Game Boy Printer test ROM. Tested on SameBoy & mGBA and on real hardware.
- arrows: move cursor
- A: add character
- B: backspace
- Start: print
- Select: caps lock
If you want to print a test pattern instead of on-screen text, type PAT and press Start.
Printing process in progress is indicated by the letter P on the left of the screen.
The communication errors will be reported by letter E and number of the stage on which printing failed, followed by the returned status code. FF status code can mean timeout.
On successfully completed print the preview screen will be cleared.
The protocol is well documented at https://gbdev.io/pandocs/Gameboy_Printer.html. RLE compression is disabled as most of the emulators don't support it.
