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-// license:BSD-3-Clause
-// copyright-holders:Miodrag Milanovic, Robbbert
-/***************************************************************************
-
-MMD-2 driver by Miodrag Milanovic
-
-2009-05-12 Initial version
-2011-01-12 MMD2 working [Robbbert]
-
-
-http://www.cs.unc.edu/~yakowenk/classiccmp/mmd2/
-Memory map:
-
- * 4K RAM addresses $0000..$0FFF
- * ROM addresses $D800..$E7FF
- * 256 bytes of RAM, ($FC00..$FCFF?)
-
-DIP switches:
-
- * WE 0 - Write enable for addresses $0000..$03FF
- * WE 1 - Write enable for addresses $0400..$07FF
- * WE 2 - Write enable for addresses $0800..$0BFF
- * WE 3 - Write enable for addresses $0C00..$0FFF
- * SPARE - ???
- * HEX OCT - choose display and entry to be in Hexadecimal or Octal
- * PUP RESET - ???
- * EXEC USER - update binary LED's with data entry? Or not?
- (in either setting, outputs to ports 0,1,2 still show)
-
-Operation:
-
- * Enter bytes on the keypad of hex digits
- * Set MSByte of address by entering it on the keypad & pressing "HIGH".
- * ... LSByte ... "LOW"
- * Change contents of memory at the selected address by entering the new value & pressing "STORE".
- * Look at adjacent memory locations with "NEXT" and "PREV".
- * Execute the program at the selected address by pressing "GO".
-
-AUX functions:
-
- * BRL HI # - OFF disables BRL LO
- * BRL LO #
- * STEP #
- * SRC HI # - source for COPY/DUMP - OFF disables "DUMP" function
- * DES HI # - destination for COPY/DUMP
- * LEN HI # - length for COPY/DUMP
- * CLR TST ON - test if PROM is empty
- * POP PRM ON - program a PROM
- * DUP TST ON - test if PROM duplicated okay
- * PROM 2708/2716
- * MEM MAP RAM/ROM
- * BAUD 110/150/300/600/1200
-
-The memory map can be rearranged by the system by using IN5, IN6, IN7.
-A pair of undumped proms control what goes where on each map.
-Each set of ROMs also has its own pair of PROMs.
-
-
-I/O ports:
-IN0: user expansion
-IN1: 0-TTYIN, 1-CASSIN, 3-SW8(binary/ports), 4-SW7(reset/pup), 5-SW6(hex/oct), 6-(pup signal)
-IN3: 8279 status
-IN4: 8279 key
-IN5: set MAP1
-IN6: set MAP2
-IN7: set MAP3
-IN8: read eprom (in the eprom programmer)
-OUT0: PORT0 LEDs
-OUT1: PORT1 LEDs
-OUT2: PORT2 LEDs
-OUT3: 8279 control
-OUT4: 8279 7-segment LED data
-OUT5: TTYOUT, CASSOUT
-OUT9: turn pup signal off
-OUTA: programming pulse on/off (eprom programmer)
-
-Dips:
-SW1-4 hardware control of RAM being writable
-SW5 not used
-SW6 Control if the 7-segment displays show Octal (low) or Hex (high).
-SW7 Reset only causes the cpu to perform a warm start. PUP does a cold start (Power-UP).
-SW8 Control if the PORT displays echo the 7-segment displays (high), or just act as normal output ports (low).
