[time-nuts] pm - re: Dallas NV-SRAM replacement? (in 3458A)
phk at phk.freebsd.dk
Tue Jun 8 14:58:11 EDT 2010
In message <FBCMCL01B01FRaqbC8w0009c8bf at FBCMCL01B01.fbc.local>, Marco IK1ODO wr
>>I replaced all the NVRAM's in mine last month, no issues.
>>There are plenty of NVRAMs to be had as new.
>that's good news. What have you used?
TI's BQ4011YMA-70N and STM's M48Z12-70PC1
I soldered low profile sockets in to make it easier in 2020 or
>>You can read out the memory with the undocumented "MREAD" command,
>>but the CALRAM is protected by various tricks, so you cannot just
>>use the MWRITE command to restore it.
>So, have you read the RAM with an eprom-programmer, and then rewrote
>them, or simply replaced?
I read and wrote them with a eprom-programmer, that was the easiest...
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.
More information about the time-nuts