The Remote Serial Monitor is a handy tool to help you debug the MEGA65 System.

Documentation exists for it in the following locations:

• C65GS System Notes
  • See the “4.3 Remote Serial Monitor (handy for debugging)” section
• https://github.com/Ben-401/c65gs/blob/dockit/doc/monitor.md
  • Some extra usage info exists in this page of Ben's fork of the github repo
• Typing “?” within the monitor (via your terminal app) to see a list of slightly outdated commands