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https://github.com/holub/mame
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mccpm: added fdc, bankdev, notes
This commit is contained in:
Robbbert
parent
5a17e121e3
commit
97ad4e1fb7
@ -2,27 +2,27 @@
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// copyright-holders:Miodrag Milanovic, Robbbert
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/***************************************************************************
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mc-CP/M-Computer
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mc-CP/M-Computer
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31/08/2010 Skeleton driver.
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18/11/2010 Connected to a terminal
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28/09/2011 Added more bioses
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2010-08-31 Skeleton driver.
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2010-11-18 Connected to a terminal
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2011-09-28 Added more bioses
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Some Monitor commands (varies between versions):
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B - boot a floppy (^N to regain control)
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B - lock keyboard (^N to regain control)
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E - prints a number
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I - Select boot drive/set parameters
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I - Select boot drive/set parameters - then it attempts to boot
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K,O - display version header
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N - newline
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Z - print 'EFFF'
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URL for v3.4: http://www.hanshehl.de/mc-prog.htm (German language)
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unknown I/O ports (my guess)
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30 - fdc (1st drive)
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40 - fdc (2nd drive)
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Although the manual specifies ports 40-44 for the FDC, all bios versions
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support it at 30-34 as well.
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No software to test with, so we'll never know if the FDC works.
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****************************************************************************/
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@ -31,7 +31,10 @@ unknown I/O ports (my guess)
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#include "machine/z80pio.h"
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#include "machine/z80sio.h"
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#include "machine/clock.h"
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#include "machine/bankdev.h"
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#include "machine/wd_fdc.h"
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#include "bus/rs232/rs232.h"
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#include "imagedev/floppy.h"
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class mccpm_state : public driver_device
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@ -40,7 +43,10 @@ public:
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mccpm_state(const machine_config &mconfig, device_type type, const char *tag)
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: driver_device(mconfig, type, tag)
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, m_maincpu(*this, "maincpu")
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, m_ram(*this, "mainram")
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, m_bank(*this, "bankdev_map")
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, m_fdc (*this, "fdc")
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, m_floppy0(*this, "fdc:0")
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, m_floppy1(*this, "fdc:1")
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{ }
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void mccpm(machine_config &config);
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@ -48,22 +54,43 @@ public:
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private:
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void io_map(address_map &map);
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void mem_map(address_map &map);
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virtual void machine_reset() override;
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void bankdev_map(address_map &map);
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void port44_w(u8);
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u8 port44_r();
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void fdc_irq(bool);
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u8 m_fdc_status;
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floppy_image_device *m_floppy;
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void machine_reset() override;
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void machine_start() override;
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required_device<cpu_device> m_maincpu;
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required_shared_ptr<u8> m_ram;
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required_device<address_map_bank_device> m_bank;
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required_device<fd1797_device> m_fdc;
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required_device<floppy_connector> m_floppy0;
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required_device<floppy_connector> m_floppy1;
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};
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void mccpm_state::bankdev_map(address_map &map)
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{
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// bank 0
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map(0x0000, 0x3fff).rom().region("maincpu", 0);
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map(0x4000, 0x7fff).lr8(NAME([this] () { if (!machine().side_effects_disabled()) m_bank->set_bank(1); return 0xff; }));
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// bank 1
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map(0x8000, 0xffff).ram();
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}
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void mccpm_state::mem_map(address_map &map)
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{
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map(0x0000, 0xffff).ram().share("mainram");
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map(0x0000, 0x7fff).m(m_bank, FUNC(address_map_bank_device::amap8));
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map(0x8000, 0xffff).ram();
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}
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void mccpm_state::io_map(address_map &map)
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{
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map.unmap_value_high();
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map.global_mask(0xff);
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map(0x40, 0x43).rw(m_fdc, FUNC(fd1797_device::read), FUNC(fd1797_device::write));
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map(0x44, 0x44).rw(FUNC(mccpm_state::port44_r), FUNC(mccpm_state::port44_w));
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map(0xf0, 0xf3).rw("sio", FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w));
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map(0xf4, 0xf7).rw("pio", FUNC(z80pio_device::read_alt), FUNC(z80pio_device::write_alt));
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}
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@ -72,11 +99,58 @@ void mccpm_state::io_map(address_map &map)
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static INPUT_PORTS_START( mccpm )
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INPUT_PORTS_END
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void mccpm_state::port44_w(u8 data)
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{
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m_floppy = nullptr;
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if (BIT(data, 1))
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m_floppy = m_floppy1->get_device();
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else
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if (BIT(data, 0))
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m_floppy = m_floppy0->get_device();
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m_fdc->set_floppy(m_floppy);
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if (m_floppy)
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{
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m_floppy->mon_w(0);
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m_fdc->dden_w(!BIT(data, 4)); // 0 = FM; 1 = MFM
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}
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// side select comes from fdc pin 25
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m_fdc->set_unscaled_clock(BIT(data, 5) ? 1e6 : 2e6); // 13 or 20cm clock select
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m_maincpu->set_input_line_vector(0, 0xD7 ); // Z80 - jump to 0x0010 upon interrupt acknowledge IM 0 (or should it say 0x10?)
