Change Office 3.0

During my studies in high school (1988-1992) I have programmed a lot of application software for PC-XT/AT computers with DOS (Disk Operating System). One of such application software was software called "Change Office", which did everything what Exchange Office needed to do their business. Facilitate currency exchange transactions, issue printed receipts, and perform reporting and statistical analysis.

In 1992, I had already had 3th version of this software. This version was successfully tested and certified by the State Bank of Czechoslovakia, the highest banking authority in the country at the time. Funny enough, I was just a 17-year-old student when I received the certification for my software. The certification was typed up on a typewriter!

Here's the actual certification, see below!

A certificate for my software issued by the national bank, validating its integration and functionality. Typed up on a typewriter :-)