[Coco] MM/1 RTC RIP

[jdaggett at gate.net]

On 25 Jan 2008 at 11:30, Kevin Diggs wrote:


> Bruce W. Calkins wrote:

> > I fixed one on a PC where I broke open the clock "chip" and broke

> > the battery lead and added a external battery holder and battery. 

> > And before I got a Dremel I used Dremel bits in a 1/4" drill.  It

> > sounds like this guy did much the same as I did.

> > 

> Has anyone tried to figure out how to use one of those battery backup

> 0.5 F capacitor thingies?

> 

> kevin


They work well for very low current demand. In backup situations for a real 
time clock they may allow enough time to switch a primary battery. I used 
.33F caps in pager design and kept memory alive for about 3 to 6 minutes. 

Aloso caps loose capacity with age. 

james