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
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