diff --git a/contiki-c64/uip/tfe-drv-asm.S b/contiki-c64/uip/tfe-drv-asm.S
new file mode 100644
index 0000000..d31c320
--- /dev/null
+++ b/contiki-c64/uip/tfe-drv-asm.S
@@ -0,0 +1,17 @@
+
+;---------------------------------------------------------------------       
+	.export		_cs8900a_rxtxreg
+	.export		_cs8900a_txcmd
+	.export		_cs8900a_txlen
+	.export		_cs8900a_packetpp
+	.export		_cs8900a_ppdata
+	
+
+;---------------------------------------------------------------------
+
+	_cs8900a_rxtxreg	= $de00
+	_cs8900a_txcmd		= $de04
+	_cs8900a_txlen		= $de06
+	_cs8900a_packetpp	= $de0a
+	_cs8900a_ppdata		= $de0c
+