(revised): clock battery on a SS1?

2007-12-25 9:12:00

I ended my original summary by saying:

> > Thanks also to John Valdes for mailing me a copy of the NVRAM FAQ, which

> > I will follow in trying to piggyback a new 3v battery onto the existing

> > NVRAM. (Much cheaper).

Mark C. Henderson (mch@squirrel.com) informs me that the NVRAM FAQ is a

bit out of date; the NVRAM chips only cost about US$20.00. His mail to

me:

> Mauser Electronics

> 800-346-6873

> order one of the following part numbers (take whatever they have in stock)

> 511-M48T02-20PC1

> 511-M48T02-15PC1

> 511-M48T02-12PC1

> There are complete instructions for installing a new NVRAM in the file

> nvram.info in

> The instructions for reprogramming the NVRAM are also much simpler

> because I've discovered a one line command to program the IDPROM info

> (no calculations of xors etc.) by decompiling the OpenPROM monitor.

> Over time, I've restored the NVRAM on about twenty machines (IPX,

> SS1, SS1+, IPC, SS2, 3/80).

> I eventually plan to turn nvram.info into a new improved NVRAM FAQ

> (I'm either not going to include the stuff about splicing the battery

> in, it isn't worth the effort for a $20 part, or just include it as

> an appendix), so I'd appreciate any feedback.

> --

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| cbarnard@cs.uchicago.edu / \ anybody could become president. |

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