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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 13th Jan 2022, 11:25 pm   #1
Phil__G
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Join Date: Mar 2011
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Default Genuine DS1210 NVRAM controllers

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!
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Old 17th Jan 2022, 4:39 pm   #2
Phil__G
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Default Re: Genuine DS1210 NVRAM controllers

Just a quick update, this same source has genuine NOS Dallas DS1225 8k x 8 NVRAMs
at 12 post free, ideal for the PICLV2. Please PM or email me & I'll pass on details.
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Old Yesterday, 7:22 pm   #3
Mark1960
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Default Re: Genuine DS1210 NVRAM controllers

My own preference is to use the MAX818L, still a current part, the SOP-8 package is the cheapest option and not too difficult to hand solder. This also provides a reset circuit and the watchdog input can be used for a manual reset switch, the watchdog input has to be held low for 1.6 seconds, but this helps to avoid accidental resets.
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