In the current silicon climate fake chips are rife and real DS1210 NV RAM controllers have been really hard to find, with many reports from disappointed buyers. I've found a good reliable UK source of genuine Dallas chips at a reasonable price, please PM or email me & I'll pass on details if interested.
The DS1210 is a DIP8 and sits in series with the Vcc line and /CE on any CMOS static RAM, and with a tiny coin-cell turns it into a non-volatile NVRAM. This typically works out about a third of the cost of a 'commercial' NVRAM such as a 48Z08 etc.
I couldnt wait to confirm these were good, so I did a quick & dirty deadbug kluge of a DS1210 and an AS6C1008 ...sorry if this offends but it works great!
