diff --git a/configs/README.txt b/configs/README.txt
index 6646c6964c4..ea9dedaf8da 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -340,7 +340,7 @@ configs/z16f2800100zcog
 
 configs/z8encore000zco
     z8Encore! Microncontroller.  This port use the Zilog z8encore000zco
-    development kit, Z8F642 part, and the Zilog ZDS-II Windows command line
+    development kit, Z8F6403 part, and the Zilog ZDS-II Windows command line
     tools.  The development environment is Cygwin under WinXP.
 
 configs/z80zim
diff --git a/configs/z8encore000zco/ostest/defconfig b/configs/z8encore000zco/ostest/defconfig
index 5fa382a5935..63ea9ff16a0 100644
--- a/configs/z8encore000zco/ostest/defconfig
+++ b/configs/z8encore000zco/ostest/defconfig
@@ -60,7 +60,7 @@ CONFIG_ARCH=z80
 CONFIG_ARCH_Z8=y
 CONFIG_ARCH_CHIP=z8
 CONFIG_ARCH_CHIP_Z8=y
-CONFIG_ARCH_CHIP_Z8F642=y
+CONFIG_ARCH_CHIP_Z8F6403=y
 CONFIG_ARCH_BOARD=z8encore000zco
 CONFIG_ARCH_BOARD_Z8ENCORE000ZCO=y
 CONFIG_BOARD_LOOPSPERMSEC=1250