The PPC640 is used in the memory erasing process at Joel's apartment.
Suspending disbelief on the whole memory-erasing thing, this would still have been a 16-year-old machine in 2004.
Year of feature (shown above)
The PPC640 doesn't have a backlit screen
PPC did not have a back-lit screen. At least not those I tested.
I would give it the credit that scientific equipment in realife is frequently interfaced with incredibly old computers. I use spectrometers controlled by computers that are 22 years old and can't be replaced as it uses a VESA local bus card and very specific software.