diff --git a/src/devices/bus/coco/coco_multi.cpp b/src/devices/bus/coco/coco_multi.cpp
index 23a69932ef6..4c5c63c003e 100644
--- a/src/devices/bus/coco/coco_multi.cpp
+++ b/src/devices/bus/coco/coco_multi.cpp
@@ -57,16 +57,6 @@
 #include "coco_multi.h"
 
 #include "cococart.h"
-#include "coco_dcmodem.h"
-#include "coco_fdc.h"
-#include "coco_gmc.h"
-#include "coco_orch90.h"
-#include "coco_pak.h"
-#include "coco_ram.h"
-#include "coco_rs232.h"
-#include "coco_ssc.h"
-#include "coco_stecomp.h"
-#include "coco_sym12.h"
 
 #define SLOT1_TAG           "slot1"
 #define SLOT2_TAG           "slot2"
@@ -163,32 +153,13 @@ namespace
 
 static void coco_cart_slot1_3(device_slot_interface &device)
 {
-	device.option_add("banked_16k", COCO_PAK_BANKED);
-	device.option_add("dcmodem", COCO_DCMODEM);
-	device.option_add("games_master", COCO_PAK_GMC);
-	device.option_add("orch90", COCO_ORCH90);
-	device.option_add("pak", COCO_PAK);
-	device.option_add("ram", COCO_PAK_RAM);
-	device.option_add("rs232", COCO_RS232);
-	device.option_add("ssc", COCO_SSC);
-	device.option_add("stecomp", COCO_STEREO_COMPOSER);
-	device.option_add("sym12", COCO_SYM12);
+	coco_cart_add_basic_devices(device);
 }
+
 static void coco_cart_slot4(device_slot_interface &device)
 {
-	device.option_add("banked_16k", COCO_PAK_BANKED);
-	device.option_add("cc2hdb1", COCO2_HDB1);
-	device.option_add("cc3hdb1", COCO3_HDB1);
-	device.option_add("dcmodem", COCO_DCMODEM);
-	device.option_add("fdcv11", COCO_FDC_V11);
-	device.option_add("games_master", COCO_PAK_GMC);
-	device.option_add("orch90", COCO_ORCH90);
-	device.option_add("pak", COCO_PAK);
-	device.option_add("ram", COCO_PAK_RAM);
-	device.option_add("rs232", COCO_RS232);
-	device.option_add("ssc", COCO_SSC);
-	device.option_add("stecomp", COCO_STEREO_COMPOSER);
-	device.option_add("sym12", COCO_SYM12);
+	coco_cart_add_basic_devices(device);
+	coco_cart_add_fdcs(device);
 }
 
 
diff --git a/src/devices/bus/coco/cococart.cpp b/src/devices/bus/coco/cococart.cpp
index 220b0d1cab3..6dc79efefb2 100644
--- a/src/devices/bus/coco/cococart.cpp
+++ b/src/devices/bus/coco/cococart.cpp
@@ -40,6 +40,19 @@
 #include "emu.h"
 #include "cococart.h"
 
+#include "coco_dcmodem.h"
+#include "coco_fdc.h"
+#include "coco_gmc.h"
+#include "coco_multi.h"
+#include "coco_orch90.h"
+#include "coco_pak.h"
+#include "coco_psg.h"
+#include "coco_ram.h"
+#include "coco_rs232.h"
+#include "coco_ssc.h"
+#include "coco_stecomp.h"
+#include "coco_sym12.h"
+
 
