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-// license:BSD-3-Clause
-// copyright-holders:Miodrag Milanovic, Robbbert
-/***************************************************************************
-
-MMD-1 driver by Miodrag Milanovic
-
-2009-05-12 Initial version
-
-
- It appears that you enter an 3 digit octal number and then hit a function key.
- H - puts the number in the H register
- L - puts the number in the L register
- S - puts the number into memory pointed to by HL and then increments HL.
- G - Loads the program counter with the contents of HL
-
-1) There is a 'working byte' which you can enter using the octal digits
-(just press them in order), and which is displayed on the port 2 LEDs
-when KEX is running.
-
-2) 'R' is a hardware reset
-
-3) 'H' and 'L' are used to load the address (high and low parts, and it
-really is the HL register of the 8080). So to enter a particular address,
-you type in the high half (in octal), press H. Then type in the low half
-and press L. The address is displayed on the port 0 and port 1 LEDs when
-KEX is running.
-
-4) 'S' is 'Step' or 'Store'. It stores the working byte at the current
-address (in HL), and then increments the address. It's used to enter
-bytes into memory
-
-5) 'G' is 'go'. It loads the 8080 PC with the address in HL, and thus
-executes a program at that address.
-
-OK, this is what I would try.
-
-1) Press 'R' to reset the 8080 and start KEX running.
-
-2) Type 004 H 000 L to load the start address of your program. The bytes
-should appear on the rightmost 8 LEDs as you enter them and should then
-also appear on the left and middle sets of LEDs when you press H and L.
-
-3) Enter the program
-
-076 S 123 S 323 S 000 S 166S
-
-As you type each byte it should appear on the rightmost LEDs. When you
-press S, the address on the rest of the LEDs should increment by 1.
-
-4) Re-enter the start address
-004 H 000 L
-
-5) Press G to run the program. The left most LEDs should change to
-.*.*..** (. = off, * = on), I think. The keys will then do nothing (as
-the CPU is halted) until you press R again to re-run KEX.
-
-
-Cassette:
-- The only info available is that an unknown UART is used on ports 12/13.
-- Since MMD2 uses Kansas City format, I've used it here too. As there are
- no setup bytes, the UART is assumed to be the AY-3-1015 or equivalent.
- The result works perfectly.
-- To save: 001H 025L G (start recording) press 0-7 to indicate number of
- blocks to save (0 = 8 blocks). The start address is always 1800.
- When it's finished, control will return.
-- To load: 001H 000L (start playing), press G. When it's finished (cassette
- sound stops), press R. It always loads to 1800-up.
-
-ToDo:
-- tty uart ports 0x10/11, and rs232 interface
-- Need software
-
-****************************************************************************/
-
-#include "emu.h"
-#include "cpu/i8085/i8085.h"
-#include "imagedev/cassette.h"
-#include "machine/ay31015.h"
-#include "machine/clock.h"
-#include "machine/timer.h"
-#include "speaker.h"
-#include "mmd1.lh"
-
-
-class mmd1_state : public driver_device
-{
-public:
- mmd1_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_uart(*this, "uart")
- , m_digits(*this, "digit%u", 0U)
- , m_p(*this, "p%u_%u", 0U, 0U)
- { }
-
- void mmd1(machine_config &config);
-
- 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_READ8_MEMBER(keyboard_r);
- DECLARE_READ8_MEMBER(port13_r);
- DECLARE_READ_LINE_MEMBER(si);
- DECLARE_WRITE_LINE_MEMBER(so);
- TIMER_DEVICE_CALLBACK_MEMBER(kansas_r);
- DECLARE_WRITE_LINE_MEMBER(kansas_w);
-
- void io_map(address_map &map);
- void mem_map(address_map &map);
-
- u8 m_cass_data[4];
- bool m_cassinbit, m_cassoutbit, m_cassold;
- uint8_t m_return_code;
-
- required_device<i8080_cpu_device> m_maincpu;
- required_device<cassette_image_device> m_cass;
- required_device<ay31015_device> m_uart;
- output_finder<9> m_digits;
- output_finder<3, 8> m_p;
-};
-
-
-WRITE8_MEMBER( mmd1_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( mmd1_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( mmd1_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;
-}
-
-// keyboard has a keydown and a keyup code. Keyup = last keydown + bit 7 set
-READ8_MEMBER( mmd1_state::keyboard_r )
-{
- uint8_t line1 = ioport("LINE1")->read();
- uint8_t line2 = ioport("LINE2")->read();
- uint8_t i, data = 0xff;
-
-
- for (i = 0; i < 8; i++)
- {
- if (!BIT(line1, i))
- data = i;
- }
-
- for (i = 0; i < 8; i++)
- {
- if (!BIT(line2, i))
- data = i+8;
- }
-
- if (data < 0x10)
- {
- m_return_code = data | 0x80;
