DP Ram Emulator...

[Eric Aos]

> > does anyone have a suggestion for battery backup on this beast??
> > I've got the rest of it breadboarded, and working (Pic, IDT 
> Ram chip,
> > Max 233...) just trying to put the finishing touches on it.
> 
> Check out the Maxim MAX808.  It'll handle the 5V to battery 
> switchover. 
> It also manages a ~CS signal so that the DPRAM doesn't get 
> corrupted if
> a switchover is needed during a memory write.  Finally, there is an
> extra output that can be used to disable the ECM side of the DPRAM.
> 

That sounds a lot simpler than trying to put Humpty Dumpty back together
after the power goes out.

I can't find the Max 808 listed at Digikey, or Jameco. Any other
suppliers? or alterneat Mfg's?

What about the battery? Would 2 3v coin cells be apropriate? (210mAh
each, with a 5mW consumption by the DPRam = quite a bit of backup???).
If so, how do I regulate it to 5v ? 7805? or ???

All I wanted was a Kool Intake... 

Eric <:0 Aos
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