 /***************************************************************************
     PARAMETERS
@@ -649,3 +662,52 @@ void device_cococart_interface::set_line_value(cococart_slot_device::line line,
 {
 	owning_slot().set_line_value(line, value);
 }
+
+
+//-------------------------------------------------
+//  coco_cart_add_basic_devices
+//-------------------------------------------------
+
+void coco_cart_add_basic_devices(device_slot_interface &device)
+{
+	// basic devices, on both the main slot and the Multi-Pak interface
+	device.option_add_internal("banked_16k", COCO_PAK_BANKED);
+	device.option_add("ccpsg", COCO_PSG);
+	device.option_add("dcmodem", COCO_DCMODEM);
+	device.option_add("games_master", COCO_PAK_GMC);
+	device.option_add("orch90", COCO_ORCH90);
+	device.option_add_internal("pak", COCO_PAK);
+	device.option_add("ram", COCO_PAK_RAM);
+	device.option_add("rs232", COCO_RS232);
+	device.option_add("ssc", COCO_SSC);
+	device.option_add("stecomp", COCO_STEREO_COMPOSER);
+	device.option_add("sym12", COCO_SYM12);
+}
+
+
+//-------------------------------------------------
+//  coco_cart_add_fdcs
+//-------------------------------------------------
+
+void coco_cart_add_fdcs(device_slot_interface &device)
+{
+	// FDCs are optional because if they are on a Multi-Pak interface, they must
+	// be on Slot 4
+	device.option_add("cc2hdb1", COCO2_HDB1);
+	device.option_add("cc3hdb1", COCO3_HDB1);
+	device.option_add("cd6809_fdc", CD6809_FDC);
+	device.option_add("cp450_fdc", CP450_FDC);
+	device.option_add("fdc", COCO_FDC);
+	device.option_add("fdcv11", COCO_FDC_V11);
+}
+
+
+//-------------------------------------------------
+//  coco_cart_add_multi_pak
+//-------------------------------------------------
+
+void coco_cart_add_multi_pak(device_slot_interface &device)
+{
+	// and the Multi-Pak itself is optional because they cannot be daisy chained
+	device.option_add("multi", COCO_MULTIPAK);
+}
diff --git a/src/devices/bus/coco/cococart.h b/src/devices/bus/coco/cococart.h
index d2a573202f0..487858425e0 100644
--- a/src/devices/bus/coco/cococart.h
+++ b/src/devices/bus/coco/cococart.h
@@ -225,4 +225,10 @@ private:
 	device_cococart_host_interface * m_host;
 };
 
+// methods for configuring CoCo slot devices (the expansion cart
+// itself, as well as slots on the Multi-Pak)
+void coco_cart_add_basic_devices(device_slot_interface &device);
+void coco_cart_add_fdcs(device_slot_interface &device);
+void coco_cart_add_multi_pak(device_slot_interface &device);
+
 #endif // MAME_BUS_COCO_COCOCART_H
diff --git a/src/mame/drivers/coco12.cpp b/src/mame/drivers/coco12.cpp
index 98c312fb371..5233d3e6948 100644
--- a/src/mame/drivers/coco12.cpp
+++ b/src/mame/drivers/coco12.cpp
@@ -26,19 +26,7 @@
 #include "emu.h"
 #include "includes/coco12.h"
 
-#include "bus/coco/coco_dcmodem.h"
-#include "bus/coco/coco_dwsock.h"
-#include "bus/coco/coco_fdc.h"
-#include "bus/coco/coco_gmc.h"
-#include "bus/coco/coco_multi.h"
-#include "bus/coco/coco_orch90.h"
-#include "bus/coco/coco_pak.h"
-#include "bus/coco/coco_psg.h"
-#include "bus/coco/coco_ram.h"
-#include "bus/coco/coco_rs232.h"
-#include "bus/coco/coco_ssc.h"
-#include "bus/coco/coco_stecomp.h"
-#include "bus/coco/coco_sym12.h"
+#include "bus/coco/cococart.h"
 #include "bus/coco/coco_t4426.h"
 
 #include "cpu/m6809/m6809.h"
@@ -402,31 +390,17 @@ INPUT_PORTS_END
 //**************************************************************************
 
 //-------------------------------------------------
-//  SLOT_INTERFACE_START(coco_cart)
+//  coco_cart
 //-------------------------------------------------
 
 void coco_cart(device_slot_interface &device)
 {
-	device.option_add("banked_16k", COCO_PAK_BANKED);
-	device.option_add("cc2hdb1", COCO2_HDB1);
-	device.option_add("cc3hdb1", COCO3_HDB1);
-	device.option_add("ccpsg", COCO_PSG);
-	device.option_add("cd6809_fdc", CD6809_FDC);
-	device.option_add("cp450_fdc", CP450_FDC);
-	device.option_add("dcmodem", COCO_DCMODEM);
-	device.option_add("fdc", COCO_FDC);
-	device.option_add("fdcv11", COCO_FDC_V11);
-	device.option_add("games_master", COCO_PAK_GMC);
-	device.option_add("multi", COCO_MULTIPAK);
-	device.option_add("orch90", COCO_ORCH90);
-	device.option_add("pak", COCO_PAK);
-	device.option_add("ram", COCO_PAK_RAM);
-	device.option_add("rs232", COCO_RS232);
-	device.option_add("ssc", COCO_SSC);
-	device.option_add("stecomp", COCO_STEREO_COMPOSER);
-	device.option_add("sym12", COCO_SYM12);
+	coco_cart_add_basic_devices(device);
+	coco_cart_add_fdcs(device);
+	coco_cart_add_multi_pak(device);
 }
 
+
 //-------------------------------------------------
 //  SLOT_INTERFACE_START(t4426_cart)
 //-------------------------------------------------