My first computer was a machine a business set out back to get rid of it, the machine consisted of three parts which had to be powered up one by one or a breaker would trip, the largest part had a keyboard and probably some drives in it ,when powering up it sounded like a small jet engine spooling up, the second unit contained a printer and a paper punch tape reader with a loop of yellow oily smelling paper tape looped through it and the third unit has two disk drop in disc pack about 24" across.
Once all powered up at the chicken beak I typed in what was on a note taped above the key board, the tape would run then a menu would come up where a loan amount, the interest rate, plus the length of the loan would be entered followed by pressing enter.
After about 30 seconds or so the printer would start up and print out a number of pages detailing the month by month payments amounts as applied to interest and principal.
And that was all it would do for me, I had no idea how to program it or how to get it to punch a blank tape, it was a IBM machine and probably cost someone a small fortune.
Early the following year I hauled it down to the Miami Hamfest and sold it for something like $300