diff --git a/src/mame/drivers/macs.cpp b/src/mame/drivers/macs.cpp
index 880585d728f..1d4e6d487a1 100644
--- a/src/mame/drivers/macs.cpp
+++ b/src/mame/drivers/macs.cpp
@@ -2,7 +2,7 @@
 // copyright-holders:David Haywood
 /*
 
-macs.c - Multi Amenity Cassette System
+macs.cpp - Multi Amenity Cassette System
 
 processor seems to be ST0016 (z80 based) from SETA
 
@@ -501,8 +501,8 @@ uint8_t macs_state::dma_offset()
 	return m_cart_bank;
 }
 
-void macs_state::macs(machine_config &config)
-{
+
+MACHINE_CONFIG_START(macs_state::macs)
 	/* basic machine hardware */
 	ST0016_CPU(config, m_maincpu, 8000000); // 8 MHz ?
 	m_maincpu->set_memory_map(&macs_state::macs_mem);
@@ -519,9 +519,12 @@ void macs_state::macs(machine_config &config)
 	screen.set_palette("maincpu:palette");
 	screen.screen_vblank().set_inputline(m_maincpu, INPUT_LINE_IRQ0, HOLD_LINE); // FIXME: HOLD_LINE is bad juju
 
-	GENERIC_CARTSLOT(config, m_cart1, generic_plain_slot, "macs_cart", "rom").set_user_loadable(false);
-	GENERIC_CARTSLOT(config, m_cart2, generic_plain_slot, "macs_cart", "rom").set_user_loadable(false);
-}
+	MCFG_GENERIC_CARTSLOT_ADD_WITH_DEFAULT("slot_a", generic_plain_slot, "macs_cart", "rom")
+	MCFG_SET_IMAGE_LOADABLE(false)
+	MCFG_GENERIC_CARTSLOT_ADD_WITH_DEFAULT("slot_b", generic_plain_slot, "macs_cart", "rom")
+	MCFG_SET_IMAGE_LOADABLE(false)
+
+MACHINE_CONFIG_END
 
 
 #define MACS_BIOS \