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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Computer Village 1797 FDC
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/ComputerVillage_FDC.html
Notes:
Everything seems to work, but schematic required to confirm implementation
of side and motor control.
**********************************************************************/
#include "emu.h"
#include "cv1797.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(BBC_CV1797, bbc_cv1797_device, "bbc_cv1797", "Computer Village 1797 FDC")
//-------------------------------------------------
// FLOPPY_FORMATS( floppy_formats )
//-------------------------------------------------
void bbc_cv1797_device::floppy_formats(format_registration &fr)
{
fr.add_mfm_containers();
fr.add(FLOPPY_ACORN_SSD_FORMAT);
fr.add(FLOPPY_ACORN_DSD_FORMAT);
fr.add(FLOPPY_FSD_FORMAT);
}
static void bbc_floppies_525(device_slot_interface &device)
{
device.option_add("525sssd", FLOPPY_525_SSSD);
device.option_add("525sd", FLOPPY_525_SD);
device.option_add("525ssdd", FLOPPY_525_SSDD);
device.option_add("525dd", FLOPPY_525_DD);
device.option_add("525qd", FLOPPY_525_QD);
}
//-------------------------------------------------
// ROM( cv1797 )
//-------------------------------------------------
ROM_START( cv1797 )
ROM_REGION(0x4000, "dfs_rom", 0)
ROM_DEFAULT_BIOS("lvldos")
ROM_SYSTEM_BIOS(0, "lvldos", "LVL Dos 0.91")
ROMX_LOAD("lvldos91.rom", 0x0000, 0x2000, CRC(69d7653a) SHA1(9cd39d011290b97d5ba05b6c745689a8553be5fc), ROM_BIOS(0))
ROM_RELOAD(0x2000, 0x2000)
ROM_END
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void bbc_cv1797_device::device_add_mconfig(machine_config &config)
{
FD1797(config, m_fdc, 8_MHz_XTAL / 8);
m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::drq_w));
m_fdc->sso_wr_callback().set(FUNC(bbc_cv1797_device::fdc_sso_w));
m_fdc->hld_wr_callback().set(FUNC(bbc_cv1797_device::fdc_hld_w));
FLOPPY_CONNECTOR(config, m_floppies[0], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppies[1], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
}
const tiny_rom_entry *bbc_cv1797_device::device_rom_region() const
{
return ROM_NAME( cv1797 );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_cv1797_device - constructor
//-------------------------------------------------
bbc_cv1797_device::bbc_cv1797_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, BBC_CV1797, tag, owner, clock)
, device_bbc_fdc_interface(mconfig, *this)
, m_fdc(*this, "fd1797")
, m_floppies(*this, "fd1797:%u", 0)
, m_floppy(nullptr)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_cv1797_device::device_start()
{
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t bbc_cv1797_device::read(offs_t offset)
{
uint8_t data;
if (offset & 0x04)
{
data = 0xfe;
}
else
{
data = m_fdc->read(offset & 0x03);
}
return data;
}
void bbc_cv1797_device::write(offs_t offset, uint8_t data)
{
if (offset & 0x04)
{
// bit 0: drive select
m_floppy = m_floppies[BIT(data, 0)]->get_device();
m_fdc->set_floppy(m_floppy);
// bit 1: side select
if (m_floppy)
m_floppy->ss_w(BIT(data, 1));
// bit 2: density
m_fdc->dden_w(!BIT(data, 2));
}
else
{
m_fdc->write(offset & 0x03, data);
}
}
WRITE_LINE_MEMBER(bbc_cv1797_device::fdc_sso_w)
{
// TODO: schematic required to confirm usage.
}
WRITE_LINE_MEMBER(bbc_cv1797_device::fdc_hld_w)
{
if (m_floppy)
m_floppy->mon_w(!state);
}
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