diff --git a/src/mame/drivers/cit101.cpp b/src/mame/drivers/cit101.cpp
index 14a1b0582a5..3669ead7718 100644
--- a/src/mame/drivers/cit101.cpp
+++ b/src/mame/drivers/cit101.cpp
@@ -190,11 +190,17 @@ MACHINE_CONFIG_START(cit101_state::cit101)
 	MCFG_PIT8253_CLK0(6.144_MHz_XTAL / 4)
 	MCFG_PIT8253_CLK1(6.144_MHz_XTAL / 4)
 	MCFG_PIT8253_CLK2(6.144_MHz_XTAL / 4)
+	MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE("auxuart", i8251_device, write_txc))
+	MCFG_PIT8253_OUT1_HANDLER(DEVWRITELINE("auxuart", i8251_device, write_rxc))
 
 	MCFG_DEVICE_ADD("pit1", PIT8253, 0)
 	MCFG_PIT8253_CLK0(6.144_MHz_XTAL / 4)
 	MCFG_PIT8253_CLK1(6.144_MHz_XTAL / 4)
 	MCFG_PIT8253_CLK2(6.144_MHz_XTAL / 4)
+	MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE("comuart", i8251_device, write_txc))
+	MCFG_PIT8253_OUT1_HANDLER(DEVWRITELINE("comuart", i8251_device, write_rxc))
+	MCFG_PIT8253_OUT2_HANDLER(DEVWRITELINE("kbduart", i8251_device, write_txc))
+	MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("kbduart", i8251_device, write_rxc))
 
 	MCFG_DEVICE_ADD("ppi", I8255A, 0)
 	MCFG_I8255_OUT_PORTA_CB(WRITE8(cit101_state, nvr_address_w))