First post, by dionb
- Rank
- l33t++
Recently got myself a little unexpected gem as part of the - a Biostar (?) MB-1433UIV. That's common enough (sold one myself a few weeks back) but this is revision 7, which means 3.3V and 4V supported, as is the Cx5x86. That makes it pretty much the ultimate VLB motherboard, which was exactly what I wanted. Better yet, apart from awful HDD support (chips for XTIDE on NIC already ordered) it works perfectly with my 5x86 and other stuff.
Just one issue: CMOS settings.
The old barrel battery has been removed without visible damage. The board has a 4-pin header (JP8), which needs a jumper over 2-3 if 'internal' battery is used, otherwise an external battery can be connected to pins 1 and 4, with 1 being +. So that's what I'm trying to do:
3x AAA rechargeable batteries, fully charged (measured 3.78V on the connector pins), red positive connected to JP8 pin 1, negative connected to white (black was on wrong pin...) JP8 pin 4.
Should work? Well, it doesn't. After a few minutes without power, all settings gone. Tried inverting polarity. Same again.
Any suggestions how to get this board to remember what I tell it?