mirror of
https://github.com/holub/mame
synced 2025-07-08 11:21:56 +03:00
m3: Make the floppy work
This commit is contained in:
Dirk Best
parent
81a4d2953b
commit
ad39cbb565
@ -27,13 +27,15 @@
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TODO:
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- Initial PC is currently hacked to f000
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- Finish floppy hookup
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- Verify/fix floppy hookup (CPU needs to be overclocked?)
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- Printer interface
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- Buzzer
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- Map the rest of the keys, verify existing keys
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Notes:
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- No software available
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- No offical software available, but a custom version of CP/M
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- Y to boot from floppy, ESC to enter monitor, any other key to
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boot from IDE
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***************************************************************************/
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@ -64,6 +66,7 @@ public:
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m3_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_ctc(*this, "ctc"),
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m_ppi(*this, "ppi%u", 0U),
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m_chargen(*this, "chargen"),
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m_vram(*this, "vram"),
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@ -83,6 +86,7 @@ protected:
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private:
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required_device<z80_device> m_maincpu;
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required_device<z80ctc_device> m_ctc;
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required_device_array<i8255_device, 2> m_ppi;
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required_region_ptr<uint8_t> m_chargen;
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required_shared_ptr<uint8_t> m_vram;
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@ -112,6 +116,12 @@ private:
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uint8_t ppi2_pb_r();
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MC6845_UPDATE_ROW(crtc_update_row);
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void fdc_intrq_w(int state);
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void fdc_drq_w(int state);
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uint8_t fdc_data_r(offs_t offset);
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void fdc_data_w(offs_t offset, uint8_t data);
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bool m_nmi_taken;
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};
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@ -128,11 +138,15 @@ void m3_state::mem_map(address_map &map)
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void m3_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(0x80, 0x83).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
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map(0x80, 0x83).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
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map(0x84, 0x84).rw("crtc", FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
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map(0x85, 0x85).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
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map(0x88, 0x8b).rw(m_fdc, FUNC(fd1793_device::read), FUNC(fd1793_device::write));
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map(0x88, 0x88).rw(m_fdc, FUNC(fd1793_device::status_r), FUNC(fd1793_device::cmd_w));
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map(0x89, 0x89).rw(m_fdc, FUNC(fd1793_device::track_r), FUNC(fd1793_device::track_w));
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map(0x8a, 0x8a).rw(m_fdc, FUNC(fd1793_device::sector_r), FUNC(fd1793_device::sector_w));
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map(0x8b, 0x8b).rw(FUNC(m3_state::fdc_data_r), FUNC(m3_state::fdc_data_w));
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map(0x8c, 0x8d).rw("usart", FUNC(i8251_device::read), FUNC(i8251_device::write));
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map(0x90, 0x93).rw(m_ppi[0], FUNC(i8255_device::read), FUNC(i8255_device::write));
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map(0x94, 0x97).rw(m_ppi[1], FUNC(i8255_device::read), FUNC(i8255_device::write));
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@ -420,7 +434,7 @@ static const gfx_layout charlayout =
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};
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static GFXDECODE_START(chars)
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GFXDECODE_ENTRY("chargen", 0x0000, charlayout, 0, 1)
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GFXDECODE_ENTRY("chargen", 0, charlayout, 0, 1)
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GFXDECODE_END
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@ -428,6 +442,57 @@ GFXDECODE_END
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// MACHINE EMULATION
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//**************************************************************************
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void m3_state::fdc_intrq_w(int state)
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{
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if (state)
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{
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m_nmi_taken = false;
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m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
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}
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m_ctc->trg1(state);
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}
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void m3_state::fdc_drq_w(int state)
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{
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if (state)
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m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
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if (state && !m_nmi_taken)
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{
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m_nmi_taken = true;
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m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
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}
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}
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uint8_t m3_state::fdc_data_r(offs_t offset)
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{
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if ((m_fdc->drq_r() == 0) && m_nmi_taken)
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{
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// cpu tries to read data without drq, halt it and reset pc
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m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
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m_maincpu->set_state_int(Z80_PC, m_maincpu->state_int(Z80_PC) - 2);
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return 0;
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}
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return m_fdc->data_r();
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}
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void m3_state::fdc_data_w(offs_t offset, uint8_t data)
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{
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if ((m_fdc->drq_r() == 0) && m_nmi_taken)
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{
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// cpu tries to write data without drq, halt it and reset pc
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m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
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m_maincpu->set_state_int(Z80_PC, m_maincpu->state_int(Z80_PC) - 2);
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return;
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}
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m_fdc->data_w(data);
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}
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void m3_state::ppi2_pa_w(uint8_t data)
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{
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floppy_image_device *floppy = nullptr;
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@ -435,9 +500,9 @@ void m3_state::ppi2_pa_w(uint8_t data)
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// 7------- not used?
