Pics have pretty good copy protection. I'd be surprised if Agilent haven't protected the pic in the E1938. Many pics (AFIK thisincludes the 'C74) scramble the data on reading a copy protected chip. This allows the verification of a chip without revealing the code. A known good chip is a starting point. fortuntly HP socketed the PLCC pic. Know you need a time nut with a good E1938, a PicStart Plus ( or similar programmer) and a PLCC adaptor. I have the latter two but no E1938.
Robert G8RPI. --- On Sat, 13/6/09, Richard H McCorkle <mccor...@ptialaska.net> wrote: > From: Richard H McCorkle <mccor...@ptialaska.net> > Subject: Re: [time-nuts] E1938 PIC hex files? > To: dan...@verizon.net, "Discussion of precise time and frequency > measurement" <time-nuts@febo.com> > Date: Saturday, 13 June, 2009, 7:16 AM > Hi Dan, > > If the 1938 was purchased through Fluke1 he is usually very > good > about replacing bad items he sells to Time-Nuts. You might > want > to contact him about a replacement unit or perhaps getting > a > pre-programmed PIC from a different unit to try. > > Richard > > > > I am beginning to think that the PIC in my Chinese > Ebay 1938 is dead or > > at least injured. Does anyone have the hex files > for this one? Blank > > PIC16C74As can be had and it may be worth my trying to > program a new > > one. Nothing else seems to make it work and as > the PIC seems to be > > asleep, I'm not sure that attempting to talk to it > with the serial > > program is going to help me much, but I will try. > > > > The part number is: E1938-80002 > > > > > > Dan > > > > ac6ao > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
