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// license:BSD-3-Clause
// copyright-holders:Brian Johnson
/*******************************************************************
*
* NABU PC FDC Card
*
*******************************************************************/
#include "emu.h"
#include "fdc.h"
#include "imagedev/floppy.h"
#include "machine/wd_fdc.h"
#include "formats/nabupc_dsk.h"
//**************************************************************************
// NABU PC FDC DEVICE
//**************************************************************************
namespace {
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
/* NABU PC FDC Device */
class fdc_device : public device_t, public bus::nabupc::device_option_expansion_interface
{
public:
// construction/destruction
fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual uint8_t read(offs_t offset) override;
virtual void write(offs_t offset, uint8_t data) override;
protected:
// device-level overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
private:
void ds_w(uint8_t data);
static void floppy_formats(format_registration &fr);
required_device<wd2797_device> m_wd2797;
required_device_array<floppy_connector, 2> m_floppies;
};
static void nabu_fdc_drives(device_slot_interface &device)
{
device.option_add("525dd", FLOPPY_525_DD);
device.option_add("35dd", FLOPPY_35_DD);
}
//-------------------------------------------------
// fdc_device - constructor
//-------------------------------------------------
fdc_device::fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, NABUPC_OPTION_FDC, tag, owner, clock),
device_option_expansion_interface(mconfig, *this),
m_wd2797(*this, "fdc"),
m_floppies(*this, "fdc:%u", 0)
{
}
//-------------------------------------------------
// device_add_mconfig - device-specific config
//-------------------------------------------------
void fdc_device::device_add_mconfig(machine_config &config)
{
WD2797(config, m_wd2797, 4_MHz_XTAL / 4).set_force_ready(true);
FLOPPY_CONNECTOR(config, m_floppies[0], nabu_fdc_drives, "525dd", fdc_device::floppy_formats);
FLOPPY_CONNECTOR(config, m_floppies[1], nabu_fdc_drives, "525dd", fdc_device::floppy_formats);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void fdc_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void fdc_device::device_reset()
{
m_wd2797->set_floppy(nullptr);
m_wd2797->dden_w(0);
}
//-------------------------------------------------
// supported floppy formats
//-------------------------------------------------
void fdc_device::floppy_formats(format_registration &fr)
{
fr.add(FLOPPY_NABUPC_FORMAT);
}
//-------------------------------------------------
// ds_w - write to drive select/density register
//-------------------------------------------------
void fdc_device::ds_w(uint8_t data)
{
m_wd2797->dden_w(BIT(data, 0));
floppy_image_device *floppy = nullptr;
if (BIT(data, 1)) floppy = m_floppies[0]->get_device();
if (BIT(data, 2)) floppy = m_floppies[1]->get_device();
m_wd2797->set_floppy(floppy);
for (auto& fdd : m_floppies)
{
floppy_image_device *floppy = fdd->get_device();
if (floppy)
{
floppy->mon_w((data & 6) ? 0 : 1);
}
}
}
uint8_t fdc_device::read(offs_t offset)
{
uint8_t result;
switch(offset) {
case 0x00:
case 0x01:
case 0x02:
case 0x03:
result = m_wd2797->read(offset);
break;
case 0x0F:
result = 0x10;
break;
default:
result = 0xFF;
}
return result;
}
void fdc_device::write(offs_t offset, uint8_t data)
{
switch(offset) {
case 0x00:
case 0x01:
case 0x02:
case 0x03:
m_wd2797->write(offset, data);
break;
case 0x0F:
ds_w(data);
break;
}
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(NABUPC_OPTION_FDC, bus::nabupc::device_option_expansion_interface, fdc_device, "nabupc_option_fdc", "NABU PC Floppy Controller")
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