[K0balt]

Very cool!

I recently stumbled across a cassette of the first “commercial” software I ever wrote, a simple database with an inventory tracking module for a local food co-op.

I was 14 at the time, and the software was written for the zx80/81. Around that time I also sold a simple universal list database with no rows or keys, searchable with a super simple regex type syntax. That was for use with a battery-backed RAM expansion pack, and offloaded to cassette as backup.