diff --git a/bacnet-stack/ports/pic18f6720/18F6720.lkr b/bacnet-stack/ports/pic18f6720/18F6720.lkr
index 83e05781..cba46077 100644
--- a/bacnet-stack/ports/pic18f6720/18F6720.lkr
+++ b/bacnet-stack/ports/pic18f6720/18F6720.lkr
@@ -28,11 +28,14 @@ DATABANK   NAME=gpr8       START=0x800          END=0x8FF
 DATABANK   NAME=gpr9       START=0x900          END=0x9FF
 DATABANK   NAME=gpr10      START=0xA00          END=0xAFF
 DATABANK   NAME=gpr11      START=0xB00          END=0xBFF
-DATABANK   NAME=gpr12      START=0xC00          END=0xCFF
-DATABANK   NAME=gpr13      START=0xD00          END=0xDFF
-DATABANK   NAME=gpr14      START=0xE00          END=0xEFF
+//DATABANK   NAME=gpr12      START=0xC00          END=0xCFF
+//DATABANK   NAME=gpr13      START=0xD00          END=0xDFF
+DATABANK   NAME=stackreg   START=0xC00          END=0xDFF          PROTECTED
+DATABANK   NAME=gpr14      START=0xE00          END=0xEF3
+DATABANK   NAME=dbgspr     START=0xEF4          END=0xEFF          PROTECTED
 ACCESSBANK NAME=accesssfr  START=0xF60          END=0xFFF          PROTECTED
 
 SECTION    NAME=CONFIG     ROM=config
 
-STACK SIZE=0x100 RAM=gpr14
+//STACK SIZE=0x100 RAM=gpr13
+STACK SIZE=0x200 RAM=stackreg
diff --git a/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw b/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw
index 84f8778a..8ff2aa43 100644
Binary files a/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw and b/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw differ