mirror of
https://github.com/holub/mame
synced 2025-05-30 01:23:07 +03:00
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/**********************************************************************
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Mega-Cart cartridge emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#include "vic20_megacart.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type VIC20_MEGACART = &device_creator<vic20_megacart_device>;
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//-------------------------------------------------
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// MACHINE_DRIVER( vic1112 )
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( vic1112 )
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MACHINE_CONFIG_END
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor vic20_megacart_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( vic1112 );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// vic20_megacart_device - constructor
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//-------------------------------------------------
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vic20_megacart_device::vic20_megacart_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, VIC20_MEGACART, "Mega-Cart", tag, owner, clock, "megacart", __FILE__),
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device_vic20_expansion_card_interface(mconfig, *this),
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device_nvram_interface(mconfig, *this),
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m_nvram_en(0)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void vic20_megacart_device::device_start()
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{
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// state saving
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save_item(NAME(m_nvram_en));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void vic20_megacart_device::device_reset()
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{
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}
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//-------------------------------------------------
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// vic20_cd_r - cartridge data read
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//-------------------------------------------------
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UINT8 vic20_megacart_device::vic20_cd_r(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
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{
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if (!ram1 || !ram2 || !ram3 || !io2 || !io3)
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{
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if (m_nvram_en)
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{
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data = m_nvram[offset & 0x1fff];
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}
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}
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else if (!blk1 || !blk2 || !blk3)
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{
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}
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else if (!blk5)
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{
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}
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return data;
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}
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//-------------------------------------------------
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// vic20_cd_w - cartridge data write
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//-------------------------------------------------
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void vic20_megacart_device::vic20_cd_w(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
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{
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if (!ram1 || !ram2 || !ram3 || !io2)
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{
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if (m_nvram_en)
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{
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m_nvram[offset & 0x1fff] = data;
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}
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}
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else if (!blk1 || !blk2 || !blk3)
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{
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}
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else if (!blk5)
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{
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}
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else if (!io3)
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{
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if (m_nvram_en)
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{
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m_nvram[offset & 0x1fff] = data;
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}
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}
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}
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