[rescue] Ultra 2 NVRAM - failed fix

[Peter Stokes]

Hi

Correct, only OBP 4.x cannot be reprogrammed. This is a small number of systems as most have 3.x. 

On the NVRAM, suggest you buy a new M48T58 which should still be available from distis 

Peter

Sent from my iPhone

> On 29 Oct 2024, at 08:50, Ethan Hawke via rescue <rescue at sunhelp.org> wrote:
> 
> 
>> 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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> _______________________________________________
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