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/**********************************************************************
Commodore PET Memory Expansion Port emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "machine/petexp.h"
//**************************************************************************
// MACROS/CONSTANTS
//**************************************************************************
#define LOG 0
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type PET_EXPANSION_SLOT = &device_creator<pet_expansion_slot_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// pet_expansion_slot_device - constructor
//-------------------------------------------------
pet_expansion_slot_device::pet_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, PET_EXPANSION_SLOT, "PET memory expansion port", tag, owner, clock),
device_slot_interface(mconfig, *this),
m_read_dma(*this),
m_write_dma(*this)
{
}
//-------------------------------------------------
// pet_expansion_slot_device - destructor
//-------------------------------------------------
pet_expansion_slot_device::~pet_expansion_slot_device()
{
}
//-------------------------------------------------
// device_pet_expansion_card_interface - constructor
//-------------------------------------------------
device_pet_expansion_card_interface::device_pet_expansion_card_interface(const machine_config &mconfig, device_t &device)
: device_slot_card_interface(mconfig, device)
{
m_slot = dynamic_cast<pet_expansion_slot_device *>(device.owner());
}
//-------------------------------------------------
// ~device_pet_expansion_card_interface - destructor
//-------------------------------------------------
device_pet_expansion_card_interface::~device_pet_expansion_card_interface()
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pet_expansion_slot_device::device_start()
{
m_card = dynamic_cast<device_pet_expansion_card_interface *>(get_card_device());
// resolve callbacks
m_read_dma.resolve_safe(0);
m_write_dma.resolve_safe();
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void pet_expansion_slot_device::device_reset()
{
if (m_card != NULL)
{
get_card_device()->reset();
}
}
//-------------------------------------------------
// norom_r - NO ROM read
//-------------------------------------------------
int pet_expansion_slot_device::norom_r(address_space &space, offs_t offset, int sel)
{
return m_card ? m_card->pet_norom_r(space, offset, sel) : 1;
}
//-------------------------------------------------
// read - buffered data read
//-------------------------------------------------
UINT8 pet_expansion_slot_device::read(address_space &space, offs_t offset, UINT8 data, int &sel)
{
if (m_card != NULL)
{
data = m_card->pet_bd_r(space, offset, data, sel);
}
return data;
}
//-------------------------------------------------
// write - buffered data write
//-------------------------------------------------
void pet_expansion_slot_device::write(address_space &space, offs_t offset, UINT8 data, int &sel)
{
if (m_card != NULL)
{
m_card->pet_bd_w(space, offset, data, sel);
}
}
//-------------------------------------------------
// diag_r - DIAG read
//-------------------------------------------------
READ_LINE_MEMBER( pet_expansion_slot_device::diag_r )
{
return m_card ? m_card->pet_diag_r() : 1;
}
//-------------------------------------------------
// irq_w - IRQ write
//-------------------------------------------------
WRITE_LINE_MEMBER( pet_expansion_slot_device::irq_w )
{
if (m_card) m_card->pet_irq_w(state);
}
//-------------------------------------------------
// dma_bd_r - DMA read
//-------------------------------------------------
UINT8 pet_expansion_slot_device::dma_bd_r(offs_t offset)
{
return m_read_dma(offset);
}
//-------------------------------------------------
// dma_bd_w - DMA write
//-------------------------------------------------
void pet_expansion_slot_device::dma_bd_w(offs_t offset, UINT8 data)
{
m_write_dma(offset, data);
}
//-------------------------------------------------
// phi2 - system clock frequency
//-------------------------------------------------
int pet_expansion_slot_device::phi2()
{
return clock();
}
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