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-rw-r--r--src/mame/drivers/mekd2.c426
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diff --git a/src/mame/drivers/mekd2.c b/src/mame/drivers/mekd2.c
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+++ b/src/mame/drivers/mekd2.c
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+// license:GPL-2.0+
+// copyright-holders:Juergen Buchmueller, Robbbert
+/******************************************************************************
+ Motorola Evaluation Kit 6800 D2
+ MEK6800D2
+
+ system driver
+
+ Juergen Buchmueller, Jan 2000
+ 2013-06-16 Working driver [Robbbert]
+
+ memory map
+
+ range short description
+ 0000-00ff RAM 256 bytes RAM
+ 0100-01ff RAM optional 256 bytes RAM
+ 6000-63ff PROM optional PROM
+ or
+ 6000-67ff ROM optional ROM
+ 8004-8007 PIA expansion port
+ 8008-8009 ACIA cassette interface
+ 8020-8023 PIA keyboard interface
+ a000-a07f RAM 128 bytes RAM (JBUG scratch)
+ c000-c3ff PROM optional PROM
+ or
+ c000-c7ff ROM optional ROM
+ e000-e3ff ROM JBUG monitor program
+ e400-ffff -/- mirrors of monitor rom
+
+
+Enter the 4 digit address then the command key:
+
+ - M : Examine and Change Memory (example: E000M, then G to skip to next, ESC to exit)
+ - E : Escape (abort) operation (ESC key in our emulation)
+ - R : Examine Registers
+ - G : Begin execution at specified address
+ - P : Punch data from memory to magnetic tape
+ - L : Load memory from magnetic tape
+ - N : Trace one instruction
+ - V : Set (and remove) breakpoints
+
+The keys are laid out as:
+
+ P L N V
+
+ 7 8 9 A M
+ 4 5 6 B E
+ 1 2 3 C R
+ 0 F E D G
+
+
+Pasting:
+ 0-F : as is
+ NEXT : ^
+ MEM : =
+ GO : ^
+
+Test Paste:
+ HA030=11^22^33^44^55^66^77^88^99^HA030=
+ Now press up-arrow to confirm the data has been entered.
+
+ If you wish to follow the tutorial in the manual, here is the test
+ program that you need to enter in step 1:
+ H0020=8E^00^FF^4F^C6^04^CE^00^10^AB^00^08^5A^26^FA^97^15^3F^H
+
+ Save the above program to tape:
+ HA002=00^20^00^32^HP (A002 has start address, A004 has end address, big endian)
+
+TODO
+ Display should go blank during cassette operations
+
+
+******************************************************************************/
+
+#include "emu.h"
+#include "cpu/m6800/m6800.h"
+#include "machine/6821pia.h"
+#include "machine/6850acia.h"
+#include "machine/clock.h"
+#include "imagedev/cassette.h"
+#include "imagedev/snapquik.h"
+#include "sound/wave.h"
+#include "mekd2.lh"
+
+#define XTAL_MEKD2 1228800
+
+class mekd2_state : public driver_device
+{
+public:
+ enum
+ {
+ TIMER_TRACE
+ };
+
+ mekd2_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_pia_s(*this, "pia_s"),
+ m_pia_u(*this, "pia_u"),
+ m_acia(*this, "acia"),
+ m_cass(*this, "cassette")
+ { }
+
+ DECLARE_READ_LINE_MEMBER(mekd2_key40_r);
+ DECLARE_READ8_MEMBER(mekd2_key_r);
+ DECLARE_WRITE_LINE_MEMBER(mekd2_nmi_w);
+ DECLARE_WRITE8_MEMBER(mekd2_digit_w);
+ DECLARE_WRITE8_MEMBER(mekd2_segment_w);
+ DECLARE_QUICKLOAD_LOAD_MEMBER(mekd2_quik);
+ DECLARE_WRITE_LINE_MEMBER(cass_w);
+ TIMER_DEVICE_CALLBACK_MEMBER(mekd2_c);
+ TIMER_DEVICE_CALLBACK_MEMBER(mekd2_p);
+
+protected:
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+
+private:
+ UINT8 m_cass_data[4];
+ UINT8 m_segment;
+ UINT8 m_digit;
+ UINT8 m_keydata;
+ bool m_cass_state;
+ bool m_cassold;
+ required_device<cpu_device> m_maincpu;
+ required_device<pia6821_device> m_pia_s;
+ required_device<pia6821_device> m_pia_u;
+ required_device<acia6850_device> m_acia;
+ required_device<cassette_image_device> m_cass;
+};
+
+
+
+/***********************************************************
+
+ Address Map
+
+************************************************************/
+
+static ADDRESS_MAP_START( mekd2_mem , AS_PROGRAM, 8, mekd2_state)
