First version of TFE register spec
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
+