Re: Apple II Memory Expansion Card

["Henry" <apl2research(.a.t.)comcast.net>]

Hey guys.


> Michael J. Mahon
> These aren't static RAMs--they burn power all the time.
> Remember how warm these RAM cards get?
>
> It will take a sizeable battery (like the original Disk ][-sized one)
> to provide moderate battery life.
>
> Put another way, what was the current capacity of the RAMCharger wall
> wart?

Very true.  I think it was you who pointed out there's no such thing as an 
'idle' DRAM.  I'll not quote sure how much power it will take to hold the 
card when the computers off but I'll get a rough idea once I start to 
understand the layout of the card a little better and start to calculate the 
requirements of all the components.

I know with our 200 Power Supply it's technically 'on' all the time and it 
could be made to provide power to the board even when the computer is off as 
long as it's still plugged in.  The issue with that however is you would 
need to tap in to the 5v circuit and then my question would be if it has 
enough power to do what we want.  I don't think it would really.  As Scott 
mentioned it called the '5v Stand By' supply.  On PC's it's just meant to 
provide enough power for a few LED's and some low power circuits to turn the 
computer fully on.  I can't see it being more then one or two hundred 
milliamps at most.  I'll look in to it though.  Good idea guys!


-- 
Henry S. Courbis
www.GSE-Reactive.com
Apple II Series Legacy Hardware - Come take a look at what we have to offer!