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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
First Byte Switched Joystick Interface
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/FirstByte_JoystickIF.html
**********************************************************************/
#include "emu.h"
#include "fbjoy.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ELECTRON_FBJOY, electron_fbjoy_device, "electron_fbjoy", "First Byte Joystick Interface")
static INPUT_PORTS_START( fbjoy )
PORT_START("JOY")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP) PORT_8WAY
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN) PORT_8WAY
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT) PORT_8WAY
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT) PORT_8WAY
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("Fire")
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor electron_fbjoy_device::device_input_ports() const
{
return INPUT_PORTS_NAME( fbjoy );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// electron_fbjoy_device - constructor
//-------------------------------------------------
electron_fbjoy_device::electron_fbjoy_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, ELECTRON_FBJOY, tag, owner, clock)
, device_electron_expansion_interface(mconfig, *this)
, m_joy(*this, "JOY")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void electron_fbjoy_device::device_start()
{
}
//-------------------------------------------------
// expbus_r - expansion data read
//-------------------------------------------------
uint8_t electron_fbjoy_device::expbus_r(offs_t offset)
{
uint8_t data = 0xff;
if (offset == 0xfcc0)
{
data = m_joy->read() | 0xe0;
}
return data;
}
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