-
-
-ToDo
-- Hook up WE0-3
-- tty rs232 interface
-- Add interrupt module (INTE LED is always on atm)
-- Need software
-- Probably lots of other things
-
-****************************************************************************/
-
-#include "emu.h"
-#include "cpu/i8085/i8085.h"
-#include "machine/i8279.h"
-#include "imagedev/cassette.h"
-#include "speaker.h"
-#include "mmd2.lh"
-
-
-class mmd2_state : public driver_device
-{
-public:
- mmd2_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag)
- , m_maincpu(*this, "maincpu")
- , m_cass(*this, "cassette")
- , m_banks(*this, "bank%u", 1U)
- , m_io_keyboard(*this, "X%u", 0)
- , m_io_dsw(*this, "DSW")
- , m_digits(*this, "digit%u", 0U)
- , m_p(*this, "p%u_%u", 0U, 0U)
- , m_led_halt(*this, "led_halt")
- , m_led_hold(*this, "led_hold")
- , m_led_inte(*this, "led_inte")
- { }
-
- void mmd2(machine_config &config);
-
- void init_mmd2();
-
- DECLARE_INPUT_CHANGED_MEMBER(reset_button);
-
-protected:
- virtual void machine_start() override;
- virtual void machine_reset() override;
-
-private:
- DECLARE_WRITE8_MEMBER(port00_w);
- DECLARE_WRITE8_MEMBER(port01_w);
- DECLARE_WRITE8_MEMBER(port02_w);
- DECLARE_WRITE8_MEMBER(port05_w);
- DECLARE_READ8_MEMBER(port01_r);
- DECLARE_READ8_MEMBER(port13_r);
- DECLARE_READ8_MEMBER(bank_r);
- DECLARE_READ8_MEMBER(keyboard_r);
- DECLARE_WRITE8_MEMBER(scanlines_w);
- DECLARE_WRITE8_MEMBER(digit_w);
- DECLARE_WRITE8_MEMBER(status_callback);
- DECLARE_WRITE_LINE_MEMBER(inte_callback);
- DECLARE_READ_LINE_MEMBER(si);
- DECLARE_WRITE_LINE_MEMBER(so);
- void io_map(address_map &map);
- void mem_map(address_map &map);
- void reset_banks();
-
- uint8_t m_digit;
- required_device<i8080_cpu_device> m_maincpu;
- required_device<cassette_image_device> m_cass;
- required_memory_bank_array<8> m_banks;
- required_ioport_array<4> m_io_keyboard;
- required_ioport m_io_dsw;
- output_finder<9> m_digits;
- output_finder<3, 8> m_p;
- output_finder<> m_led_halt;
- output_finder<> m_led_hold;
- output_finder<> m_led_inte;
-};
-
-
-WRITE8_MEMBER( mmd2_state::port00_w )
-{
- m_p[0][7] = BIT(data,7) ? 0 : 1;
- m_p[0][6] = BIT(data,6) ? 0 : 1;
- m_p[0][5] = BIT(data,5) ? 0 : 1;
- m_p[0][4] = BIT(data,4) ? 0 : 1;
- m_p[0][3] = BIT(data,3) ? 0 : 1;
- m_p[0][2] = BIT(data,2) ? 0 : 1;
- m_p[0][1] = BIT(data,1) ? 0 : 1;
- m_p[0][0] = BIT(data,0) ? 0 : 1;
-}
-
-WRITE8_MEMBER( mmd2_state::port01_w )
-{
- m_p[1][7] = BIT(data,7) ? 0 : 1;
- m_p[1][6] = BIT(data,6) ? 0 : 1;
- m_p[1][5] = BIT(data,5) ? 0 : 1;
- m_p[1][4] = BIT(data,4) ? 0 : 1;
- m_p[1][3] = BIT(data,3) ? 0 : 1;
- m_p[1][2] = BIT(data,2) ? 0 : 1;
- m_p[1][1] = BIT(data,1) ? 0 : 1;
- m_p[1][0] = BIT(data,0) ? 0 : 1;
-}
-
-WRITE8_MEMBER( mmd2_state::port02_w )
-{
- m_p[2][7] = BIT(data,7) ? 0 : 1;
- m_p[2][6] = BIT(data,6) ? 0 : 1;
- m_p[2][5] = BIT(data,5) ? 0 : 1;
- m_p[2][4] = BIT(data,4) ? 0 : 1;
- m_p[2][3] = BIT(data,3) ? 0 : 1;
- m_p[2][2] = BIT(data,2) ? 0 : 1;
- m_p[2][1] = BIT(data,1) ? 0 : 1;
- m_p[2][0] = BIT(data,0) ? 0 : 1;
-}
-
-void mmd2_state::mem_map(address_map &map)
-{
- map.unmap_value_high();
- map(0x0000, 0x03ff).bankr("bank1").bankw("bank2");
- map(0x0400, 0x0fff).bankr("bank3").bankw("bank4");
- map(0xd800, 0xe3ff).bankr("bank5").bankw("bank6");
- map(0xe400, 0xe7ff).bankr("bank7").bankw("bank8");
- map(0xfc00, 0xfcff).ram(); // Scratchpad
-}
-
-void mmd2_state::io_map(address_map &map)
-{
- map.unmap_value_high();
- map(0x00, 0x00).w(FUNC(mmd2_state::port00_w));
- map(0x01, 0x01).rw(FUNC(mmd2_state::port01_r), FUNC(mmd2_state::port01_w));
- map(0x02, 0x02).w(FUNC(mmd2_state::port02_w));
- map(0x03, 0x03).rw("i8279", FUNC(i8279_device::status_r), FUNC(i8279_device::cmd_w));
- map(0x04, 0x04).rw("i8279", FUNC(i8279_device::data_r), FUNC(i8279_device::data_w));
- map(0x05, 0x07).r(FUNC(mmd2_state::bank_r));
- map(0x05, 0x05).w(FUNC(mmd2_state::port05_w));
- //map(0x09, 0x09).w PUP signal
- //map(0x0a, 0x0a).w Eprom programmer
