"cmos checksum error defaults loaded" with BQ3285S RTC

[theniwo]

Hi all.

I assembled an RTC-Module with the nwX287 PCB and a BQ3285S RTC.

Now I am getting the "cmos checksum error defaults loaded".

The Battery Error is not indicated and the battery is fresh and has voltage.

I testet

• Loading BIOS or Setup defaults

• Flashing the BIOS with the latest (WI7C 040197) Award from theretroweb

• Checked continuity on all pins and legs on the RTC Module

What I noticed was that the time drifted forward and the seconds where erroraneous.

It goes like this: 1 - 19, 40, 0

What is going on here? Did I use the wrong RTC Chip?

May it be a counterfeit?

Did I damage it because it got a bit hot during soldering?

Can I rule the BIOS EEPROM out since it should be an issue with the RTC?

I have the original ODIN OEC12C887. Should I mod it to rule the BIOS EEPROM out?

[necroware]

May be the BQ3285S is defective. The BIOS chip is not related.

[necroware]

I don't think, that this is related to the module itself. Looks like an incompatibility or defect of the chip itself.