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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
ZX Interface 1
The ZX Interface 1 combines the three functions of microdrive
controller, local area network and RS232 interface.
**********************************************************************/
#include "emu.h"
#include "intf1.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(SPECTRUM_INTF1, spectrum_intf1_device, "spectrum_intf1", "ZX Interface 1")
//-------------------------------------------------
// MACHINE_DRIVER( intf1 )
//-------------------------------------------------
ROM_START( intf1 )
ROM_REGION( 0x2000, "rom", 0 )
ROM_DEFAULT_BIOS("v2")
ROM_SYSTEM_BIOS(0, "v1", "v1")
ROMX_LOAD("if1-1.rom", 0x0000, 0x2000, CRC(e72a12ae) SHA1(4ffd9ed9c00cdc6f92ce69fdd8b618ef1203f48e), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "v2", "v2")
ROMX_LOAD("if1-2.rom", 0x0000, 0x2000, CRC(bb66dd1e) SHA1(5cfb6bca4177c45fefd571734576b55e3a127c08), ROM_BIOS(1))
ROM_END
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void spectrum_intf1_device::device_add_mconfig(machine_config &config)
{
/* rs232 */
RS232_PORT(config, m_rs232, default_rs232_devices, nullptr);
/* microdrive */
MICRODRIVE(config, m_mdv1, 0);
m_mdv1->comms_out_wr_callback().set(m_mdv2, FUNC(microdrive_image_device::comms_in_w));
MICRODRIVE(config, m_mdv2, 0);
/* passthru */
SPECTRUM_EXPANSION_SLOT(config, m_exp, spectrum_expansion_devices, nullptr);
m_exp->irq_handler().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::irq_w));
m_exp->nmi_handler().set(DEVICE_SELF_OWNER, FUNC(spectrum_expansion_slot_device::nmi_w));
}
const tiny_rom_entry *spectrum_intf1_device::device_rom_region() const
{
return ROM_NAME( intf1 );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// spectrum_intf1_device - constructor
//-------------------------------------------------
spectrum_intf1_device::spectrum_intf1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, SPECTRUM_INTF1, tag, owner, clock)
, device_spectrum_expansion_interface(mconfig, *this)
, m_exp(*this, "exp")
, m_rs232(*this, "rs232")
, m_mdv1(*this, "mdv1")
, m_mdv2(*this, "mdv2")
, m_rom(*this, "rom")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void spectrum_intf1_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void spectrum_intf1_device::device_reset()
{
m_exp->set_io_space(&io_space());
m_romcs = 0;
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
READ_LINE_MEMBER(spectrum_intf1_device::romcs)
{
return m_romcs | m_exp->romcs();
}
READ8_MEMBER(spectrum_intf1_device::mreq_r)
{
uint8_t temp;
uint8_t data = 0xff;
if (!machine().side_effects_disabled())
{
if (offset == 0x0008 || offset == 0x1708)
m_romcs = 1;
}
temp = m_exp->mreq_r(space, offset);
if (m_exp->romcs())
data &= temp;
if (m_romcs)
data &= m_rom->base()[offset & 0x1fff];
if (!machine().side_effects_disabled())
{
if (offset == 0x0700)
m_romcs = 0;
}
return data;
}
WRITE8_MEMBER(spectrum_intf1_device::mreq_w)
{
if (m_exp->romcs())
m_exp->mreq_w(space, offset, data);
}
READ8_MEMBER(spectrum_intf1_device::port_fe_r)
{
uint8_t data = 0xff;
if (m_exp->romcs())
data &= m_exp->port_fe_r(space, offset);
return data;
}
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