- Makefile: updated program name in title comment
- cngt.c (do_key): "l" moved left, like "h"
- cngt.c (main): when starting, immediately move to initial position
- getkey.c (tty_open): open /dev/tty read-only, not write-only
- Makefile: basic Makefile
- cngt.c: argument processing and main loop
- serial.h, serial.c: serial port output for MDX-15/20, from cncmap/millp/
- getkey.h, getkey.c: single-key (raw) TTY input