- return data;
- }
- else
- return m_return_code;
-}
-
-READ8_MEMBER(mmd1_state::port13_r)
-{
- u8 data = 0xfa;
- data |= m_uart->dav_r() ? 1 : 0;
- data |= m_uart->tbmt_r() ? 4 : 0;
- return data;
-}
-
-READ_LINE_MEMBER( mmd1_state::si )
-{
- return m_cassinbit;
-}
-
-WRITE_LINE_MEMBER( mmd1_state::so )
-{
- m_cassoutbit = state;
-}
-
-WRITE_LINE_MEMBER( mmd1_state::kansas_w )
-{
- if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) == CASSETTE_RECORD)
- {
- // incoming @4800Hz
- u8 twobit = m_cass_data[3] & 15;
-
- if (state)
- {
- if (twobit == 0)
- m_cassold = m_cassoutbit;
-
- if (m_cassold)
- 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
-
- m_cass_data[3]++;
- }
- }
-
- m_uart->write_tcp(state);
- m_uart->write_rcp(state);
-}
-
-TIMER_DEVICE_CALLBACK_MEMBER( mmd1_state::kansas_r )
-{
- // no tape - set to idle
- m_cass_data[1]++;
- if (m_cass_data[1] > 48)
- {
- m_cass_data[1] = 48;
- m_cassinbit = 1;
- }
-
- if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_PLAY)
- return;
-
- /* cassette - turn 1200/2400Hz to a bit */
- uint8_t cass_ws = (m_cass->input() > +0.04) ? 1 : 0;
-
- if (cass_ws != m_cass_data[0])
- {
- m_cass_data[0] = cass_ws;
- m_cassinbit = (m_cass_data[1] < 12) ? 1 : 0;
- m_cass_data[1] = 0;
- }
-}
-
-void mmd1_state::mem_map(address_map &map)
-{
- map.unmap_value_high();
- map(0x0000, 0x00ff).rom(); // Main ROM
- map(0x0100, 0x01ff).rom(); // Expansion slot
- map(0x0200, 0x02ff).ram();
- map(0x0300, 0x03ff).ram();
- map(0x1800, 0x1fff).ram(); // Area that can be accessed by cassette
-}
-
-void mmd1_state::io_map(address_map &map)
-{
- map.unmap_value_high();
- map(0x00, 0x00).rw(FUNC(mmd1_state::keyboard_r), FUNC(mmd1_state::port00_w));
- map(0x01, 0x01).w(FUNC(mmd1_state::port01_w));
- map(0x02, 0x02).w(FUNC(mmd1_state::port02_w));
- //map(0x10, 0x11).rw TTY UART
- map(0x12, 0x12).rw(m_uart, FUNC(ay51013_device::receive), FUNC(ay51013_device::transmit));
- map(0x13, 0x13).r(FUNC(mmd1_state::port13_r));
-}
-
-
-/* Input ports */
-static INPUT_PORTS_START( mmd1 )
- PORT_START("LINE1")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
-
- PORT_START("LINE2")
- PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S)
- PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
- PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C)
- PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G)
- PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H)
- PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L)
- PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A)
- PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B)
-
- PORT_START("LINE3")
- PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CODE(KEYCODE_LALT) PORT_CHANGED_MEMBER(DEVICE_SELF, mmd1_state, reset_button, 0)
-INPUT_PORTS_END
-
-INPUT_CHANGED_MEMBER(mmd1_state::reset_button)
-{
- m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
-}
-
-void mmd1_state::machine_start()
-{
- m_digits.resolve();
- m_p.resolve();
-}
-
-void mmd1_state::machine_reset()
-{
- m_return_code = 0xff;
- // setup uart to 8N2
- m_uart->write_np(1);
- m_uart->write_tsb(1);
- m_uart->write_nb1(1);
- m_uart->write_nb2(1);
- m_uart->write_eps(1);
- m_uart->write_cs(1);
- m_uart->write_cs(0);
-}
-
-void mmd1_state::mmd1(machine_config &config)
-{
- /* basic machine hardware */
- I8080(config, m_maincpu, 6750000 / 9);
- m_maincpu->set_addrmap(AS_PROGRAM, &mmd1_state::mem_map);
- m_maincpu->set_addrmap(AS_IO, &mmd1_state::io_map);
-
- /* video hardware */
- config.set_default_layout(layout_mmd1);
-
- AY51013(config, m_uart);
- m_uart->read_si_callback().set(FUNC(mmd1_state::si));
- m_uart->write_so_callback().set(FUNC(mmd1_state::so));
- m_uart->set_auto_rdav(true);
-
- clock_device &uart_clock(CLOCK(config, "uart_clock", 4800));
- uart_clock.signal_handler().set(FUNC(mmd1_state::kansas_w));
- TIMER(config, "kansas_r").configure_periodic(FUNC(mmd1_state::kansas_r), attotime::from_hz(40000));
-
- // cassette is connected to the uart
- 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( mmd1 )
- ROM_REGION( 0x0200, "maincpu", ROMREGION_ERASEFF )
- ROM_LOAD( "kex.ic15", 0x0000, 0x0100, CRC(434f6923) SHA1(a2af60deda54c8d3f175b894b47ff554eb37e9cb))
- ROM_LOAD( "prom1.ic16", 0x0100, 0x0100, BAD_DUMP CRC(d23a6ac3) SHA1(469d981b635058dd23e843a3efc555316f87ece4) ) // Typed in by hand from the manual
-ROM_END
-
-/* Driver */
-
-// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
-COMP( 1976, mmd1, 0, 0, mmd1, mmd1, mmd1_state, empty_init, "E&L Instruments Inc", "MMD-1", MACHINE_NO_SOUND_HW )