[rescue] Sun Ultra 2 series PROMs

Mauricio Tavares raubvogel at gmail.com
Fri Jan 3 01:49:46 CST 2014

On Fri, Jan 3, 2014 at 5:22 AM, Patrick Finnegan
<pat at computer-refuge.org> wrote:
> It may be a little pricy, but you can also buy a new replacement, such as
> the Maxim DS1553.
> Pat
      If it helps, when I still had my SS20 I started removing the the
top coating of the PROM until finding the stupid battery. Then, I
removed it and soldered new wires to the battery socket off a dead PC
motherboard. Some hotglue later and all was well.

> On Thu, Jan 2, 2014 at 9:47 PM, Jonathan Katz <jon at jonworld.com> wrote:
>> Hmmmmm
>> A while back I was whinging that I had an Ultra 2 with a dead PROM battery.
>> And I have the same problem with my E3000.
>> All the old docs for sun4m and sun4c hardware discuss soldering batteries
>> and patching their voltages into the various pins to keep systems alive.
>> I'm working to recreate that so I can get my E3000 going (and maybe the
>> Ultra 2, but I boogered up that chip.)
>> I then took a look. The ICs for the Ultra 2 and for the E3000 IO board are
>> the same. ST M48T59Y-PC1s. Although NOS of these chips exist, I doubt they
>> still have good battery cells on them. Thanks to Google, we can find the
>> pinouts.
>> http://pdf1.alldatasheet.com/datasheet-pdf/view/394698/STMICROELECTRONICS/M48T59Y-70PC1.html
>> It looks like the + of my battery (3x 1.5V AAAs for right now... should
>> give me 4.5vdc) will go to pin # 28, while the - will go to pin 14. This
>> are at the complete opposite ends of the chip, a little different than the
>> various tutorials for the sun4c and sun4m class hardware that are out
>> there.
>> Am I reading the diagram correctly, or after I hook all this stuff up, will
>> I have some pretty blue smoke? We'll see :D
>> --
>> -Jon
>> Jonathan Katz, Indianapolis, IN.
>> _______________________________________________
>> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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