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}
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u8 mccpm_state::port44_r()
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{
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// bit 4 is floppy hld_r, not yet emulated.
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// So we assume the head is loaded if the drive is selected.
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if (m_floppy)
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return m_fdc_status | 4;
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else
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return m_fdc_status;
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}
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void mccpm_state::fdc_irq(bool state)
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{
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m_fdc_status = (m_fdc_status & 0xfd) | (state ? 2 : 0);
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m_maincpu->set_input_line(0, state ? ASSERT_LINE : CLEAR_LINE);
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}
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void mccpm_state::machine_reset()
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{
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uint8_t* bios = memregion("maincpu")->base();
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memcpy(m_ram, bios, 0x1000);
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m_bank->set_bank(0);
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m_fdc_status = 0xfb;
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m_floppy = nullptr;
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}
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void mccpm_state::machine_start()
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{
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save_item(NAME(m_fdc_status));;
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}
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static void flop_types(device_slot_interface &device)
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{
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device.option_add("flop", FLOPPY_525_QD);
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}
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void mccpm_state::mccpm(machine_config &config)
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@ -86,11 +160,19 @@ void mccpm_state::mccpm(machine_config &config)
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m_maincpu->set_addrmap(AS_PROGRAM, &mccpm_state::mem_map);
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m_maincpu->set_addrmap(AS_IO, &mccpm_state::io_map);
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ADDRESS_MAP_BANK(config, m_bank, 0);
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m_bank->set_addrmap(0, &mccpm_state::bankdev_map);
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m_bank->set_data_width(8);
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m_bank->set_addr_width(16);
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m_bank->set_stride(0x8000);
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/* Devices */
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clock_device &uart_clock(CLOCK(config, "uart_clock", 153600));
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// clock supplied by pair of HD4702 baud rate generators
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clock_device &uart_clock(CLOCK(config, "uart_clock", 153'600));
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uart_clock.signal_handler().set("sio", FUNC(z80sio_device::txca_w));
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uart_clock.signal_handler().append("sio", FUNC(z80sio_device::rxca_w));
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// Ch A: terminal; Ch B: printer
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z80sio_device& sio(Z80SIO(config, "sio", XTAL(4'000'000)));
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sio.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
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sio.out_txda_callback().set("rs232", FUNC(rs232_port_device::write_txd));
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@ -102,11 +184,17 @@ void mccpm_state::mccpm(machine_config &config)
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rs232.cts_handler().set("sio", FUNC(z80sio_device::ctsa_w));
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Z80PIO(config, "pio", XTAL(4'000'000));
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FD1797(config, m_fdc, 8_MHz_XTAL / 8);
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m_fdc->intrq_wr_callback().set([this] (bool state) { mccpm_state::fdc_irq(state); });
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m_fdc->drq_wr_callback().set([this] (u8 state) { m_fdc_status = (m_fdc_status & 0xfe) | (state ? 1 : 0); });
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FLOPPY_CONNECTOR(config, "fdc:0", flop_types, "flop", floppy_image_device::default_floppy_formats).enable_sound(true);
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FLOPPY_CONNECTOR(config, "fdc:1", flop_types, "flop", floppy_image_device::default_floppy_formats).enable_sound(true);
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}
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/* ROM definition */
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ROM_START( mccpm )
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ROM_REGION( 0x1000, "maincpu", 0 )
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ROM_REGION( 0x4000, "maincpu", ROMREGION_ERASEFF )
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ROM_SYSTEM_BIOS(0, "v36", "V3.6")
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ROMX_LOAD("mon36.j15", 0x0000, 0x1000, CRC(9c441537) SHA1(f95bad52d9392b8fc9d9b8779b7b861672a0022b), ROM_BIOS(0))
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ROM_SYSTEM_BIOS(1, "v34", "V3.4")
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