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The first payroll program I wrote was on a Wang 600 programmable calculator in 1973 (the term microcomputer had not yet been invented). The machine had cassette data storage standard and optional floppy disk and hard disk. Printed output was to a Selectric typewriter and/or a calculator tape.

I also wrote and supported programs to car dealers that printed sales contracts for bank loans.

Total memory was 2k bytes. The 16 data registers used about 104 bytes leaving 1920 bytes for any programs. Of course, we used machine code and squeezed out any superflous code.