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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Rex Datentechnik 256KB EPROM cartridge emulation
**********************************************************************/
#include "emu.h"
#include "rex_ep256.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(C64_REX_EP256, c64_rex_ep256_cartridge_device, "c64_rex_ep256", "C64 Rex 256KB EPROM cartridge")
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void c64_rex_ep256_cartridge_device::device_add_mconfig(machine_config &config)
{
for (auto &eprom : m_eproms)
GENERIC_SOCKET(config, eprom, generic_linear_slot, nullptr, "bin,rom");
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c64_rex_ep256_cartridge_device - constructor
//-------------------------------------------------
c64_rex_ep256_cartridge_device::c64_rex_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, C64_REX_EP256, tag, owner, clock),
device_c64_expansion_card_interface(mconfig, *this),
m_eproms(*this, "rom%u", 1U)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void c64_rex_ep256_cartridge_device::device_start()
{
// state saving
save_item(NAME(m_bank));
save_item(NAME(m_reset));
save_item(NAME(m_socket));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void c64_rex_ep256_cartridge_device::device_reset()
{
m_exrom = 0;
m_reset = 1;
m_bank = 0;
m_socket = 0;
}
//-------------------------------------------------
// c64_cd_r - cartridge data read
//-------------------------------------------------
uint8_t c64_rex_ep256_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
if (!roml)
{
if (m_reset)
{
data = m_roml[offset & 0x1fff];
}
else
{
offs_t addr = (m_bank << 13) | (offset & 0x1fff);
data = m_eproms[m_socket]->read_rom(addr);
}
}
else if (!io2)
{
if ((offset & 0xf0) == 0xc0)
{
m_exrom = 1;
}
else if ((offset & 0xf0) == 0xe0)
{
m_exrom = 0;
}
}
return data;
}
//-------------------------------------------------
// c64_cd_w - cartridge data write
//-------------------------------------------------
void c64_rex_ep256_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
if (!io2 && ((offset & 0xf0) == 0xa0))
{
/*
bit description
0 socket selection bit 0
1 socket selection bit 1
2 socket selection bit 2
3
4
5 bank selection bit 0
6 bank selection bit 1
7
*/
m_reset = 0;
m_socket = data & 0x07;
m_bank = (data >> 5) & 0x03;
}
}
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