On Fri, Feb 20, 2004 at 03:37:48PM +0000, Chris Emerson wrote: > On Fri, Feb 20, 2004 at 03:15:32PM -0000, Peter Moreton wrote: > > Yes, I'm thinking of the possibility of the application trashing the > > boot code. > > Doesn't the WRTB bit (boot block write protect), in CONFIG6H on the > 18F452, solve that? It does, but it forces the bootloader to be located in the 1st block of memory, which means that it'll be right smack in the middle of where most applications expect to exist. It seriously violates the transparancy issue that you'd like to see with bootloaders. BAJ -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu