diff --git a/scripts/target/mame/mess.lua b/scripts/target/mame/mess.lua
index 3d36a02c25c..15d794fdf5a 100644
--- a/scripts/target/mame/mess.lua
+++ b/scripts/target/mame/mess.lua
@@ -3601,6 +3601,7 @@ files {
 	MAME_DIR .. "src/mame/drivers/besta.cpp",
 	MAME_DIR .. "src/mame/drivers/bitgraph.cpp",
 	MAME_DIR .. "src/mame/drivers/bpmmicro.cpp",
+	MAME_DIR .. "src/mame/drivers/blw700i.cpp",
 	MAME_DIR .. "src/mame/drivers/br8641.cpp",
 	MAME_DIR .. "src/mame/drivers/busicom.cpp",
 	MAME_DIR .. "src/mame/includes/busicom.h",
diff --git a/src/mame/drivers/blw700i.cpp b/src/mame/drivers/blw700i.cpp
index 7557a44164d..18f12f6bb71 100644
--- a/src/mame/drivers/blw700i.cpp
+++ b/src/mame/drivers/blw700i.cpp
@@ -75,7 +75,7 @@ READ8_MEMBER(lw700i_state::pb_r)
 		return 0;
 	}
 
-	return 0xffff;
+	return 0xff;
 }
 
 WRITE8_MEMBER(lw700i_state::pb_w)
diff --git a/src/mame/mess.flt b/src/mame/mess.flt
index 90f375d1471..ac36cee8ec8 100644
--- a/src/mame/mess.flt
+++ b/src/mame/mess.flt
@@ -94,6 +94,7 @@ bigbord2.cpp
 binbug.cpp
 bitgraph.cpp
 bk.cpp
+blw700i.cpp
 bmjr.cpp
 bml3.cpp
 bob85.cpp