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electron: Added Mega Games Cartridge device.

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This commit is contained in:
Nigel Barnes 2018-03-30 12:38:23 +01:00
parent 61c7349334
commit d295e418c4
4 changed files with 163 additions and 0 deletions
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2
scripts/src/bus.lua
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@ -759,6 +759,8 @@ if (BUSES["ELECTRON_CART"]~=null) then
MAME_DIR .. "src/devices/bus/electron/cart/click.h",
MAME_DIR .. "src/devices/bus/electron/cart/cumana.cpp",
MAME_DIR .. "src/devices/bus/electron/cart/cumana.h",
MAME_DIR .. "src/devices/bus/electron/cart/mgc.cpp",
MAME_DIR .. "src/devices/bus/electron/cart/mgc.h",
MAME_DIR .. "src/devices/bus/electron/cart/peg400.cpp",
MAME_DIR .. "src/devices/bus/electron/cart/peg400.h",
MAME_DIR .. "src/devices/bus/electron/cart/sndexp.cpp",

112
src/devices/bus/electron/cart/mgc.cpp Normal file
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@ -0,0 +1,112 @@
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
Mega Games Cartridge
The Mega Games Cartridge (MGC) is a Cartridge for the Acorn Electron,
with an Acorn/P.R.E.S. Plus 1 or a Slogger RomBox Plus fitted. It
contains a 32 Megabit (4M x 8-Bit) FlashRAM, plus control circuitry, to
give 256 x 16K pages of Memory. These 16K blocks can be viewed in
various formats. The MGC has been designed to hold and access, via the
built-in Menu, up-to 254 Games (the Index and Menu ROM take up the other
two 16K blocks).
***************************************************************************/
#include "emu.h"
#include "mgc.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ELECTRON_MGC, electron_mgc_device, "electron_mgc", "Electron Mega Games Cartridge")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// electron_mgc_device - constructor
//-------------------------------------------------
electron_mgc_device::electron_mgc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, ELECTRON_MGC, tag, owner, clock)
, device_electron_cart_interface(mconfig, *this)
, m_page_latch(0)
, m_control_latch(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void electron_mgc_device::device_start()
{
save_item(NAME(m_page_latch));
save_item(NAME(m_control_latch));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void electron_mgc_device::device_reset()
{
m_page_latch = 0;
m_control_latch = 0;
}
//-------------------------------------------------
// read - cartridge data read
//-------------------------------------------------
uint8_t electron_mgc_device::read(address_space &space, offs_t offset, int infc, int infd, int romqa)
{
uint8_t data = 0xff;
if (!infc && !infd)
{
if (offset >= 0x0000 && offset < 0x4000)
{
int m_page_mode = BIT(m_control_latch, 2) ? BIT(m_control_latch, 1) : !romqa;
data = m_nvram[(offset & 0x3fff) | (m_page_latch << 14) | (m_page_mode << 21)];
}
}
return data;
}
//-------------------------------------------------
// write - cartridge data write
//-------------------------------------------------
void electron_mgc_device::write(address_space &space, offs_t offset, uint8_t data, int infc, int infd, int romqa)
{
if (infc)
{
switch (offset)
{
case 0x00:
m_page_latch = data & 0x7f;
break;
case 0x08:
m_control_latch = data & 0x07;
break;
}
}
if (!infc && !infd)
{
if (offset >= 0x0000 && offset < 0x4000 && BIT(m_control_latch, 0))
{
int m_page_mode = BIT(m_control_latch, 2) ? BIT(m_control_latch, 1) : !romqa;
m_nvram[(offset & 0x3fff) | (m_page_latch << 14) | (m_page_mode << 21)] = data;
}
}
}

47
src/devices/bus/electron/cart/mgc.h Normal file
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@ -0,0 +1,47 @@
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
Mega Games Cartridge
***************************************************************************/
#ifndef MAME_BUS_ELECTRON_CART_MGC_H
#define MAME_BUS_ELECTRON_CART_MGC_H
#pragma once
#include "slot.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> electron_mgc_device
class electron_mgc_device : public device_t,
public device_electron_cart_interface
{
public:
// construction/destruction
electron_mgc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// electron_cart_interface overrides
virtual uint8_t read(address_space &space, offs_t offset, int infc, int infd, int romqa) override;
virtual void write(address_space &space, offs_t offset, uint8_t data, int infc, int infd, int romqa) override;
private:
uint8_t m_page_latch;
uint8_t m_control_latch;
};
// device type definition
DECLARE_DEVICE_TYPE(ELECTRON_MGC, electron_mgc_device)
#endif // MAME_BUS_ELECTRON_CART_MGC_H

2
src/devices/bus/electron/cart/slot.cpp
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@ -271,6 +271,7 @@ void electron_cartslot_device::write(address_space &space, offs_t offset, uint8_
#include "aqr.h"
#include "click.h"
#include "cumana.h"
#include "mgc.h"
#include "peg400.h"
#include "sndexp.h"
#include "sndexp3.h"
@ -286,6 +287,7 @@ SLOT_INTERFACE_START(electron_cart)
SLOT_INTERFACE_INTERNAL("aqr", ELECTRON_AQR)
SLOT_INTERFACE_INTERNAL("click", ELECTRON_CLICK)
SLOT_INTERFACE_INTERNAL("cumana", ELECTRON_CUMANA)
SLOT_INTERFACE_INTERNAL("mgc", ELECTRON_MGC)
SLOT_INTERFACE_INTERNAL("peg400", ELECTRON_PEG400)
SLOT_INTERFACE_INTERNAL("sndexp", ELECTRON_SNDEXP)
SLOT_INTERFACE_INTERNAL("sndexp3", ELECTRON_SNDEXP3)