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// license:BSD-3-Clause
// copyright-holders:AJR
/****************************************************************************
Toshiba Pasopia PAC2 slot
This is the smallest of the three Pasopia expansion connectors. Despite
only providing access to a 4-by-8-bit space, this was mostly used for
memory cartridges.
______
CDB 7 1 | . . | 2 CDB 6
GND 3 | . . | 4 CDB 5
CDB 4 5 | . . | 6 CDB 3
GND 7 | . . | 8 CDB 2
CDB 1 9 | . . | 10 CDB 0
CDAD01 11 | . . | 12 CDAD00
GND 13 | . . | 14 CSELP2
CDRD 15 | . . | 16 CDWR
GND 17 | . . | 18 GND
+5V 19 | . . | 20 +5V
------
****************************************************************************/
#include "emu.h"
#include "pac2.h"
#include "pac2exp.h"
#include "rampac2.h"
#include "rompac2.h"
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
DEFINE_DEVICE_TYPE(PASOPIA_PAC2, pasopia_pac2_slot_device, "pasopia_pac2", "Pasopia PAC2 Slot")
//**************************************************************************
// PAC2 SLOT DEVICE
//**************************************************************************
//-------------------------------------------------
// pasopia_pac2_slot_device - construction
//-------------------------------------------------
pasopia_pac2_slot_device::pasopia_pac2_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, PASOPIA_PAC2, tag, owner, clock)
, device_single_card_slot_interface<pac2_card_interface>(mconfig, *this)
, m_card(nullptr)
{
}
//-------------------------------------------------
// device_resolve_objects - resolve objects that
// may be needed for other devices to set
// initial conditions at start time
//-------------------------------------------------
void pasopia_pac2_slot_device::device_resolve_objects()
{
m_card = get_card_device();
if (m_card != nullptr)
m_card->m_slot = this;
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pasopia_pac2_slot_device::device_start()
{
}
//-------------------------------------------------
// read - I/O read access
//-------------------------------------------------
u8 pasopia_pac2_slot_device::read(offs_t offset)
{
if (m_card == nullptr)
{
if (!machine().side_effects_disabled())
logerror("%s: Read from unconnected PAC2 (CDAD = %X)\n", machine().describe_context(), offset);
return 0;
}
return m_card->pac2_read(offset);
}
//-------------------------------------------------
// write - I/O write access
//-------------------------------------------------
void pasopia_pac2_slot_device::write(offs_t offset, u8 data)
{
if (m_card != nullptr)
m_card->pac2_write(offset, data);
}
//**************************************************************************
// PAC2 CARD INTERFACE
//**************************************************************************
//-------------------------------------------------
// pac2_card_interface - construction
//-------------------------------------------------
pac2_card_interface::pac2_card_interface(const machine_config &mconfig, device_t &device)
: device_interface(device, "pac2card")
, m_slot(nullptr)
{
}
//-------------------------------------------------
// interface_pre_start - called before the
// device's own start function
//-------------------------------------------------
void pac2_card_interface::interface_pre_start()
{
if (!m_slot)
throw device_missing_dependencies();
}
//-------------------------------------------------
// pac2_subslot_devices - add standard options
// for subslots
//-------------------------------------------------
void pac2_subslot_devices(device_slot_interface &device)
{
//device.option_add("ram4k", PASOPIA_PA7241);
device.option_add("ram16k", PASOPIA_PA7243);
device.option_add("ram32k", PASOPIA_PA7245);
device.option_add("kanji", PASOPIA_PA7246);
//device.option_add("kanji2", PASOPIA_PA7247);
device.option_add("ram64k", PASOPIA_PA7248);
//device.option_add("joy", PASOPIA_PA7390);
}
//-------------------------------------------------
// pac2_default_devices - add standard options
// for main slots
//-------------------------------------------------
void pac2_default_devices(device_slot_interface &device)
{
device.option_add("exp", PASOPIA_PA7234);
pac2_subslot_devices(device);
}
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