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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
Slogger Click cartridge emulation
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Slogger_Click.html
The Master version of the Click cartridge differs from the Electron
version:
Master 128 Electron
ROM 16K 32K
RAM (battery) 8K 32K
The data lines D1 and D2 are swapped between edge connector and ROM/RAM.
***************************************************************************/
#include "emu.h"
#include "click.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(BBC_CLICK, bbc_click_device, "bbc_click", "Slogger Click (Master 128) cartridge")
//-------------------------------------------------
// INPUT_PORTS( clickm )
//-------------------------------------------------
INPUT_PORTS_START(clickm)
PORT_START("BUTTON")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("Click") PORT_CODE(KEYCODE_HOME) PORT_CHANGED_MEMBER(DEVICE_SELF, bbc_click_device, click_button, 0)
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor bbc_click_device::device_input_ports() const
{
return INPUT_PORTS_NAME(clickm);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_click_device - constructor
//-------------------------------------------------
bbc_click_device::bbc_click_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, BBC_CLICK, tag, owner, clock)
, device_bbc_cart_interface(mconfig, *this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_click_device::device_start()
{
}
//-------------------------------------------------
// read - cartridge data read
//-------------------------------------------------
uint8_t bbc_click_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2)
{
uint8_t data = 0xff;
if (oe)
{
if (offset & 0x2000)
{
data = m_nvram[offset & 0x1fff];
}
else
{
data = m_rom[(offset & 0x1fff) | (romqa << 13)];
}
}
return bitswap<8>(data, 7, 6, 5, 4, 3, 1, 2, 0);
}
//-------------------------------------------------
// write - cartridge data write
//-------------------------------------------------
void bbc_click_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2)
{
if (oe)
{
if (offset & 0x2000)
{
m_nvram[offset & 0x1fff] = bitswap<8>(data, 7, 6, 5, 4, 3, 1, 2, 0);
}
}
}
INPUT_CHANGED_MEMBER(bbc_click_device::click_button)
{
m_slot->irq_w(!newval);
}
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