What is the internal CR 2032 battery for?

Early 2008 Power Mac.
I read another post that it helps the computer "remember" where the boot drive or hard drive is for startup. Is that correct?
I get the flashing folder with a question mark on startup and have tried starting up from the installation disc, ran Disk Warrior, ran Apple Hardware Test, connecting to another computer to see if the tower is "recognized" as an external drive and nothing...
Just wondering if the internal battery replacement is worth a shot.
Thanks!

And if you un-select the boot volume and reselect?
What if your backup system clones? any on USB or Firewire?
My guess is not the battery (I am on original on a 8.5 yr old 1,1) but that Nvram is messed up which does happen due to a mix of faulty USB Apple kb or mouse and / or PCIe cards - and all such cards and devices need to be removed and unplugged to "clear things up.,"
Sometimes moving the drive sled to another drive bay or sled.
Do the two resets with nothing no boot drive present - just slide it out 50%.
And try using another PC keyboard and mouse, one that lacks any NVRAM or firmware actually.
Leaving Apple keyboard out for a week or two can 'bring it back' and let you continue to use it.
Don't ignore any USB device or cable or extension.
The nice part is that a decent keyboard and mouse and even extension cost under $25 for all three.
http://www.amazon.com/Microsoft-Wired-Keyboard-Business-White/dp/B004SUIMGW/ ~ $11
http://www.amazon.com/Microsoft-Comfort-Mouse-4500-Blue/dp/B003BEDPHW/ - grey $13

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Go to Solution.

Hi Kirco,
I have some more information for you :-)
I haven't been able to speak to the developer who is the most familiar with TIO programming since he's out of the office, but I have come across his notes from when he was writing support for the DAQmx driver.
As I described earlier, the HW_Arm_Sel bits don't select a connector I/O pin, but an internal trigger signal. There are seven internal trigger lines, and the HW_Arm_Sel bits map directly to the internal trigger signal: 0b000 - 0b111 map to 0d0 - 0d7. In order to route an I/O pin to an internal trigger, you must also write to a few more registers.
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TB_0_LevelEdgeReg :: Offset 0x660
TG_0_LevelEdgeReg is only 8 bits wide, and maps as follows:
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EdgeMode determines whether the TIO will detect an edge of the incoming signal, or just pass the signal level straight through. When detecting edges, it will latch the signal and generate a single TIMEBASE3 pulse instead. 0b00 sets level mode; 0b01 sets rising edge; 0b10 sets falling edge; 0b11 sets either edge.
TG_0_CombinationReg :: Offset 0x6A0
TG_0_CombinationReg is 32 bits wide, and has three fields of interest:
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5..4: CombTypeB
1..0: CombTypeA
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CombTypeB is similar to CombTypeA, and although you won't be using trigger B, set it to 0b01 to be safe.
CombFunction performs a simple logic function on A and B. Since you're only using a single I/O connector, you only need the A output, so set these bits to 0b1100.
All of the other bits should be set to 0b0.
Unfortunately, I'm unable to test these statements since my test machine is currently being used for another research project. Please let me know what happens if you decide to test.
Joe Friedchicken
NI VirtualBench Application Software
Get with your fellow hardware users :: [ NI's VirtualBench User Group ]
Get with your fellow OS users :: [ NI's Linux User Group ] [ NI's OS X User Group ]
Get with your fellow developers :: [ NI's DAQmx Base User Group ] [ NI's DDK User Group ]
Senior Software Engineer :: Multifunction Instruments Applications Group
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)

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