mirror of
https://github.com/holub/mame
synced 2025-05-12 00:58:53 +03:00
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/**********************************************************************
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System 3 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 "c64_system3.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C64_SYSTEM3 = &device_creator<c64_system3_cartridge_device>;
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c64_system3_cartridge_device - constructor
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//-------------------------------------------------
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c64_system3_cartridge_device::c64_system3_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, C64_SYSTEM3, "C64 System 3 cartridge", tag, owner, clock),
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device_c64_expansion_card_interface(mconfig, *this)
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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 c64_system3_cartridge_device::device_start()
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{
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// state saving
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save_item(NAME(m_bank));
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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 c64_system3_cartridge_device::device_reset()
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{
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m_bank = 0;
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}
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//-------------------------------------------------
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// c64_cd_r - cartridge data read
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//-------------------------------------------------
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UINT8 c64_system3_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
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{
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if (!roml)
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{
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offs_t addr = (m_bank << 13) | (offset & 0x1fff);
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data = m_roml[addr];
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}
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else if (!io1)
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{
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m_bank = offset & 0x3f;
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m_game = 1;
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data = 0;
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}
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return data;
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}
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//-------------------------------------------------
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// c64_cd_w - cartridge data write
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//-------------------------------------------------
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void c64_system3_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
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{
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if (!io1)
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{
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m_bank = offset & 0x3f;
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m_game = 0;
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}
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}
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