-}
-
-
-/* Input ports */
-static INPUT_PORTS_START( mmd2 )
- PORT_START("DSW")
- PORT_DIPNAME( 0x20, 0x00, "Sw6") PORT_DIPLOCATION("SW1:1")
- PORT_DIPSETTING( 0x20, "Hex")
- PORT_DIPSETTING( 0x00, "Octal")
- PORT_DIPNAME( 0x10, 0x10, "Sw7") PORT_DIPLOCATION("SW1:2")
- PORT_DIPSETTING( 0x10, "PUP")
- PORT_DIPSETTING( 0x00, "Reset")
- PORT_DIPNAME( 0x08, 0x08, "Sw8") PORT_DIPLOCATION("SW1:3")
- PORT_DIPSETTING( 0x08, "Exec")
- PORT_DIPSETTING( 0x00, "User")
-
- PORT_START("X0")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CANCEL") PORT_CODE(KEYCODE_X)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("AUX") PORT_CODE(KEYCODE_W)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("REGS") PORT_CODE(KEYCODE_R)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("MEM") PORT_CODE(KEYCODE_MINUS)
- PORT_START("X1")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("COPY") PORT_CODE(KEYCODE_Y)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PROM") PORT_CODE(KEYCODE_U)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("DUMP") PORT_CODE(KEYCODE_I)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LOAD") PORT_CODE(KEYCODE_O)
- PORT_START("X2")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("OPTION") PORT_CODE(KEYCODE_S)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("GO") PORT_CODE(KEYCODE_G)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LOW") PORT_CODE(KEYCODE_L)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("HIGH") PORT_CODE(KEYCODE_H)
- PORT_START("X3")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("STEP") PORT_CODE(KEYCODE_Z)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("NEXT") PORT_CODE(KEYCODE_UP)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("STORE") PORT_CODE(KEYCODE_ENTER)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PREV") PORT_CODE(KEYCODE_DOWN)
- PORT_START("RESET")
- PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RESET") PORT_CODE(KEYCODE_LALT) PORT_CHANGED_MEMBER(DEVICE_SELF, mmd2_state, reset_button, 0)
-INPUT_PORTS_END
-
-INPUT_CHANGED_MEMBER(mmd2_state::reset_button)
-{
- if (newval)
- reset_banks();
- m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
-}
-
-/*
-Keyboard
-0 1 2 3 PREV STORE NEXT STEP
-4 5 6 7 HIGH LOW GO OPTION
-8 9 A B LOAD DUMP PROM COPY
-C D E F MEM REGS AUX CANCEL
-
-*/
-
-READ8_MEMBER( mmd2_state::bank_r )
-{
- for (auto &bank : m_banks)
- bank->set_entry(offset);
- return space.unmap();
-}
-
-READ8_MEMBER( mmd2_state::port01_r )
-{
- // need to add ttyin bit 0
- uint8_t data = 0x84;
- data |= m_io_dsw->read();
- data |= (m_cass->input() < 0.02) ? 0 : 2;
- return data;
-}
-
-WRITE8_MEMBER( mmd2_state::port05_w )
-{
- // need to add ttyout bit 0
- m_cass->output(BIT(data, 1) ? -1.0 : +1.0);
-}
-
-WRITE8_MEMBER( mmd2_state::scanlines_w )
-{
- m_digit = data;
-}
-
-WRITE8_MEMBER( mmd2_state::digit_w )
-{
- if (m_digit < 9)
- m_digits[m_digit] = data;
-}
-
-READ8_MEMBER( mmd2_state::keyboard_r )
-{
- uint8_t data = 0xff;
-
- if (m_digit < 4)
- data = m_io_keyboard[m_digit]->read();
-
- return data;
-}
-
-WRITE8_MEMBER( mmd2_state::status_callback )
-{
- // operate the HALT LED
- m_led_halt = ~data & i8080_cpu_device::STATUS_HLTA;
- // operate the HOLD LED - this should connect to the HLDA pin,
- // but it isn't emulated, using WO instead (whatever that does).
- m_led_hold = data & i8080_cpu_device::STATUS_WO;
-}
-
-WRITE_LINE_MEMBER( mmd2_state::inte_callback )
-{
- // operate the INTE LED
- m_led_inte = state;
-}
-
-void mmd2_state::machine_start()
-{
- m_digits.resolve();
- m_p.resolve();
- m_led_halt.resolve();
- m_led_hold.resolve();
- m_led_inte.resolve();
-}
-
-void mmd2_state::machine_reset()
-{
- reset_banks();
-}
-
-void mmd2_state::reset_banks()
-{
- for (auto &bank : m_banks)
- bank->set_entry(0);
-}
-
-void mmd2_state::init_mmd2()
-{
- // We preset all banks here, so that bankswitching will incur no speed penalty.
