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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
GCC (Cambridge) Romex 13
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/GCC_Romex13.html
**********************************************************************/
#include "emu.h"
#include "romex.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(BBC_ROMEX13, bbc_romex13_device, "bbc_romex13", "GCC Romex13 ROM Expansion");
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void bbc_romex13_device::device_add_mconfig(machine_config &config)
{
/* TODO: romslot2 is unavailable when board is fitted, replaced by socket on board */
//config.device_remove(":romslot2");
/* 13 rom sockets */
BBC_ROMSLOT16(config, m_rom[2], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[4], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[5], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[6], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[7], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[8], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[9], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[10], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[11], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[12], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[13], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[14], bbc_rom_devices, nullptr);
BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, nullptr);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_romex13_device - constructor
//-------------------------------------------------
bbc_romex13_device::bbc_romex13_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, BBC_ROMEX13, tag, owner, clock)
, device_bbc_internal_interface(mconfig, *this)
, m_rom(*this, "romslot%u", 0U)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_romex13_device::device_start()
{
/* move internal roms to board */
memmove(m_region_swr->base() + 0x30000, m_region_swr->base(), 0x10000);
memset(m_region_swr->base(), 0xff, 0x10000);
/* register for save states */
save_item(NAME(m_romsel));
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t bbc_romex13_device::paged_r(offs_t offset)
{
uint8_t data = 0xff;
switch (m_romsel)
{
case 0: case 1: case 3:
/* motherboard rom sockets */
if (m_mb_rom[m_romsel] && m_mb_rom[m_romsel]->present())
{
data = m_mb_rom[m_romsel]->read(offset);
}
else
{
data = m_region_swr->base()[offset + (m_romsel << 14)];
}
break;
default:
/* expansion board sockets */
if (m_rom[m_romsel] && m_rom[m_romsel]->present())
{
data = m_rom[m_romsel]->read(offset);
}
else
{
data = m_region_swr->base()[offset + (m_romsel << 14)];
}
break;
}
return data;
}
void bbc_romex13_device::paged_w(offs_t offset, uint8_t data)
{
switch (m_romsel)
{
case 0: case 1: case 3:
/* motherboard rom sockets */
if (m_mb_rom[m_romsel])
{
m_mb_rom[m_romsel]->write(offset, data);
}
break;
default:
/* expansion board sockets */
if (m_rom[m_romsel])
{
m_rom[m_romsel]->write(offset, data);
}
break;
}
}
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