Speaking of the 3458A, it has three DS1235Y-150 non volatile SRAM on
the CPU board. Each is a 32K x 8 bit, so there is a lot of info inside.
As the useful life of those is in the order of 10 years and most
3458A a re now 10 to 20 year old, is there a possible replacement?
Possibly with a more modern component?
Also, of course it would be a good idea to read and save the contents
of the SRAMs before replacing, but... is any custom data in them that
cannot be rewritten with a complete recalibration?
Possibly this argument has been discussed before, but I don't remember.
Marco IK1ODO
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