Regarding that DS1230 nvram, once you back the data up into a file, you can carefully remove the top portion of that part. You will find two CR2532¡¯s (think that is the number) encapsulated within. Some place a double button cell holder with contacts with hotmelt glue. Go check out www.eevblog.com, there is a thread about this that goes into great detail.
Take care!
Jon
Sent from my 20" Texas sized
iPhone....
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On Mar 21, 2019, at 3:47 PM, Reginald Beardsley via Groups.Io <pulaskite@...> wrote:
Battery life on the early Dallas parts was 5-7 years. I had to replace one in a 5-6 year old Sun workstation. Dallas stopped making them and for a while Maxim made them. At present the only NVRAM source appears to be ST Microelectronics.
I am waiting for a pair of chips to arrive from the UK as there is no stock in NA. They are backordered until June. I was able to get a pair for my Tek 11801 courtesy of a member of the TekScopes list. RS sold out 34 chips in 8-10 days while I was waiting for my 11801 to arrive. I got the last two.
The only demand for these is repairing old instruments, so ST appears to make a small run once a year. The current ST chips use a lithium cell, so shelf life should be reasonably good. But the cells are very low capacity (40-120 mAh) and can easily be drained if inserted into conductive foam. They are widely available on eBay, but the freshest I could find were US NOS parts of 2002 manufacture.
Reg
