Don't fix what isn't broken: https://www.tomshardware.com/desktops/indiana-bakery-still-using-commodore-64s-originally-released-in-1982-as-point-of-sale-terminals

In my professional opinion this is the best malware protected setup I have seen for years.

Indiana bakery still using Commodore 64s originally released in 1982 as cash registers — Hilligoss Bakery in Brownsburg sticks to the BASICs

If it ain't broke...

Tom's Hardware

@masek

The Commodore engineers themselves are still amazed any of them are running.

Al Charpentier who created the video chip and roms said they didn't expect any of them to run after ten years or so.