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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
MOS 8726R1 DMA Controller emulation
**********************************************************************/
/*
TODO:
- all
*/
#include "mos8726.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
//**************************************************************************
// DEVICE TYPE DEFINITIONS
//**************************************************************************
const device_type MOS8726 = &device_creator<mos8726_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// mos8726_device - constructor
//-------------------------------------------------
mos8726_device::mos8726_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, MOS8726, "MOS8726", tag, owner, clock, "mos8726", __FILE__),
device_execute_interface(mconfig, *this),
m_icount(0),
m_bs(1)
{ }
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void mos8726_device::device_start()
{
// set our instruction counter
m_icountptr = &m_icount;
// save state
save_item(NAME(m_bs));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void mos8726_device::device_reset()
{
}
//-------------------------------------------------
// execute_run -
//-------------------------------------------------
void mos8726_device::execute_run()
{
do
{
m_icount--;
} while (m_icount > 0);
}
//-------------------------------------------------
// read -
//-------------------------------------------------
READ8_MEMBER( mos8726_device::read )
{
UINT8 data = 0;
return data;
}
//-------------------------------------------------
// write -
//-------------------------------------------------
WRITE8_MEMBER( mos8726_device::write )
{
}
//-------------------------------------------------
// bs_w - bank select write
//-------------------------------------------------
WRITE_LINE_MEMBER( mos8726_device::bs_w )
{
m_bs = state;
}
//-------------------------------------------------
// romsel_r - ROM select read
//-------------------------------------------------
int mos8726_device::romsel_r(int roml, int romh)
{
return roml && romh;
}
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