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diff --git a/src/zexall/zexall.cpp b/src/zexall/zexall.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Jonathan Gevaryahu, Robbbert
+/******************************************************************************
+*
+* Self Contained zexall 'Z80 instruction exerciser' test driver
+* Zexall originally written by Frank Cringle for ZX Spectrum
+* Modularized Spectrum-independent Zexall binary supplied by Blargg
+* Serial interface binary/preloader at 0x0000-0x00FF written by Kevin 'kevtris' Horton
+*
+*
+* mem map:
+Ram 0000-FFFF (preloaded with binary)
+Special calls take place for three ram values (this interface was designed by kevtris):
+FFFD - 'ack' - shared ram with output device; z80 reads from here and considers the byte at FFFF read if this value incremented
+FFFE - 'req' - shared ram with output device; z80 writes an incrementing value to FFFE to indicate that there is a byte waiting at FFFF and hence requesting the output device on the other end do something about it, until FFFD is incremented by the output device to acknowledge receipt
+FFFF - 'data' - shared ram with output device; z80 writes the data to be sent to output device here
+One i/o port is used:
+0001 - bit 0 controls whether interrupt timer is enabled (1) or not (0), this is a holdover from a project of kevtris' and can be ignored.
+
+******************************************************************************/
+
+/* Core includes */
+#include "emu.h"
+#include "cpu/z80/z80.h"
+
+#include "zexall.h"
+
+class zexall_state : public driver_device
+{
+public:
+ zexall_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_main_ram(*this, "main_ram"),
+ m_out_data(0),
+ m_out_req(0),
+ m_out_req_last(0),
+ m_out_ack(0)
+ {
+ }
+
+ DECLARE_READ8_MEMBER( zexall_output_ack_r );
+ DECLARE_READ8_MEMBER( zexall_output_req_r );
+ DECLARE_READ8_MEMBER( zexall_output_data_r );
+ DECLARE_WRITE8_MEMBER( zexall_output_ack_w );
+ DECLARE_WRITE8_MEMBER( zexall_output_req_w );
+ DECLARE_WRITE8_MEMBER( zexall_output_data_w );
+ DECLARE_DRIVER_INIT(zexall);
+private:
+ required_device<cpu_device> m_maincpu;
+ required_shared_ptr<UINT8> m_main_ram;
+ UINT8 m_out_data; // byte written to 0xFFFF
+ UINT8 m_out_req; // byte written to 0xFFFE
+ UINT8 m_out_req_last; // old value at 0xFFFE before the most recent write
+ UINT8 m_out_ack; // byte written to 0xFFFC
+ virtual void machine_reset() override;
+ std::string terminate_string;
+};
+
+DRIVER_INIT_MEMBER(zexall_state,zexall)
+{
+ m_out_ack = 0;
+ m_out_req = 0;
+ m_out_req_last = 0;
+ m_out_data = 0;
+}
+
+void zexall_state::machine_reset()
+{
+ // rom is self-modifying, so need to refresh it on each run
+ // fill main ram with zexall code
+ memcpy(m_main_ram, zexall_program, 0x228a);
+}
+
+READ8_MEMBER( zexall_state::zexall_output_ack_r )
+{
+// spit out the byte in out_byte if out_req is not equal to out_req_last
+ if (m_out_req != m_out_req_last)
+ {
+ osd_printf_info("%c",m_out_data);
+ if (m_out_data != 10 && m_out_data != 13) terminate_string += m_out_data; else terminate_string = "";
+ if (terminate_string == "Tests complete") machine().schedule_exit();
+ m_out_req_last = m_out_req;
+ m_out_ack++;
+ }
+ return m_out_ack;
+}
+
+WRITE8_MEMBER( zexall_state::zexall_output_ack_w )
+{
+ m_out_ack = data;
+}
+
+READ8_MEMBER( zexall_state::zexall_output_req_r )
+{
+ return m_out_req;
+}
+
+WRITE8_MEMBER( zexall_state::zexall_output_req_w )
+{
+ m_out_req_last = m_out_req;
+ m_out_req = data;
+}
+
+READ8_MEMBER( zexall_state::zexall_output_data_r )
+{
+ return m_out_data;
+}
+
+WRITE8_MEMBER( zexall_state::zexall_output_data_w )
+{
+ m_out_data = data;
+}
+
+/******************************************************************************
+ Address Maps
+******************************************************************************/
+
+static ADDRESS_MAP_START(z80_mem, AS_PROGRAM, 8, zexall_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x0000, 0xfffc) AM_RAM AM_SHARE("main_ram")
+ AM_RANGE(0xfffd, 0xfffd) AM_READWRITE(zexall_output_ack_r,zexall_output_ack_w)
+ AM_RANGE(0xfffe, 0xfffe) AM_READWRITE(zexall_output_req_r,zexall_output_req_w)
+ AM_RANGE(0xffff, 0xffff) AM_READWRITE(zexall_output_data_r,zexall_output_data_w)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(z80_io, AS_IO, 8, zexall_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x0001, 0x0001) AM_NOP // really a disable/enable for some sort of interrupt timer on kev's hardware, which is completely irrelevant for the zexall test
+ADDRESS_MAP_END
+
+
+/******************************************************************************
+ Input Ports
+******************************************************************************/
+static INPUT_PORTS_START( zexall )
+INPUT_PORTS_END
+
+/******************************************************************************
+ Machine Drivers
+******************************************************************************/
+
+static MACHINE_CONFIG_START( zexall, zexall_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", Z80, XTAL_3_579545MHz)
+ MCFG_CPU_PROGRAM_MAP(z80_mem)
+ MCFG_CPU_IO_MAP(z80_io)
+MACHINE_CONFIG_END
+
+
+
+/******************************************************************************
+ ROM Definitions
+******************************************************************************/
+
+ROM_START(zexall)
+ ROM_REGION(0x0, "romcode", 0)
+ROM_END
+
+
+
+/******************************************************************************
+ Drivers
+******************************************************************************/
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 2009, zexall, 0, 0, zexall, zexall, zexall_state, zexall, "Frank Cringle & MESSDEV", "ZEXALL Z80 instruction set exerciser (modified for MESS)", MACHINE_NO_SOUND_HW )