diff --git a/src/mess/drivers/megadriv.c b/src/mess/drivers/megadriv.c
index 44fb64f6533..efe1fcfc327 100644
--- a/src/mess/drivers/megadriv.c
+++ b/src/mess/drivers/megadriv.c
@@ -738,9 +738,13 @@ MACHINE_CONFIG_END
 static MACHINE_CONFIG_DERIVED( genesis_32x_scd, genesis_32x )
 
 	MCFG_DEVICE_ADD("segacd", SEGA_SEGACD_US, 0)
+	MCFG_CDROM_ADD( "cdrom",scd_cdrom )
 
 	MCFG_MACHINE_START_OVERRIDE(md_cons_state, ms_megacd)
 
+	MCFG_DEVICE_MODIFY("cart")
+	MCFG_CARTSLOT_NOT_MANDATORY
+
 	//MCFG_QUANTUM_PERFECT_CPU("32x_master_sh2")
 MACHINE_CONFIG_END