[rescue] Ultra 2 NVRAM - failed fix

[Ethan Hawke]

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

Some Ultra-based NVRAMs can be reprogrammed, including the Ultra 2 
(Ultra's running OBP 3 will work).

> 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.
Does the chip not work at all or just not remember it's settings? You 
can use 'watch-clock' at the OBP ok prompt to see if the chip is working.

Ethan

On 29/10/2024 7:08 pm, Jonathan Katz via rescue wrote:
> 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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