diff --git a/tools/tests/zasm/test6.asm b/tools/tests/zasm/test6.asm
index 648a642..8bb4ca7 100644
--- a/tools/tests/zasm/test6.asm
+++ b/tools/tests/zasm/test6.asm
@@ -1,3 +1,8 @@
-add	a, b
+.equ	RAMSTART	0x4000
+.equ	ACIA_CTL	0x80	; Control and status. RS off.
+.equ	ACIA_IO		0x81	; Transmit. RS on.
+
 #include "core.asm"
-inc	b
+#include "parse.asm"
+.equ	ACIA_RAMSTART	RAMSTART
+#include "acia.asm"