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Decstation 5000/25 maxine, new RTC startup
This machine has worked fine for years with NetBSD 3.1 and has firmware KNO2-
Since the RTC cell in the Dallas DS1287 was getting low I re-powered it with
in-situ surgery and a remote 3V cell as many others have done.
It now does not boot firmware to the point where the local console has scan;
only the initial two flashes appear from the LED and there is no subsequent
If I remove the cell it will eventually boot to a prompt after about 20
minutes but gives RTC errors as expected and will not boot the OS.
If I remove the entire RTC it does not boot.
I replaced the DS1287 with a new DS12887, still no boot.
The question I have is this: the data sheet for the DS12887 says that the
clock in a new chip must be started by writing "a pattern of 010 in bits 4 to
6 of Register A." Does this need to be done manually or does the firmware
automatically do this on boot?
Thanks for reading...
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