vtech2: Add I/O expansion slot

This adds support for the joystick and printer.

src/mame/drivers/vtech2.cpp

@@ -61,7 +61,6 @@
     TODO:
     - Ram pak
     - undumped DOS ROM
-    - joystick
     - need software
 
     Cartslot works, even though it seems there were no game carts made
@@ -75,14 +74,12 @@
 
 #include "emu.h"
 #include "includes/vtech2.h"
-
 #include "cpu/z80/z80.h"
 #include "sound/wave.h"
-
+#include "formats/vt_cas.h"
 #include "screen.h"
 #include "speaker.h"
 
-#include "formats/vt_cas.h"
 
 
 void vtech2_state::mem_map(address_map &map)
@@ -525,6 +522,8 @@ MACHINE_CONFIG_START(vtech2_state::laser350)
 	MCFG_CASSETTE_FORMATS(vtech2_cassette_formats)
 	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_PLAY)
 
+	MCFG_IOEXP_SLOT_ADD("io")
+
 	/* cartridge */
 	MCFG_GENERIC_CARTSLOT_ADD("cartslot", generic_plain_slot, "vtech_cart")
 	MCFG_GENERIC_EXTENSIONS("rom,bin")

src/mame/includes/vtech2.h

@@ -12,6 +12,7 @@
 #include "machine/bankdev.h"
 #include "bus/generic/carts.h"
 #include "bus/generic/slot.h"
+#include "bus/vtech/ioexp/ioexp.h"
 #include "imagedev/cassette.h"
 #include "imagedev/flopdrv.h"
 #include "sound/spkrdev.h"
@@ -37,6 +38,7 @@ public:
 		, m_bankb(*this, "bankb")
 		, m_bankc(*this, "bankc")
 		, m_bankd(*this, "bankd")
+		, m_ioexp(*this, "io")
 	{ }
 
 	void laser350(machine_config &config);
@@ -84,6 +86,7 @@ private:
 	required_device<address_map_bank_device> m_bankb;
 	required_device<address_map_bank_device> m_bankc;
 	required_device<address_map_bank_device> m_bankd;
+	required_device<vtech_ioexp_slot_device> m_ioexp;
 
 	char m_laser_frame_message[64+1];
 	int m_laser_frame_time;

src/mame/machine/vtech2.cpp

@@ -8,7 +8,7 @@
     Davide Moretti <dave@rimini.com> ROM dump and hardware description
 
     TODO:
-        Printer and RS232 support.
+        RS232 support.
         Check if the FDC is really the same as in the
         Laser 210/310 (aka VZ200/300) series.
 
@@ -43,6 +43,9 @@ void vtech2_state::init_laser()
 	// check ROM expansion
 	std::string region_tag;
 	m_cart_rom = memregion(region_tag.assign(m_cart->tag()).append(GENERIC_ROM_REGION_TAG).c_str());
+
+	// setup expansion slot
+	m_ioexp->set_io_space(&m_maincpu->space(AS_IO));
 }