+ AM_RANGE(0x0000, 0x00ff) AM_RAM // user ram
+ AM_RANGE(0x8004, 0x8007) AM_DEVREADWRITE("pia_u", pia6821_device, read, write)
+ AM_RANGE(0x8008, 0x8008) AM_DEVREADWRITE("acia", acia6850_device, status_r, control_w)
+ AM_RANGE(0x8009, 0x8009) AM_DEVREADWRITE("acia", acia6850_device, data_r, data_w)
+ AM_RANGE(0x8020, 0x8023) AM_DEVREADWRITE("pia_s", pia6821_device, read, write)
+ AM_RANGE(0xa000, 0xa07f) AM_RAM // system ram
+ AM_RANGE(0xe000, 0xe3ff) AM_ROM AM_MIRROR(0x1c00) /* JBUG ROM */
+ADDRESS_MAP_END
+
+/***********************************************************
+
+ Keys
+
+************************************************************/
+
+static INPUT_PORTS_START( mekd2 )
+ PORT_START("X0")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (hex)") PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+
+ PORT_START("X1")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+
+ PORT_START("X2")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+
+ PORT_START("X3")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+
+ PORT_START("X4")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('P') // save tape
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('L') // load tape
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('N') // trace (step)
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('V') // breakpoint
+
+ PORT_START("X5")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('=') // memory
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (escape)") PORT_CODE(KEYCODE_ESC) PORT_CHAR('H')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('R') // regs
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_UP) PORT_CHAR('^') // go, next
+INPUT_PORTS_END
+
+
+/***********************************************************
+
+ Trace hardware (what happens when N is pressed)
+
+************************************************************/
+
+void mekd2_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ switch (id)
+ {
+ case TIMER_TRACE:
+ m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
+ break;
+ default:
+ assert_always(FALSE, "Unknown id in mekd2_state::device_timer");
+ }
+}
+
+
+WRITE_LINE_MEMBER( mekd2_state::mekd2_nmi_w )
+{
+ if (state)
+ m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
+ else
+ timer_set(attotime::from_usec(18), TIMER_TRACE);
+}
+
+
+
+/***********************************************************
+
+ Keyboard
+
+************************************************************/
+
+READ_LINE_MEMBER( mekd2_state::mekd2_key40_r )
+{
+ return BIT(m_keydata, 6);
+}
+
+READ8_MEMBER( mekd2_state::mekd2_key_r )
+{
+ char kbdrow[4];
+ UINT8 i;
+ m_keydata = 0xff;
+
+ for (i = 0; i < 6; i++)
+ {
+ if (BIT(m_digit, i))
+ {
+ sprintf(kbdrow,"X%d",i);
+ m_keydata &= ioport(kbdrow)->read();
+ }
+ }
+
+ i = 0x80;
+ if (m_digit < 0x40)
+ i = BIT(m_keydata, 0) ? 0x80 : 0;
+ else
+ if (m_digit < 0x80)
+ i = BIT(m_keydata, 1) ? 0x80 : 0;
+ else
+ if (m_digit < 0xc0)
+ i = BIT(m_keydata, 2) ? 0x80 : 0;
+ else
+ i = BIT(m_keydata, 3) ? 0x80 : 0;
+
+ return i | m_segment;
+}
+
+
+
+/***********************************************************
+
+ LED display
+
+************************************************************/
+
+WRITE8_MEMBER( mekd2_state::mekd2_segment_w )
+{
+ m_segment = data & 0x7f;
+}
+
+WRITE8_MEMBER( mekd2_state::mekd2_digit_w )
+{
+ UINT8 i;
+ if (data < 0x3f)
+ {
+ for (i = 0; i < 6; i++)
+ {
+ if (BIT(data, i))
+ output_set_digit_value(i, ~m_segment & 0x7f);
+ }
+ }
+ m_digit = data;
+}
+
+
+
+/***********************************************************
+
+ Interfaces
+
+************************************************************/
+
+WRITE_LINE_MEMBER( mekd2_state::cass_w )
+{
+ m_cass_state = state;
+}
+
+QUICKLOAD_LOAD_MEMBER( mekd2_state, mekd2_quik )
+{