- // 0000/0400 indicate ROMs, D800/DC00/E400 indicate RAM, 8000 is a dummy write area for ROM banks.
- uint8_t *const p_ram = memregion("maincpu")->base();
- m_banks[0]->configure_entry(0, &p_ram[0x0000]);
- m_banks[0]->configure_entry(1, &p_ram[0xd800]);
- m_banks[0]->configure_entry(2, &p_ram[0x0c00]);
- m_banks[1]->configure_entry(0, &p_ram[0x8000]);
- m_banks[1]->configure_entry(1, &p_ram[0xd800]);
- m_banks[1]->configure_entry(2, &p_ram[0x8000]);
- m_banks[2]->configure_entry(0, &p_ram[0x0400]);
- m_banks[2]->configure_entry(1, &p_ram[0xdc00]);
- m_banks[2]->configure_entry(2, &p_ram[0xdc00]);
- m_banks[3]->configure_entry(0, &p_ram[0x8000]);
- m_banks[3]->configure_entry(1, &p_ram[0xdc00]);
- m_banks[3]->configure_entry(2, &p_ram[0xdc00]);
- m_banks[4]->configure_entry(0, &p_ram[0xd800]);
- m_banks[4]->configure_entry(1, &p_ram[0x0000]);
- m_banks[4]->configure_entry(2, &p_ram[0x0000]);
- m_banks[5]->configure_entry(0, &p_ram[0xd800]);
- m_banks[5]->configure_entry(1, &p_ram[0x8000]);
- m_banks[5]->configure_entry(2, &p_ram[0x8000]);
- m_banks[6]->configure_entry(0, &p_ram[0xe400]);
- m_banks[6]->configure_entry(1, &p_ram[0x0c00]);
- m_banks[6]->configure_entry(2, &p_ram[0xd800]);
- m_banks[7]->configure_entry(0, &p_ram[0xe400]);
- m_banks[7]->configure_entry(1, &p_ram[0x8000]);
- m_banks[7]->configure_entry(2, &p_ram[0xd800]);
-}
-
-void mmd2_state::mmd2(machine_config &config)
-{
- /* basic machine hardware */
- I8080(config, m_maincpu, 6750000 / 9);
- m_maincpu->set_addrmap(AS_PROGRAM, &mmd2_state::mem_map);
- m_maincpu->set_addrmap(AS_IO, &mmd2_state::io_map);
- m_maincpu->out_status_func().set(FUNC(mmd2_state::status_callback));
- m_maincpu->out_inte_func().set(FUNC(mmd2_state::inte_callback));
-
- /* video hardware */
- config.set_default_layout(layout_mmd2);
-
- /* Devices */
- i8279_device &kbdc(I8279(config, "i8279", 400000)); // based on divider
- kbdc.out_sl_callback().set(FUNC(mmd2_state::scanlines_w)); // scan SL lines
- kbdc.out_disp_callback().set(FUNC(mmd2_state::digit_w)); // display A&B
- kbdc.in_rl_callback().set(FUNC(mmd2_state::keyboard_r)); // kbd RL lines
- kbdc.in_shift_callback().set_constant(1); // Shift key
- kbdc.in_ctrl_callback().set_constant(1);
-
- // Cassette
- CASSETTE(config, m_cass);
- m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_SPEAKER_ENABLED | CASSETTE_MOTOR_ENABLED);
- SPEAKER(config, "mono").front_center();
- m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
-}
-
-/* ROM definition */
-ROM_START( mmd2 )
- ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
- ROM_LOAD( "mmd2330.bin", 0x0000, 0x0800, CRC(69a77199) SHA1(6c83093b2c32a558c969f4fe8474b234023cc348))
- ROM_LOAD( "mmd2340.bin", 0x0800, 0x0800, CRC(70681bd6) SHA1(c37e3cf34a75e8538471030bb49b8aed45d00ec3))
- ROM_LOAD( "mmd2350.bin", 0x1000, 0x0800, CRC(359f577c) SHA1(9405ca0c1977721e4540a4017907c06dab08d398))
- ROM_LOAD( "mmd2360.bin", 0x1800, 0x0800, CRC(967e69b8) SHA1(c21ec8bef955806a2c6e1b1c8e9068662fb88038))
-ROM_END
-
-/* Driver */
-
-// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
-COMP( 1976, mmd2, mmd1, 0, mmd2, mmd2, mmd2_state, init_mmd2, "E&L Instruments Inc", "MMD-2", MACHINE_NO_SOUND_HW )