[rescue] Sun Ultra 2 series PROMs

[Patrick Finnegan]

It may be a little pricy, but you can also buy a new replacement, such as
the Maxim DS1553.

Pat


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.
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