68HC11 Learning tools

[FJB203 at aol.com]

In a message dated 97-01-20 00:43:08 EST, you write:

> Another great product is Dallas's Smart Socket.  It provides battery backup
>  for any low power CMOS RAM just by plugging it into the socket.  Also

YOu can also do that yourself by putting a litium 4.5v battery in series with
a diode to the memory chip, thus preventing the battery from being charged,
and most ram chips can't be accessed when the voltage is about 4v or less
(not all, but most), which the diode also does (most small signal diodes have
a voltage drop of about .6 volts.

Fred