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// license: GPL-2.0+
// copyright-holders: Dirk Best
/***************************************************************************
SAMBUS 4-slot Expansion Interface for SAM Coupe
***************************************************************************/
#include "emu.h"
#include "sambus.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(SAM_SAMBUS, sam_sambus_device, "sambus", "SAMBUS 4-slot Expansion Interface")
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void sam_sambus_device::device_add_mconfig(machine_config &config)
{
MSM6242(config, m_rtc, 32.768_kHz_XTAL);
SAMCOUPE_EXPANSION(config, m_exp[0], samcoupe_expansion_modules);
SAMCOUPE_EXPANSION(config, m_exp[1], samcoupe_expansion_modules);
SAMCOUPE_EXPANSION(config, m_exp[2], samcoupe_expansion_modules);
SAMCOUPE_EXPANSION(config, m_exp[3], samcoupe_expansion_modules);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// sam_sambus_device - constructor
//-------------------------------------------------
sam_sambus_device::sam_sambus_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, SAM_SAMBUS, tag, owner, clock),
device_samcoupe_expansion_interface(mconfig, *this),
m_rtc(*this, "rtc"),
m_exp(*this, "%u", 0U),
m_print(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sam_sambus_device::device_start()
{
// register for savestates
save_item(NAME(m_print));
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
void sam_sambus_device::xmem_w(int state)
{
for (int i = 0; i < 4; i++)
m_exp[i]->xmem_w(state);
}
void sam_sambus_device::print_w(int state)
{
for (int i = 0; i < 4; i++)
m_exp[i]->print_w(state);
m_print = state;
}
uint8_t sam_sambus_device::mreq_r(offs_t offset)
{
uint8_t data = 0xff;
for (int i = 0; i < 4; i++)
data &= m_exp[i]->mreq_r(offset);
return data;
}
void sam_sambus_device::mreq_w(offs_t offset, uint8_t data)
{
for (int i = 0; i < 4; i++)
m_exp[i]->mreq_w(offset, data);
}
uint8_t sam_sambus_device::iorq_r(offs_t offset)
{
uint8_t data = 0xff;
if (m_print && (offset & 0x07) == 0x07)
data &= m_rtc->read(offset >> 12);
for (int i = 0; i < 4; i++)
data &= m_exp[i]->iorq_r(offset);
return data;
}
void sam_sambus_device::iorq_w(offs_t offset, uint8_t data)
{
if (m_print && (offset & 0x07) == 0x07)
m_rtc->write(offset >> 12, data);
for (int i = 0; i < 4; i++)
m_exp[i]->iorq_w(offset, data);
}
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