Precautions:
DO NOT USE ANY OTHER POWER SUPPLY THAN THE ONE PROVIDED.
THE REASON: Back in the 80s the DC power was often connected in the opposite way from modern PSUs on many computers I.E. Positive and negative are reversed. IF YOU USE A MODERN PSU YOU WILL DAMAGE YOUR COMPUTER, MAYBE IRREVERSIBLY.
Generally:
Because of the age of these computers, it is recommended that as a precaution you DO NOT leave the computer power supply (PSU) & the computer powered up unattended or if the computer is for a child when an adult is not present.
Treat the computer with some respect – they are too old to be handled roughly.