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diff --git a/src/mame/includes/mtx.h b/src/mame/includes/mtx.h
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+// license:BSD-3-Clause
+// copyright-holders:Lee Ward, Dirk Best, Curt Coder
+/*************************************************************************
+
+ Memotech MTX 500, MTX 512 and RS 128
+
+*************************************************************************/
+
+#ifndef __MTX__
+#define __MTX__
+
+#include "imagedev/snapquik.h"
+#include "imagedev/cassette.h"
+#include "bus/centronics/ctronics.h"
+#include "machine/z80dart.h"
+#include "machine/z80ctc.h"
+#include "sound/sn76496.h"
+#include "machine/ram.h"
+
+#define Z80_TAG "z80"
+#define Z80CTC_TAG "z80ctc"
+#define Z80DART_TAG "z80dart"
+#define FD1793_TAG "fd1793" // SDX
+#define FD1791_TAG "fd1791" // FDX
+#define SN76489A_TAG "sn76489a"
+#define MC6845_TAG "mc6845"
+#define SCREEN_TAG "screen"
+#define CENTRONICS_TAG "centronics"
+
+class mtx_state : public driver_device
+{
+public:
+ mtx_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, Z80_TAG),
+ m_sn(*this, SN76489A_TAG),
+ m_z80ctc(*this, Z80CTC_TAG),
+ m_z80dart(*this, Z80DART_TAG),
+ m_cassette(*this, "cassette"),
+ m_centronics(*this, CENTRONICS_TAG),
+ m_ram(*this, RAM_TAG)
+ { }
+
+ required_device<cpu_device> m_maincpu;
+ required_device<sn76489a_device> m_sn;
+ required_device<z80ctc_device> m_z80ctc;
+ optional_device<z80dart_device> m_z80dart;
+ required_device<cassette_image_device> m_cassette;
+ required_device<centronics_device> m_centronics;
+ required_device<ram_device> m_ram;
+
+ /* keyboard state */
+ UINT8 m_key_sense;
+
+ /* video state */
+ UINT8 *m_video_ram;
+ UINT8 *m_attr_ram;
+
+ /* sound state */
+ UINT8 m_sound_latch;
+
+ /* timers */
+ device_t *m_cassette_timer;
+
+ int m_centronics_busy;
+ int m_centronics_fault;
+ int m_centronics_perror;
+ int m_centronics_select;
+
+ DECLARE_WRITE8_MEMBER(mtx_bankswitch_w);
+ DECLARE_WRITE8_MEMBER(mtx_sound_latch_w);
+ DECLARE_WRITE8_MEMBER(mtx_sense_w);
+ DECLARE_READ8_MEMBER(mtx_key_lo_r);
+ DECLARE_READ8_MEMBER(mtx_key_hi_r);
+ DECLARE_WRITE8_MEMBER(hrx_address_w);
+ DECLARE_READ8_MEMBER(hrx_data_r);
+ DECLARE_WRITE8_MEMBER(hrx_data_w);
+ DECLARE_READ8_MEMBER(hrx_attr_r);
+ DECLARE_WRITE8_MEMBER(hrx_attr_w);
+ DECLARE_MACHINE_START(mtx512);
+ DECLARE_MACHINE_RESET(mtx512);
+ TIMER_DEVICE_CALLBACK_MEMBER(ctc_tick);
+ TIMER_DEVICE_CALLBACK_MEMBER(cassette_tick);
+ DECLARE_WRITE_LINE_MEMBER(ctc_trg1_w);
+ DECLARE_WRITE_LINE_MEMBER(ctc_trg2_w);
+ DECLARE_WRITE_LINE_MEMBER(mtx_tms9929a_interrupt);
+ DECLARE_READ8_MEMBER(mtx_strobe_r);
+ DECLARE_READ8_MEMBER(mtx_sound_strobe_r);
+ DECLARE_WRITE8_MEMBER(mtx_cst_w);
+ DECLARE_READ8_MEMBER(mtx_prt_r);
+ DECLARE_WRITE_LINE_MEMBER(write_centronics_busy);
+ DECLARE_WRITE_LINE_MEMBER(write_centronics_fault);
+ DECLARE_WRITE_LINE_MEMBER(write_centronics_perror);
+ DECLARE_WRITE_LINE_MEMBER(write_centronics_select);
+ void bankswitch(UINT8 data);
+ DECLARE_SNAPSHOT_LOAD_MEMBER( mtx );
+};
+
+#endif /* __MTX_H__ */