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diff --git a/src/mame/dms/dms86.cpp b/src/mame/dms/dms86.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/***************************************************************************
+
+Digital Microsystems DMS-86
+
+2010-01-11 Skeleton driver.
+
+Monitor commands:
+A Display incoming terminal data in hex
+B boot to HiNet
+C copy memory
+D dump memory to screen
+F fill memory
+G go (eg G address [breakpoint])
+I in port
+M memory test
+O out port (e.g. O 84 77)
+P set segment
+S write a byte to memory
+T type ascii string into the address set by D or S
+X display registers
+? help
+: load intel hex format file
+
+
+Note that bit 3 of port 82 is tested at boot. If low, the computer bypasses
+the monitor and goes straight to "Joining HiNet".
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/i86/i86.h"
+#include "machine/z80ctc.h"
+#include "machine/z80sio.h"
+#include "machine/clock.h"
+#include "bus/rs232/rs232.h"
+#include "machine/terminal.h"
+
+
+namespace {
+
+class dms86_state : public driver_device
+{
+public:
+ dms86_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_terminal(*this, "terminal")
+ , m_sio(*this, "sio%u", 1U)
+ , m_ctc(*this, "ctc")
+ { }
+
+ void dms86(machine_config &config);
+ void nmi_w(int state);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+
+private:
+ void m1_ack_w(u8 data);
+
+ u16 port9a_r();
+ u16 port9c_r();
+ void kbd_put(u8 data);
+
+ void io_map(address_map &map) ATTR_COLD;
+ void mem_map(address_map &map) ATTR_COLD;
+
+ u8 m_term_data = 0U;
+ required_device<cpu_device> m_maincpu;
+ required_device<generic_terminal_device> m_terminal;
+ required_device_array<z80sio_device, 2> m_sio;
+ required_device<z80ctc_device> m_ctc;
+};
+
+
+void dms86_state::nmi_w(int state)
+{
+ m_maincpu->set_input_line(INPUT_LINE_NMI, state);
+}
+
+
+void dms86_state::m1_ack_w(u8 data)
+{
+ m_sio[0]->z80daisy_decode(data);
+ m_sio[1]->z80daisy_decode(data);
+ m_ctc->z80daisy_decode(data);
+}
+
+
+u16 dms86_state::port9a_r()
+{
+ return m_term_data ? 0x40 : 0;
+}
+
+u16 dms86_state::port9c_r()
+{
+ u8 ret = m_term_data;
+ m_term_data = 0;
+ return ret;
+}
+
+
+void dms86_state::mem_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x00000, 0x1ffff).ram();
+ map(0xfe000, 0xfffff).rom().region("roms", 0);
+ map(0xfed03, 0xfed03).w(FUNC(dms86_state::m1_ack_w));
+}
+
+void dms86_state::io_map(address_map &map)
+{
+ map.unmap_value_high();
+ map.global_mask(0xff);
+ map(0x80, 0x87).rw(m_sio[0], FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w)).umask16(0x00ff);
+ map(0x88, 0x8f).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write)).umask16(0x00ff);
+ map(0x90, 0x97).rw(m_sio[1], FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w)).umask16(0x00ff);
+ //map(0x98, 0x99) // r SASI data read ; w SASI SEL probe
+ map(0x9A, 0x9B).r(FUNC(dms86_state::port9a_r)); // r parallel ports, status byte ; w SASI ACK strobe, SASI data write
+ // 9C,9D - no setup bytes; meant for printer // r Port P data read ; Port P data write
+ map(0x9c, 0x9d).r(FUNC(dms86_state::port9c_r));
+ map(0x9c, 0x9c).w(m_terminal, FUNC(generic_terminal_device::write));
+ //map(0x9e, 0x9f) // r SASI software reset ; w Port P AUX strobe
+}
+
+/* Input ports */
+static INPUT_PORTS_START( dms86 )
+ PORT_START("FRONT")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER) PORT_NAME("Interrupt") PORT_CODE(KEYCODE_F2) PORT_WRITE_LINE_MEMBER(FUNC(dms86_state::nmi_w))
+INPUT_PORTS_END
+
+
+void dms86_state::machine_start()
+{
+ save_item(NAME(m_term_data));
+
+ m_term_data = 0;
+}
+
+void dms86_state::kbd_put(u8 data)
+{
+ m_term_data = data;
+}
+
+void dms86_state::dms86(machine_config &config)
+{
+ /* basic machine hardware */
+ I8086(config, m_maincpu, XTAL(14'745'600) / 3); // according to the manual... hmm
+ m_maincpu->set_addrmap(AS_PROGRAM, &dms86_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &dms86_state::io_map);
+
+ // According to the manual the clock is 14,765,600 / 4 but that's wrong
+ Z80CTC(config, m_ctc, XTAL(14'745'600) / 3);
+ //m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0); // frame rate interrupt to maincpu
+ m_ctc->zc_callback<0>().set(m_sio[0], FUNC(z80sio_device::rxtxcb_w)); // SIO1 Ch B
+ m_ctc->zc_callback<1>().set(m_sio[0], FUNC(z80sio_device::txca_w)); // SIO1 Ch A
+ m_ctc->zc_callback<1>().append(m_sio[0], FUNC(z80sio_device::rxca_w));
+ m_ctc->zc_callback<2>().set(m_sio[1], FUNC(z80sio_device::rxtxcb_w)); // SIO2
+ m_ctc->zc_callback<2>().append(m_sio[1], FUNC(z80sio_device::rxca_w));
+ m_ctc->zc_callback<2>().append(m_sio[1], FUNC(z80sio_device::rxca_w));
+
+ Z80SIO(config, m_sio[0], XTAL(14'745'600) / 3);
+ m_sio[0]->out_txdb_callback().set("rs232", FUNC(rs232_port_device::write_txd));
+ m_sio[0]->out_dtrb_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
+ m_sio[0]->out_rtsb_callback().set("rs232", FUNC(rs232_port_device::write_rts));
+
+ Z80SIO(config, m_sio[1], XTAL(14'745'600) / 3);
+
+ rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, nullptr));
+ rs232.rxd_handler().set(m_sio[0], FUNC(z80sio_device::rxb_w));
+ rs232.dcd_handler().set(m_sio[0], FUNC(z80sio_device::dcdb_w)); // HiNet / Monitor switch
+ rs232.cts_handler().set(m_sio[0], FUNC(z80sio_device::ctsb_w)).invert();
+
+ GENERIC_TERMINAL(config, m_terminal, 0);
+ m_terminal->set_keyboard_callback(FUNC(dms86_state::kbd_put));
+}
+
+/* ROM definition */
+ROM_START( dms86 )
+ ROM_REGION16_LE( 0x2000, "roms", ROMREGION_ERASEFF )
+ ROM_LOAD16_BYTE( "hns-86_54-8678.bin", 0x0000, 0x1000, CRC(95f58e1c) SHA1(6fc8f087f0c887d8b429612cd035c6c1faab570c))
+ ROM_LOAD16_BYTE( "hns-86_54-8677.bin", 0x0001, 0x1000, CRC(78fad756) SHA1(ddcbff1569ec6975b8489935cdcfa80eba413502))
+ROM_END
+
+} // Anonymous namespace
+
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1982, dms86, 0, 0, dms86, dms86, dms86_state, empty_init, "Digital Microsystems", "DMS-86", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )