Hi World
Thanks to all for your input on a PIC 73 RAM check .... you've proven
so valuable I just gotta dip in this "well of wisdom" one more time.
My application needs to be very reliable so the PIC (on startup) needs to
make
sure ROM has not lost it's mind.  One way is to just add, or OR, or AND
each ROM location to the next location, from the first to the last.
If you ignore overflow,  the result is some number, a checksum of ROM.
If the number is the same as the one you added up when the ROM was virgin
everything is OK.  So here's the problem.   This seems to simple.  There
could be a hidden
problem,  a better WAY.  The most reliable WAY.   Any thoughts on
this.....?