begin implementing framework for interpreting BASIC statements.

c64/basic/basic_execute_line.s

@@ -0,0 +1,11 @@
+	;; Go through the line until its end is reached.
+	;; If we reach the end are in direct mode, then
+	;; go back to reading input, else look for the
+	;; next line, and advance to that, or else
+	;; return to READY prompt because we have run out
+	;; of program.
+
+basic_execute_line:	
+
+
+	jmp basic_main_loop