First post, by abasak
I just bought a funny little Point of sale PC, a Wincor Nixdorf Beetle/M. It's configured with a PIII 1Ghz CPU, 512Mb RAM and both an ISA slot and a PCI slot. Right now it is working "fine" with a Voodoo3 PCI and a SB16 CT2940 (OPL3 version).
That is all well and good, however when I replaced the CR1/3N lithium battery, I noticed that the system still couldn't keep the BIOS setting when I pulled the power plug/or turned of the PSU. After hours of troubleshooting, BIOS updating and jumper hunting, I took out my voltmeter and noticed that the brand new battery only held a charge of 2.4v. I thought I might've bought a dead or old VARTA battery, so I had it exchanged today at around 4:30PM, now at 10:00PM the new battery is down from 3.1v to 0.6v in a matter of hours. So something is completely wrong.
There is nowhere in the BIOS to change anything related to this, and there are NO jumpers on the boards related to CMOS reset. This is after all a quirky POS (Point Of Sale, not Piece Of S**t) computer.
This is really testing me, and I'm at my wits end. Documentation is sparse, there is a 32k NVRAM chip on the board, however it seems like this is not for storing BIOS info but "This memory chip can be used to store important data - such as sales totals or diagnostic entries - by means of the appropriate software and independently of the power supply." I don't know if it is used for the BIOS as well. I have ordered a new one just to be sure. But is there a way to identify the CMOS memory on the board?
Anyway, do anyone of you guys have any suggestions? How do I troubleshoot this? Should I build some sort of AA battery pack and hook it up to test drain (how would I btw. do that?). How do I measure drain?