mirror of
https://github.com/holub/mame
synced 2025-06-06 12:53:46 +03:00
(MESS) Altos5: little more progress, now getting a bdos error.
This commit is contained in:
Robbbert
parent
2c03b5aebb
commit
702c80268d
@ -4,10 +4,9 @@
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Boots, terminal works, memory banking works.
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Error when reading floppy disk (record not found)
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Error when reading floppy disk (bdos error)
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ToDo:
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- DMA has its own memory banking, activated by BUSACK
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- Get floppy to read the disk (only ones found are .TD0 format)
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- Further work once the floppy is fixed
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@ -34,6 +33,7 @@ public:
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m_pio1(*this, "z80pio_1"),
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m_dart(*this, "z80dart"),
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m_sio (*this, "z80sio"),
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m_dma (*this, "z80dma"),
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m_ctc (*this, "z80ctc"),
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m_fdc (*this, "fdc"),
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m_floppy0(*this, "fdc:0"),
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@ -52,20 +52,24 @@ public:
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DECLARE_DRIVER_INIT(altos5);
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TIMER_DEVICE_CALLBACK_MEMBER(ctc_tick);
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DECLARE_WRITE_LINE_MEMBER(ctc_z1_w);
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DECLARE_WRITE_LINE_MEMBER(busreq_w);
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UINT8 m_port08;
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UINT8 m_port09;
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UINT8 *m_p_prom;
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bool m_ipl;
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offs_t m_curr_bank;
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floppy_image_device *m_floppy;
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void fdc_intrq_w(bool state);
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void fdc_drq_w(bool state);
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UINT8 convert(offs_t offset, bool state);
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void setup_banks();
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void setup_banks(UINT8 source);
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virtual void machine_reset();
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required_device<cpu_device> m_maincpu;
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required_device<z80pio_device> m_pio0;
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required_device<z80pio_device> m_pio1;
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required_device<z80dart_device> m_dart;
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required_device<z80sio0_device> m_sio;
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required_device<z80dma_device> m_dma;
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required_device<z80ctc_device> m_ctc;
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required_device<fd1797_t> m_fdc;
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required_device<floppy_connector> m_floppy0;
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@ -126,12 +130,19 @@ UINT8 altos5_state::convert(offs_t offset, bool state)
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return data & 0x3f;
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}
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void altos5_state::setup_banks()
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void altos5_state::setup_banks(UINT8 source)
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{
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// WPRT | template | cpu bank
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offs_t offs = ((~m_port09 & 0x20) << 3) | ((m_port09 & 0x06) << 5) | ((m_port09 & 0x18) << 1);
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offs_t temp = offs;
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offs_t offs,temp;
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// WPRT | template | dma bank / cpu bank
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if (source == 1) // use DMA banks only if BUSACK is asserted
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offs = ((~m_port09 & 0x20) << 3) | ((m_port09 & 0x06) << 5) | ((m_port09 & 0xc0) >> 2);
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else
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offs = ((~m_port09 & 0x20) << 3) | ((m_port09 & 0x06) << 5) | ((m_port09 & 0x18) << 1);
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temp = offs;
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if ((source == 2) || (temp != m_curr_bank))
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{
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membank("bankr0")->set_entry(convert(offs++, 0));
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membank("bankr1")->set_entry(convert(offs++, 0));
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membank("bankr2")->set_entry(convert(offs++, 0));
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@ -149,30 +160,35 @@ void altos5_state::setup_banks()
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membank("bankre")->set_entry(convert(offs++, 0));
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membank("bankrf")->set_entry(convert(offs++, 0));
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membank("bankw0")->set_entry(convert(temp++, 1));
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membank("bankw1")->set_entry(convert(temp++, 1));
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membank("bankw2")->set_entry(convert(temp++, 1));
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membank("bankw3")->set_entry(convert(temp++, 1));
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membank("bankw4")->set_entry(convert(temp++, 1));
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membank("bankw5")->set_entry(convert(temp++, 1));
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membank("bankw6")->set_entry(convert(temp++, 1));
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membank("bankw7")->set_entry(convert(temp++, 1));
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membank("bankw8")->set_entry(convert(temp++, 1));
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membank("bankw9")->set_entry(convert(temp++, 1));
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membank("bankwa")->set_entry(convert(temp++, 1));
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membank("bankwb")->set_entry(convert(temp++, 1));
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membank("bankwc")->set_entry(convert(temp++, 1));
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membank("bankwd")->set_entry(convert(temp++, 1));
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membank("bankwe")->set_entry(convert(temp++, 1));
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membank("bankwf")->set_entry(convert(temp++, 1));
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offs = temp;
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membank("bankw0")->set_entry(convert(offs++, 1));
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membank("bankw1")->set_entry(convert(offs++, 1));
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membank("bankw2")->set_entry(convert(offs++, 1));
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membank("bankw3")->set_entry(convert(offs++, 1));
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membank("bankw4")->set_entry(convert(offs++, 1));
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membank("bankw5")->set_entry(convert(offs++, 1));
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membank("bankw6")->set_entry(convert(offs++, 1));
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membank("bankw7")->set_entry(convert(offs++, 1));
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membank("bankw8")->set_entry(convert(offs++, 1));
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membank("bankw9")->set_entry(convert(offs++, 1));
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membank("bankwa")->set_entry(convert(offs++, 1));
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membank("bankwb")->set_entry(convert(offs++, 1));
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membank("bankwc")->set_entry(convert(offs++, 1));
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membank("bankwd")->set_entry(convert(offs++, 1));
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membank("bankwe")->set_entry(convert(offs++, 1));
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membank("bankwf")->set_entry(convert(offs++, 1));
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}
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m_curr_bank = temp;
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}
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void altos5_state::machine_reset()
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{
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m_curr_bank = 0;
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m_port08 = 0;
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m_port09 = 0;
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m_ipl = 1;
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setup_banks();
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setup_banks(2);
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m_maincpu->reset();
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}
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@ -192,7 +208,7 @@ static const z80_daisy_config daisy_chain_intf[] =
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WRITE8_MEMBER( altos5_state::port14_w )
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{
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m_ipl = 0;
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setup_banks();
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setup_banks(2);
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}
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READ8_MEMBER(altos5_state::memory_read_byte)
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@ -219,11 +235,20 @@ WRITE8_MEMBER(altos5_state::io_write_byte)
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return prog_space.write_byte(offset, data);
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}
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WRITE_LINE_MEMBER( altos5_state::busreq_w )
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{
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// since our Z80 has no support for BUSACK, we assume it is granted immediately
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m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, state);
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m_maincpu->set_input_line(INPUT_LINE_HALT, state); // do we need this?
