[rescue] Ultra 2 NVRAM - failed fix

[Jonathan Katz]

Ultra-based NVRAM cannot be recoded from the ok prompt.

-Jon
+44 7792 149029


On Tue, 29 Oct 2024 at 07:56, silcreval via rescue <rescue at sunhelp.org>
wrote:

> I've started restoring an Ultra 2 which I've had on the shelf for a long
> time.
>
> These are nice machines, and sort of a bridge between the older pizza box
> Sun's and the later Ultra 10/30/60/80. They still come with SBUS slots, but
> have a UPA slot for a graphics card, usually a Creator3D.
>
> They seem to take up to 2G of RAM. Mine has a single CPU and 256M of RAM
> by the looks of things (4 x 64). There are dual HD which are 4G each.
>
> Mine seems to work fine and even boots to my surprise. However the NVRAM
> is of course dead as a dodo.
>
> Now I've done the usual dremel job on the NVRAM, fitted a battery and then
> reset and re-entered the NVRAM values using MKP on the boot prompt.
>
> But unusually this failed to work. I'm pretty sure the soldering etc is
> OK, and I actually removed the old battery from the chip so there is no
> short from that.
>
> As this is not the usual M48T02 chip, it is instead a M48T59Y, I'm
> wondering if I'm missing something with the reset, or if the chip is just
> literally dead at this point?
>
> Thanks as ever for the help
>
> - Ian
> _______________________________________________
> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
>
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