Date   : Sat, 28 May 2011 09:35:47 +1000
From   : awilliams@... (Alan Williams)
Subject: SW-RAM Questions

> Also, is a battery backup for the SW-RAM as simple as 3 AAs and a
diode connected to the GND and Vcc pins of the chip?
 
You really should make sure that CE, OE, and WR are all held high if
there is no 5v from the computer.  If you don't do this you run the risk
of random writes to your ram on power up or down.  This really means
another logic chip powered off the battery and thus some complications
which may or may not be worth it.

Alan