We always clear all data registers in a part to 0 as a part of the normal
power-on start up. Routines vary by processor type, but generally are quite
small. Have never felt the need to do a read / write nor pattern check on
the RAM in a PIC.

Tom

-----Original Message-----
From:   Charles Hoss [SMTP:timothy@BEKES.HUNGARY.NET]
Sent:   Wednesday, January 07, 1998 5:18 AM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: 73 RAM Test

The Jacky's wrote:
>
> Hi All...Happy New Year!
>
> Just after power up my PIC 73 needs to run a quick RAM check then
> initialize all RAM and special function registers to a known state.  Any
> nifty ideas?...Thanks in advance...gj

how about a Decrement Jump Not Zero for
all of them
if one of them is faulty it will freeze
:)

unless the faulty ram is stable at 1

you should come up with something
against stuck ones , maybe an ijnz
loop too ...

bye
charley