I just acquired 2 ea.3534-00 Vodavi Flash Voice Mail Boards. One was new in the box and the other was not.
What I noticed was that even though the boards are pretty much identical one has a Dallas DS1687-3 Real-Time Clock chip that is mounted on the board. It is a 24 pin device that is soldered into the UI4 position on the board.https://datasheets.maximintegrated.com/en/ds/DS1685-DS1687.pdf
The other board is empty in this position. I have looked at others on eBay that have pictures of the board and 90% are without this
Dallas Time Clock chip.
My question is why would one board have the chip and one does not??
Or what is the difference between the two boards as for functionality??
Does anyone here know these boards or is this something of minimal importance and as long as it works it is not an issue??
Thanks in advance.