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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
P.R.E.S. Advanced Plus3/4
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/PRES_AP3A.html
TODO:
- add spare ROM slot in AP3 and AP4, not AP3/4
**********************************************************************/
#include "emu.h"
#include "ap34.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ELECTRON_AP34, electron_ap34_device, "electron_ap34", "P.R.E.S. Advanced Plus 3/4")
//-------------------------------------------------
// FLOPPY_FORMATS( ap34 )
//-------------------------------------------------
void electron_ap34_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_ACORN_ADFS_OLD_FORMAT);
}
void ap34_floppies(device_slot_interface &device)
{
device.option_add("35dd", FLOPPY_35_DD);
device.option_add("525qd", FLOPPY_525_QD);
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void electron_ap34_device::device_add_mconfig(machine_config &config)
{
/* fdc */
WD1770(config, m_fdc, DERIVED_CLOCK(1, 2));
FLOPPY_CONNECTOR(config, m_floppy[0], ap34_floppies, "525qd", electron_ap34_device::floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppy[1], ap34_floppies, nullptr, electron_ap34_device::floppy_formats).enable_sound(true);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// electron_ap34_device - constructor
//-------------------------------------------------
electron_ap34_device::electron_ap34_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, ELECTRON_AP34, tag, owner, clock)
, device_electron_cart_interface(mconfig, *this)
, m_fdc(*this, "fdc")
, m_floppy(*this, "fdc:%u", 0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void electron_ap34_device::device_start()
{
}
//-------------------------------------------------
// read - cartridge data read
//-------------------------------------------------
uint8_t electron_ap34_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2)
{
uint8_t data = 0xff;
if (infc)
{
switch (offset & 0xfc)
{
case 0xc4:
data = m_fdc->read(offset & 0x03);
break;
}
}
else if (oe)
{
if (m_ram.size() != 0 && romqa == 0 && offset >= 0x3000)
{
data = m_ram[offset & 0x0fff];
}
else
{
data = m_rom[(offset & 0x3fff) | (romqa << 14)];
}
}
return data;
}
//-------------------------------------------------
// write - cartridge data write
//-------------------------------------------------
void electron_ap34_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2)
{
if (infc)
{
switch (offset & 0xfc)
{
case 0xc0:
wd1770_control_w(data);
break;
case 0xc4:
m_fdc->write(offset & 0x03, data);
break;
}
}
else if (oe)
{
if (m_ram.size() != 0 && romqa == 0 && offset >= 0x3000)
{
m_ram[offset & 0x0fff] = data;
}
}
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
void electron_ap34_device::wd1770_control_w(uint8_t data)
{
floppy_image_device *floppy = nullptr;
// bit 0, 1: drive select
if (BIT(data, 0)) floppy = m_floppy[0]->get_device();
if (BIT(data, 1)) floppy = m_floppy[1]->get_device();
m_fdc->set_floppy(floppy);
// bit 2: side select
if (floppy)
floppy->ss_w(BIT(data, 2));
// bit 3: density
m_fdc->dden_w(BIT(data, 3));
// bit 4: NMI - not connected
//m_slot->nmi_w(!BIT(data, 4));
// bit 5: reset
m_fdc->mr_w(BIT(data, 5));
}
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