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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Tangerine TANRAM (MT013 Iss2)
http://www.microtan.ukpc.net/pageProducts.html#RAM
**********************************************************************/
#include "emu.h"
#include "tanram.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(TANBUS_TANRAM, tanbus_tanram_device, "tanbus_tanram", "Tangerine Tanram Board")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// tanbus_tanram_device - constructor
//-------------------------------------------------
tanbus_tanram_device::tanbus_tanram_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, TANBUS_TANRAM, tag, owner, clock)
, device_tanbus_interface(mconfig, *this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void tanbus_tanram_device::device_start()
{
m_ram = std::make_unique<uint8_t[]>(0x9c00);
save_pointer(NAME(m_ram), 0x9c00);
}
//-------------------------------------------------
// read - card read
//-------------------------------------------------
uint8_t tanbus_tanram_device::read(offs_t offset, int inhrom, int inhram, int be)
{
uint8_t data = 0xff;
if (be && !inhram)
{
/* 32K dynamic ram */
if ((offset >= 0x2000) && (offset < 0xa000))
{
data = m_ram[offset - 0x2000];
}
/* 7K static ram */
if ((offset >= 0xa000) && (offset < 0xbc00))
{
data = m_ram[offset - 0xa000];
}
}
return data;
}
//-------------------------------------------------
// write - card write
//-------------------------------------------------
void tanbus_tanram_device::write(offs_t offset, uint8_t data, int inhrom, int inhram, int be)
{
if (be && !inhram)
{
/* 32K dynamic ram */
if ((offset >= 0x2000) && (offset < 0xa000))
{
m_ram[offset - 0x2000] = data;
}
/* 7K static ram */
if ((offset >= 0xa000) && (offset < 0xbc00))
{
m_ram[offset - 0xa000] = data;
}
}
}
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