[volt-nuts] 3458A NVRAM

Poul-Henning Kamp phk at phk.freebsd.dk
Tue Dec 19 08:32:44 EST 2017

In message <000401d378cd$31568960$94039c20$@perdrix.co.uk>, "David C. Partridge" writes:
>I'm looking at the A5 board in my 3458A.
>The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should likely be
>replaced.  I *think* the Ramtron FM1608-120-P is a direct "drop-in"
>replacement in this application for the DS1230Y.  Is that right?  If so I'll
>get some in from eBay.

Make sure to read out a backup copy of the NVRAM via GPIP before you start
desoldering the CALRAM, there seems to be about 25% chance that it looses
contents during desoldering.

See the function "nvram" here for details:


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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