Didier,
if you have the old board with DALLAS RAMs:
- make a dump of the CALRAM into a file, as Poul-Henning explained
- buy the 2kB and 2x 32kB DALLAS RAMs, available from several distributors
- DS1220AD-120+ for about 11$/€ and DS1230Y-150+ for about 22$/€ will
do the job
- unsolder the old RAMs, and solder precision DIL sockets instead
- use a programmer like the TL866 to first make an additional download
from the RAM directly
- program the content of the old CAL RAM to the new 2kB one, and insert
all three new RAMs, maybe add these four 32kB RAMs for additional data
buffer
Alternatively, you can replace the nvSRAMs by FRAMs, description
somewhere in eevblog, or at TiN
if you have the new board with the SnapHat batteries, you can't upload
the RAM content again, but:
- buy 2 SnapHat battery replacements
- switch on the instrument
- remove the old batteries
- insert the new batteries, I would support the PCB with something like
isolated plastics, due to heavy bending forces
video and description at M. J. Lorton (not competent at all, but
instructive)
Frank
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