LCD Controller Program Update

Around 18 years ago I made a program to control a 'Cooltek' LCD display over the parallel port from a PC. Since parallel ports are hard to come by these days I had to make an update. I happened to have a Arduino Nano R4 lying around so I decided to use that one. Many of the Arduinos, including the Nano R4, uses 5V GPIO levels which makes things simpler since no level shifters are needed to…