added two more BASIC commands, for testing

src/basic/,imports.s

@@ -35,6 +35,8 @@
 .label vector_reset        = KERNAL().vector_reset
 .label hw_entry_reset      = KERNAL().hw_entry_reset
 
+.label clear_screen        = KERNAL().clear_screen
+
 #if CONFIG_DBG_PRINTF
 .label printf              = KERNAL().printf
 #endif

src/basic/basic_commands_CC/cmd__jumptable_CC.s

@@ -9,14 +9,17 @@
 
 .const command_CC_list = List().add(
 
+	cmd_old,
+
 	cmd_merge,
 
 	cmd_bload,
 	cmd_bsave,
 	cmd_bverify,
 
-	cmd_old,
-	cmd_cold
+	cmd_cold,
+	cmd_clear,
+	cmd_dispose
 )
 
 

src/basic/basic_commands_CC/cmd_clear.s

@@ -0,0 +1,10 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+
+cmd_clear:
+
+	jsr clear_screen
+
+	jmp execute_statements

src/basic/basic_commands_CC/cmd_dispose.s

@@ -0,0 +1,10 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+
+cmd_dispose:
+
+	jsr varstr_garbage_collect
+
+	jmp execute_statements

src/basic/engine/varstr_garbage_collect.s

@@ -122,7 +122,8 @@ varstr_garbage_collect_check_bptr:
 
 	// Move string memory up by INDEX
 
-	// XXX
+	// XXX: set memmove__src (last byte of source), memmove__dst (last byte of destination), memmove__size (bytes to copy)
+	jsr shift_mem_up
 
 	// Update TXTPTR