+enum command_result
+command_halt (int argc, char **argv);
+
+enum command_result
+command_reset (int argc, char **argv);
+
+enum command_result
+command_status (int argc, char **argv);
+
+enum command_result
+command_info (int argc, char **argv);
+
+enum command_result
+cc_wait(void);
+
+void
+command_read (void);
+
+void
+s51_printf(char *format, ...);