diff --git a/src/mame/drivers/fidel68k.cpp b/src/mame/drivers/fidel68k.cpp
index ab30986f9d7..fd59a10968c 100644
--- a/src/mame/drivers/fidel68k.cpp
+++ b/src/mame/drivers/fidel68k.cpp
@@ -630,6 +630,10 @@ static MACHINE_CONFIG_DERIVED( eagv11, eagv7 )
 	/* basic machine hardware */
 	MCFG_CPU_REPLACE("maincpu", M68EC040, XTAL_36MHz*2*2) // wrong! should be M68EC060 @ 72MHz
 	MCFG_CPU_PROGRAM_MAP(eagv11_map)
+
+	MCFG_CPU_PERIODIC_INT_DRIVER(fidelz80base_state, irq2_line_hold, 600)
+	MCFG_DEVICE_REMOVE("irq_on") // 8.25us is too long
+	MCFG_DEVICE_REMOVE("irq_off")
 MACHINE_CONFIG_END
 
 
diff --git a/src/mame/drivers/hh_tms1k.cpp b/src/mame/drivers/hh_tms1k.cpp
index de0275d6ff3..e14282582f9 100644
--- a/src/mame/drivers/hh_tms1k.cpp
+++ b/src/mame/drivers/hh_tms1k.cpp
@@ -7329,7 +7329,8 @@ static INPUT_PORTS_START( ss7in1 )
 	PORT_CONFNAME( 0x01, 0x00, "Players" )
 	PORT_CONFSETTING(    0x00, "1" )
 	PORT_CONFSETTING(    0x01, "2" )
-	PORT_BIT( 0x0e, IP_ACTIVE_LOW, IPT_UNUSED ) // ?
+	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNUSED )
+	PORT_BIT( 0x0c, IP_ACTIVE_LOW, IPT_UNUSED )
 INPUT_PORTS_END
 
 static MACHINE_CONFIG_START( ss7in1, ss7in1_state )
diff --git a/src/mame/drivers/novag6502.cpp b/src/mame/drivers/novag6502.cpp
index b29472d7f0b..2aff0a8543b 100644
--- a/src/mame/drivers/novag6502.cpp
+++ b/src/mame/drivers/novag6502.cpp
@@ -14,7 +14,6 @@
     - cforteb emulation (was initially sforteba romset)
     - verify supercon IRQ and beeper frequency
     - why is sforte H and 1 leds always on?
-    - sforte/sexpert RS232 port (only works in version C?)
     - printer port
 
 ******************************************************************************
@@ -43,7 +42,7 @@ Super Expert (model 878/887/902):
 - 8KB RAM battery-backed, 3*32KB ROM
 - HD44780 LCD controller (16x1)
 - beeper(32KHz/32), IRQ(32KHz/128) via MC14060
-- optional R65C51P2 ACIA @ 1.8432MHz, for IBM PC interface
+- optional R65C51P2 ACIA @ 1.8432MHz, for IBM PC interface (only works in version C?)
 - printer port, magnetic sensors, 8*8 chessboard leds
 
 I/O via TTL, hardware design was very awkward.
@@ -55,6 +54,7 @@ instead of magnet sensors.
 #include "emu.h"
 #include "cpu/m6502/m6502.h"
 #include "cpu/m6502/m65c02.h"
+#include "bus/rs232/rs232.h"
 #include "machine/mos6551.h"
 #include "machine/nvram.h"
 #include "sound/beep.h"
@@ -506,7 +506,7 @@ static ADDRESS_MAP_START( sforte_map, AS_PROGRAM, 8, novag6502_state )
 	AM_RANGE(0x1ff3, 0x1ff3) AM_WRITENOP // printer
 	AM_RANGE(0x1ff6, 0x1ff6) AM_WRITE(sforte_lcd_control_w)
 	AM_RANGE(0x1ff7, 0x1ff7) AM_WRITE(sforte_lcd_data_w)
-	AM_RANGE(0x1ffc, 0x1fff) AM_DEVREADWRITE("rs232", mos6551_device, read, write)
+	AM_RANGE(0x1ffc, 0x1fff) AM_DEVREADWRITE("acia", mos6551_device, read, write)
 	AM_RANGE(0x2000, 0x7fff) AM_ROM
 	AM_RANGE(0x8000, 0xffff) AM_ROMBANK("bank1")
 ADDRESS_MAP_END
@@ -840,10 +840,15 @@ static MACHINE_CONFIG_START( sexpert, novag6502_state )
 	MCFG_TIMER_START_DELAY(attotime::from_hz(XTAL_32_768kHz/128) - attotime::from_nsec(21500)) // active for 21.5us
 	MCFG_TIMER_DRIVER_ADD_PERIODIC("irq_off", novag6502_state, irq_off, attotime::from_hz(XTAL_32_768kHz/128))
 
-	MCFG_DEVICE_ADD("rs232", MOS6551, 0) // R65C51P2
+	MCFG_DEVICE_ADD("acia", MOS6551, 0) // R65C51P2 - RTS to CTS, DCD to GND
 	MCFG_MOS6551_XTAL(XTAL_1_8432MHz)
 	MCFG_MOS6551_IRQ_HANDLER(INPUTLINE("maincpu", M6502_NMI_LINE))
-	MCFG_MOS6551_RTS_HANDLER(DEVWRITELINE("rs232", mos6551_device, write_cts))
+	MCFG_MOS6551_RTS_HANDLER(DEVWRITELINE("acia", mos6551_device, write_cts))
+	MCFG_MOS6551_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
+	MCFG_MOS6551_DTR_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
+	MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, nullptr)
+	MCFG_RS232_RXD_HANDLER(DEVWRITELINE("acia", mos6551_device, write_rxd))
+	MCFG_RS232_DSR_HANDLER(DEVWRITELINE("acia", mos6551_device, write_dsr))
 	
 	MCFG_NVRAM_ADD_1FILL("nvram")