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// -6------ buzzer
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// --5----- not used?
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// ---4---- unknown
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// ---4---- unknown (motor?)
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// ----3--- unknown
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// -----2-- unknown (side?)
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// -----2-- floppy side
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// ------10 drive select
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logerror("ppi2_pa_w: %02x\n", data);
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@ -449,7 +514,8 @@ void m3_state::ppi2_pa_w(uint8_t data)
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m_fdc->set_floppy(floppy);
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// todo: side select, motor
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if (floppy)
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floppy->ss_w(BIT(data, 2));
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}
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uint8_t m3_state::ppi2_pb_r()
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@ -463,12 +529,15 @@ void m3_state::machine_start()
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save_item(NAME(m_kbd_col));
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save_item(NAME(m_kbd_row));
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save_item(NAME(m_kbd_data));
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save_item(NAME(m_nmi_taken));
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}
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void m3_state::machine_reset()
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{
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m_maincpu->set_pc(0xf000);
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m_nmi_taken = false;
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// floppy motor is always on
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if (m_floppy[0])
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m_floppy[0]->get_device()->mon_w(0);
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@ -507,16 +576,16 @@ static void m3_floppies(device_slot_interface &device)
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void m3_state::m3(machine_config &config)
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{
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Z80(config, m_maincpu, 2'500'000); // unknown divisor
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Z80(config, m_maincpu, 3'000'000); // should be 2.5 MHz, but then it's too slow for the floppy
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m_maincpu->set_addrmap(AS_PROGRAM, &m3_state::mem_map);
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m_maincpu->set_addrmap(AS_IO, &m3_state::io_map);
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m_maincpu->set_daisy_config(daisy_chain);
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z80ctc_device& ctc(Z80CTC(config, "ctc", 0)); // unknown clock
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ctc.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
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ctc.set_clk<0>(2'457'600 / 2); // unknown clock. this gives the usart 9600 baud by default
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ctc.zc_callback<0>().set("usart", FUNC(i8251_device::write_txc));
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ctc.zc_callback<0>().append("usart", FUNC(i8251_device::write_rxc));
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Z80CTC(config, m_ctc, 0); // unknown clock
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m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
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m_ctc->set_clk<0>(2'457'600 / 2); // unknown clock. this gives the usart 9600 baud by default
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m_ctc->zc_callback<0>().set("usart", FUNC(i8251_device::write_txc));
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m_ctc->zc_callback<0>().append("usart", FUNC(i8251_device::write_rxc));
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I8255(config, m_ppi[0]);
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@ -549,11 +618,12 @@ void m3_state::m3(machine_config &config)
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crtc.set_show_border_area(false);
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crtc.set_char_width(7);
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crtc.set_update_row_callback(FUNC(m3_state::crtc_update_row));
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crtc.out_vsync_callback().set("ctc", FUNC(z80ctc_device::trg2));
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crtc.out_vsync_callback().set(m_ctc, FUNC(z80ctc_device::trg2));
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// floppy
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FD1793(config, m_fdc, 2'000'000); // unknown clock
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m_fdc->drq_wr_callback().set_inputline(m_maincpu, INPUT_LINE_NMI);
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m_fdc->intrq_wr_callback().set(FUNC(m3_state::fdc_intrq_w));
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m_fdc->drq_wr_callback().set(FUNC(m3_state::fdc_drq_w));
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FLOPPY_CONNECTOR(config, "fdc:0", m3_floppies, "sa850", floppy_image_device::default_floppy_formats);
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FLOPPY_CONNECTOR(config, "fdc:1", m3_floppies, "sa850", floppy_image_device::default_floppy_formats);
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@ -578,7 +648,7 @@ ROM_START( m3 )
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ROM_LOAD("bootstrap_prom_034.bin", 0x0000, 0x0800, CRC(7fdb051e) SHA1(7aa24d4f44b6a0c8f7f647667f4997432c186cac))
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// Homebrew Monitor ROM, written by Steve Hunt. Uses the socket of the HDD ROM.
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ROM_LOAD("monitor_prom_v17_2015-12-09.bin", 0x0800, 0x0800, CRC(85b5c541) SHA1(92b4ec87a4d0d8c0f7b49eec0c5457f237de0a01))
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ROM_LOAD("monitor_prom_v19_2017-07-05.bin", 0x0800, 0x0800, CRC(0608848f) SHA1(9a82cb49056ff1a1d53ce2bd026537a6914a4847))
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ROM_REGION(0x800, "chargen", 0)
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ROM_LOAD("6845crt_font_prom_033.bin", 0x000, 0x800, CRC(cc29f664) SHA1(4197530d9455d665fd4773f95bb6394f6b056dec))
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