diff --git a/src/mame/drivers/dms86.cpp b/src/mame/drivers/dms86.cpp
index bcfa8db3e28..6d6a5f4e2d1 100644
--- a/src/mame/drivers/dms86.cpp
+++ b/src/mame/drivers/dms86.cpp
@@ -143,7 +143,6 @@ MACHINE_CONFIG_START(dms86_state::dms86)
 	MCFG_Z80SIO_OUT_TXDB_CB(WRITELINE("rs232", rs232_port_device, write_txd))
 	MCFG_Z80SIO_OUT_DTRB_CB(WRITELINE("rs232", rs232_port_device, write_dtr))
 	MCFG_Z80SIO_OUT_RTSB_CB(WRITELINE("rs232", rs232_port_device, write_rts))
-	MCFG_Z80SIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_NMI))
 
 	MCFG_DEVICE_ADD("rs232", RS232_PORT, default_rs232_devices, nullptr)
 	MCFG_RS232_RXD_HANDLER(WRITELINE("sio1", z80sio_device, rxb_w))
diff --git a/src/mame/drivers/qtsbc.cpp b/src/mame/drivers/qtsbc.cpp
index 74955d84dab..3d54091e7e5 100644
--- a/src/mame/drivers/qtsbc.cpp
+++ b/src/mame/drivers/qtsbc.cpp
@@ -14,6 +14,9 @@ Chips: P8251, D8253C, MK3880N-4 (Z80). 3x 6-sw dips. Unmarked crystal.
 
 A blue jumper marked 4M and 2M (between U11 and U12) selects the CPU clock.
 
+The RS232 port uses a 26-pin header (J1) rather than the conventional DB25
+connector. The second 26-pin header (J2) is for the parallel port. 
+
 Feature list from QT ad:
 - 1K RAM (which can be located at any 1K boundary) plus one each
   Parallel and Serial I/O ports on board