Here's a copy of some of what I found on the great CUDA mystery:
"A conversation on the TCS (the Pi's computer bulletin board) alerted us to the
possible
need to reset the "Cuda." Exactly what the "Cuda" might be (aside from a nickname
for a
1960s Dodge sports car) was a mystery. Fortunately, the TCS also had a file called
the
PowerGuide MLB 1.0.2 (File Transfer Area 3, File 704) that is an electronic guide to
the
main logic boards on Power Computing computers. The guide didn't explain what the
"Cuda" was, but it did show us where to find the Cuda reset button on the Power 100.
So we pressed the red Cuda button to reset it. It isn't clear if this resets it --
the
PowerGuide just shows where it is, not what to do with it. We pressed the Power On
key
and -- nothing. We were getting annoyed (but the distressed damsel was looking
happier
and happier).
Knowing that the Power 100 uses many standard parts also used by those other
computers, we decided to rip out the machine's power supply and see if we could get
a
replacement. As soon as we removed the power supply we noticed: a battery. A purple
battery. A purple 3.6 volt lithium battery.
One thing that can cause a Macintosh to fake its own death is: a dead battery. This
is
most often seen in old "compact" Macs (128K and 512K Macs, Mac Pluses, Mac SEs,
etc.)
or in certain desktop models (particularly the Mac IIsi, Centris 610, Quadra 610 and
Power
Mac 6100). We'd never heard of someone having a dead battery problem in a Power
Computing machine, but we decided to test the battery with our multitester.
It was dead. Now, "dead" is a relative term; a 3.6 volt battery reading 2.5 volts
will prevent
a Power Mac 6100 from booting. But this battery didn't read 2.5 volts; it read:
nothing. The
Washington Apple Pi Labs team has never seen a recently-working Mac with a
completely drained battery; we were impressed, and privately started to refer to the
machine as Bunnicula, the battery-sucking vampire.
The formerly distressed damsel was less impressed: after a quick trip to a Radio
Shack
store and the purchase of Part 23-026, "Lithium Battery: for Apple Macintosh
Computers
and Wireless Security Systems," a brand-new purple battery was installed, the Power
On
key was pressed on the keyboard and --
Apple suffered a delay in the purchase of a Power Macintosh G3. The Power Computing
Power 100 instantly sprang to life, somewhat confused about the date and location,
but
otherwise in robust good health. A quick trip to the Date & Time Control Panel, and
the
Map Control Panel, eliminated the confusion over date and location, and the Power
100
was off and running.
Nothing else was wrong. Nothing else at all: the hard disk drive was in perfect
health, all
the peripherals worked, the UPS was fully functional. In short: the only problem was
a
dead $10.95 battery."
__________________________
Bob Wulkowicz
--
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