Obsolete NVRAM chip for sun4u

Does anyone know the correct replacement for the NVRAM chip 48T59 used in Ultra 5, 10, 60 (to name a few)?
This has already been obsoleted by the manufacturer and they suggest using 48T58 instead. Has anyone tried to use this?

supremedalek wrote:This may not be the answer you want, but you could put a new battery in it. I mean, when they go bad it is usually just a dead battery. If you are handy with the soldering iron, you could put a normal PC motherboard CMOS battery + socket on the top and wire it to the NVRAM chip.
Just a thought...... except there are no contact points anywhere on those systemboards to give you access to the electrical tracings used by such batteries. The owner of such a system would need skilled inventiveness to get solder points INSIDE the prom socket and not damage that socket by their efforts.
Your response was at least some sort of effort to jog someone's thought processes.
However you might consider giving advice only when there is some validity to it.
I'm familiar with that hardware and would never attempt such a modification to what is now an 11-year-old lump of hardware.

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