begin implementing basic text manipulation routines.

c64/basic/basic_delete_line.s

@@ -0,0 +1,9 @@
+	;; Delete the current BASIC line, which is assumed to have already
+	;; been found with basic_find_line.
+	;; Really only consists of copying memory down.
+	;; The only complication is that we have to do the copy with ROMs
+	;; banked out. Oh, yes, and we have to update all the links in
+	;; the following basic lines.
+basic_delete_line:
+	sec
+	rts