// 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_io_keyboard(*this, "X%u", 0) , m_digits(*this, "digit%u", 0U) { } void mmd2(machine_config &config); void init_mmd2(); DECLARE_INPUT_CHANGED_MEMBER(reset_button); 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); virtual void machine_reset() override; void reset_banks(); uint8_t m_digit; virtual void machine_start() override { m_digits.resolve(); } required_device m_maincpu; required_device m_cass; required_ioport_array<4> m_io_keyboard; output_finder<9> m_digits; }; WRITE8_MEMBER( mmd2_state::port00_w ) { output().set_value("p0_7", BIT(data,7) ? 0 : 1); output().set_value("p0_6", BIT(data,6) ? 0 : 1); output().set_value("p0_5", BIT(data,5) ? 0 : 1); output().set_value("p0_4", BIT(data,4) ? 0 : 1); output().set_value("p0_3", BIT(data,3) ? 0 : 1); output().set_value("p0_2", BIT(data,2) ? 0 : 1); output().set_value("p0_1", BIT(data,1) ? 0 : 1); output().set_value("p0_0", BIT(data,0) ? 0 : 1); } WRITE8_MEMBER( mmd2_state::port01_w ) { output().set_value("p1_7", BIT(data,7) ? 0 : 1); output().set_value("p1_6", BIT(data,6) ? 0 : 1); output().set_value("p1_5", BIT(data,5) ? 0 : 1); output().set_value("p1_4", BIT(data,4) ? 0 : 1); output().set_value("p1_3", BIT(data,3) ? 0 : 1); output().set_value("p1_2", BIT(data,2) ? 0 : 1); output().set_value("p1_1", BIT(data,1) ? 0 : 1); output().set_value("p1_0", BIT(data,0) ? 0 : 1); } WRITE8_MEMBER( mmd2_state::port02_w ) { output().set_value("p2_7", BIT(data,7) ? 0 : 1); output().set_value("p2_6", BIT(data,6) ? 0 : 1); output().set_value("p2_5", BIT(data,5) ? 0 : 1); output().set_value("p2_4", BIT(data,4) ? 0 : 1); output().set_value("p2_3", BIT(data,3) ? 0 : 1); output().set_value("p2_2", BIT(data,2) ? 0 : 1); output().set_value("p2_1", BIT(data,1) ? 0 : 1); output().set_value("p2_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 ) { membank("bank1")->set_entry(offset); membank("bank2")->set_entry(offset); membank("bank3")->set_entry(offset); membank("bank4")->set_entry(offset); membank("bank5")->set_entry(offset); membank("bank6")->set_entry(offset); membank("bank7")->set_entry(offset); membank("bank8")->set_entry(offset); return 0xff; } READ8_MEMBER( mmd2_state::port01_r ) { // need to add ttyin bit 0 uint8_t data = 0x84; data |= ioport("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 output().set_value("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). output().set_value("led_hold", data & i8080_cpu_device::STATUS_WO); } WRITE_LINE_MEMBER( mmd2_state::inte_callback ) { // operate the INTE LED output().set_value("led_inte", state); } void mmd2_state::machine_reset() { reset_banks(); } void mmd2_state::reset_banks() { membank("bank1")->set_entry(0); membank("bank2")->set_entry(0); membank("bank3")->set_entry(0); membank("bank4")->set_entry(0); membank("bank5")->set_entry(0); membank("bank6")->set_entry(0); membank("bank7")->set_entry(0); membank("bank8")->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 *p_ram = memregion("maincpu")->base(); membank("bank1")->configure_entry(0, &p_ram[0x0000]); membank("bank1")->configure_entry(1, &p_ram[0xd800]); membank("bank1")->configure_entry(2, &p_ram[0x0c00]); membank("bank2")->configure_entry(0, &p_ram[0x8000]); membank("bank2")->configure_entry(1, &p_ram[0xd800]); membank("bank2")->configure_entry(2, &p_ram[0x8000]); membank("bank3")->configure_entry(0, &p_ram[0x0400]); membank("bank3")->configure_entry(1, &p_ram[0xdc00]); membank("bank3")->configure_entry(2, &p_ram[0xdc00]); membank("bank4")->configure_entry(0, &p_ram[0x8000]); membank("bank4")->configure_entry(1, &p_ram[0xdc00]); membank("bank4")->configure_entry(2, &p_ram[0xdc00]); membank("bank5")->configure_entry(0, &p_ram[0xd800]); membank("bank5")->configure_entry(1, &p_ram[0x0000]); membank("bank5")->configure_entry(2, &p_ram[0x0000]); membank("bank6")->configure_entry(0, &p_ram[0xd800]); membank("bank6")->configure_entry(1, &p_ram[0x8000]); membank("bank6")->configure_entry(2, &p_ram[0x8000]); membank("bank7")->configure_entry(0, &p_ram[0xe400]); membank("bank7")->configure_entry(1, &p_ram[0x0c00]); membank("bank7")->configure_entry(2, &p_ram[0xd800]); membank("bank8")->configure_entry(0, &p_ram[0xe400]); membank("bank8")->configure_entry(1, &p_ram[0x8000]); membank("bank8")->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 )