Yes, you can not enter the BIOS with a dead Dallas chip on that board. You can't enter the BIOS with an invalid time/date set either, so this is actually more complicated. First, fix the Dallas. After that, connect a floppy and boot DOS. Set the time/date and reboot. Now you can enter the BIOS.

If you don't care about the BIOS settings, you can get around all this by permanently setting the clear CMOS jumper. This works with a dead Dallas as well, but of course the system will always start with default settings.

Some food for thought:
DS12887 drop-in replacement
http://www.mcamafia.de/mcapage0/dsrework.htm
https://www.classic-computers.org.nz/blog/200 … attery-chip.htm

Thanks for the answers. Indeed i could enter the bios while clear cmos is on.
Next step will start soon; thanks for those links...

And thanks again.

I desoldered the dallas (After extensive training one a dead card) and soldered a socket into the place.

After i added the battery i plugged it in and was disappointed.

I couldn't enter the bios even when the jumper was on clr. After a beer i tryed flashing it with a bios and it WORKS!

Yes, you should use the last BIOS, version 1.00.16.AX1. Earlier ones have so many bugs preventing you from even entering the BIOS. The last one isn't perfect either, but at least it kind of works.