various I/O updates

c64/kernal/iostack/f5ed.save.s

@@ -10,4 +10,21 @@
 //
 
 SAVE:
-	STUB_IMPLEMENTATION()
+
+	// Reset status
+	jsr kernalstatus_reset
+
+#if CONFIG_MEMORY_MODEL_60K
+	// We need our helpers to get to filenames under ROMs or IO area
+	jsr install_ram_routines
+#endif
+
+	// Check whether we support the requested device
+	lda FA
+
+#if CONFIG_IEC
+	jsr iec_check_devnum_lvs
+	bcc_far save_iec
+#endif
+
+	jmp lvs_illegal_device_number