+ static const char magic[] = "MEK6800D2";
+ char buff[9];
+ UINT16 addr, size;
+ UINT8 ident, *RAM = memregion("maincpu")->base();
+
+ image.fread(buff, sizeof (buff));
+ if (memcmp(buff, magic, sizeof (buff)))
+ {
+ logerror("mekd2 rom load: magic '%s' not found\n", magic);
+ return IMAGE_INIT_FAIL;
+ }
+ image.fread(&addr, 2);
+ addr = LITTLE_ENDIANIZE_INT16(addr);
+ image.fread(&size, 2);
+ size = LITTLE_ENDIANIZE_INT16(size);
+ image.fread(&ident, 1);
+ logerror("mekd2 rom load: $%04X $%04X $%02X\n", addr, size, ident);
+ while (size-- > 0)
+ image.fread(&RAM[addr++], 1);
+
+ return IMAGE_INIT_PASS;
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(mekd2_state::mekd2_c)
+{
+ m_cass_data[3]++;
+
+ if (m_cass_state != m_cassold)
+ {
+ m_cass_data[3] = 0;
+ m_cassold = m_cass_state;
+ }
+
+ if (m_cass_state)
+ m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz
+ else
+ m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(mekd2_state::mekd2_p)
+{
+ /* cassette - turn 1200/2400Hz to a bit */
+ m_cass_data[1]++;
+ UINT8 cass_ws = (m_cass->input() > +0.03) ? 1 : 0;
+
+ if (cass_ws != m_cass_data[0])
+ {
+ m_cass_data[0] = cass_ws;
+ m_acia->write_rxd((m_cass_data[1] < 12) ? 1 : 0);
+ m_cass_data[1] = 0;
+ }
+}
+
+/***********************************************************
+
+ Machine
+
+************************************************************/
+
+static MACHINE_CONFIG_START( mekd2, mekd2_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", M6800, XTAL_MEKD2 / 2) /* 614.4 kHz */
+ MCFG_CPU_PROGRAM_MAP(mekd2_mem)
+
+ MCFG_DEFAULT_LAYOUT(layout_mekd2)
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette")
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
+
+ MCFG_CASSETTE_ADD("cassette")
+
+ /* Devices */
+ MCFG_DEVICE_ADD("pia_s", PIA6821, 0)
+ MCFG_PIA_READPA_HANDLER(READ8(mekd2_state, mekd2_key_r))
+ MCFG_PIA_READCB1_HANDLER(READLINE(mekd2_state, mekd2_key40_r))
+ MCFG_PIA_WRITEPA_HANDLER(WRITE8(mekd2_state, mekd2_segment_w))
+ MCFG_PIA_WRITEPB_HANDLER(WRITE8(mekd2_state, mekd2_digit_w))
+ MCFG_PIA_CA2_HANDLER(WRITELINE(mekd2_state, mekd2_nmi_w))
+ MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6800_cpu_device, nmi_line))
+ MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6800_cpu_device, nmi_line))
+
+ MCFG_DEVICE_ADD("pia_u", PIA6821, 0)
+ MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6800_cpu_device, irq_line))
+ MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6800_cpu_device, irq_line))
+
+ MCFG_DEVICE_ADD("acia", ACIA6850, 0)
+ MCFG_ACIA6850_TXD_HANDLER(WRITELINE(mekd2_state, cass_w))
+
+ MCFG_DEVICE_ADD("acia_tx_clock", CLOCK, XTAL_MEKD2 / 256) // 4800Hz
+ MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("acia", acia6850_device, write_txc))
+
+ MCFG_DEVICE_ADD("acia_rx_clock", CLOCK, 300) // toggled by cassette circuit
+ MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("acia", acia6850_device, write_rxc))
+
+ MCFG_TIMER_DRIVER_ADD_PERIODIC("mekd2_c", mekd2_state, mekd2_c, attotime::from_hz(4800))
+ MCFG_TIMER_DRIVER_ADD_PERIODIC("mekd2_p", mekd2_state, mekd2_p, attotime::from_hz(40000))
+
+ MCFG_QUICKLOAD_ADD("quickload", mekd2_state, mekd2_quik, "d2", 1)
+MACHINE_CONFIG_END
+
+/***********************************************************
+
+ ROMS
+
+************************************************************/
+
+ROM_START(mekd2)
+ ROM_REGION(0x10000,"maincpu",0)
+ ROM_LOAD("jbug.rom", 0xe000, 0x0400, CRC(5ed08792) SHA1(b06e74652a4c4e67c4a12ddc191ffb8c07f3332e) )
+ROM_END
+
+/***************************************************************************
+
+ Game driver(s)
+
+***************************************************************************/
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1977, mekd2, 0, 0, mekd2, mekd2, driver_device, 0, "Motorola", "MEK6800D2" , 0 )