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m_dma->bai_w(state); // tell dma that bus has been granted
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setup_banks(state); // adjust banking for dma or cpu
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}
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static Z80DMA_INTERFACE( dma_intf )
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{
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DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_HALT), // actually BUSRQ
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DEVCB_DRIVER_LINE_MEMBER(altos5_state, busreq_w),
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DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_IRQ0),
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DEVCB_NULL,
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DEVCB_NULL, // BAO, not used
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DEVCB_DRIVER_MEMBER(altos5_state, memory_read_byte),
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DEVCB_DRIVER_MEMBER(altos5_state, memory_write_byte),
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DEVCB_DRIVER_MEMBER(altos5_state, io_read_byte),
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@ -280,7 +305,10 @@ d7: IRQ from FDC
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*/
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READ8_MEMBER( altos5_state::port08_r )
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{
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return m_port08 | 0x07;
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UINT8 data = m_port08 | 0x87;
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if (m_floppy)
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data |= ((UINT8)m_floppy->twosid_r() << 3); // get number of sides
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return data;
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}
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/*
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@ -298,22 +326,21 @@ d6: SS (H = side 2)
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*/
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WRITE8_MEMBER( altos5_state::port08_w )
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{
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m_port08 = data;
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m_port08 = data & 0x70;
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floppy_image_device *floppy = NULL;
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m_floppy = NULL;
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if (BIT(data, 5))
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floppy = m_floppy1->get_device();
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m_floppy = m_floppy1->get_device();
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else
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floppy = m_floppy0->get_device();
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m_floppy = m_floppy0->get_device();
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m_fdc->set_floppy(floppy);
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m_fdc->set_floppy(m_floppy);
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if (floppy)
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if (m_floppy)
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{
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floppy->mon_w(0);
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floppy->ss_w(BIT(data, 6));
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m_floppy->mon_w(0);
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m_floppy->ss_w(BIT(data, 6));
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m_fdc->dden_w(!BIT(data, 4));
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m_port08 |= ((UINT8)floppy->twosid_r() << 3); // get number of sides
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}
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}
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@ -326,7 +353,7 @@ d6, 7: DMA bank select (not emulated)
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WRITE8_MEMBER( altos5_state::port09_w )
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{
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m_port09 = data;
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setup_banks();
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setup_banks(2);
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}
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// parallel port
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@ -379,7 +406,7 @@ static Z80SIO_INTERFACE( sio_intf )
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DEVCB_NULL, // out data
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DEVCB_NULL, // DTR
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DEVCB_NULL, // RTS
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DEVCB_NULL, // WRDY
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DEVCB_NULL, // WRDY connects to (altos5_state, fdc_intrq_w),
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DEVCB_NULL, // SYNC
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// console#1
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@ -412,27 +439,26 @@ SLOT_INTERFACE_END
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void altos5_state::fdc_intrq_w(bool state)
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{
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m_port08 = (m_port08 & 0x7f) | ((UINT8)(state) << 7);
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m_pio0->port_a_write(m_port08);
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UINT8 data = m_port08 | ((UINT8)(state) << 7);
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m_pio0->port_a_write(data);
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}
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void altos5_state::fdc_drq_w(bool state)
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{
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// To DMA pin 25 - SDMA
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m_dma->rdy_w(state);
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}
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DRIVER_INIT_MEMBER( altos5_state, altos5 )
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{
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floppy_connector *con = machine().device<floppy_connector>("fdc:0");
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floppy_image_device *floppy = con ? con->get_device() : 0;
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if (floppy)
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{
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m_fdc->set_floppy(floppy);
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m_fdc->setup_intrq_cb(fd1797_t::line_cb(FUNC(altos5_state::fdc_intrq_w), this));
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m_fdc->setup_drq_cb(fd1797_t::line_cb(FUNC(altos5_state::fdc_drq_w), this));
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floppy->ss_w(0);
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floppy_connector *con = machine().device<floppy_connector>("fdc:0");
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m_floppy = con ? con->get_device() : 0;
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if (m_floppy)
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{
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m_fdc->set_floppy(m_floppy);
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m_floppy->ss_w(0);
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}
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