A hardware keyboard encoder for the TRS-80 Color Computer
v1.2 - initial commit
v1.21 - added switching between emulators with Shift+Enter to support CoCo1/2 keyboards
v1.22 - added Ctrl+'@' to emulate '@' keypress and Ctrl+'Left-Arrow' to emulate destructive backspace
v1.23 - added better support for OS-9 Ctrl+ keystrokes