diff --git a/src/mame/drivers/mps1230.c b/src/mame/drivers/mps1230.c
index e557b588e03..3df393372ba 100644
--- a/src/mame/drivers/mps1230.c
+++ b/src/mame/drivers/mps1230.c
@@ -148,7 +148,7 @@ ROM_START(mps1000)
 	// ver 2.20, 06/DEC/1986 (But it could also perhaps mean 12/JUN/1986)
 	// I can't tell the PCB reference because this was dumped from spare EPROMs from a drawer
 	// The dump seems to be good because the data content of all of my 4 spare EPROMs matched perfectly.
-	ROM_LOAD( "mps_1000_vers_2.20_12-06-86.rom", 0x000000, 0x010000, CRC(0a91ea8a) SHA1(ccb679f3d1f7f4eddb4e8899fe9e9a594dcfca5d) )
+	ROM_LOAD( "mps_1000_vers_2.20_12-06-86.rom", 0x000000, 0x02000, CRC(0a91ea8a) SHA1(ccb679f3d1f7f4eddb4e8899fe9e9a594dcfca5d) )
 ROM_END
 
 ROM_START(mps1230)