewhat akin to the CMOS/BIOS reset jumper that many PC motherboards have.

 

c

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