Why don't I have power?

Make sure the batt terminals are clean and tight , there may be a relay , check fuses , mega fuses and fusible links , something else may have gone bad by pure coincidence

Fuselinks, ignition switch, clutch or neutral safety switch or even a bad starter especially if it is a remanufactured unit.

1980 did need a memory saver tool. What computer it had was hard programed right in the chip.

Didn’t need. Spell check didn’t get it right.