mirror of
https://github.com/holub/mame
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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/**********************************************************************
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Commodore 128 COMAL 80 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 "c128_comal80.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C128_COMAL80 = &device_creator<c128_comal80_cartridge_device>;
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c128_comal80_cartridge_device - constructor
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//-------------------------------------------------
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c128_comal80_cartridge_device::c128_comal80_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, C128_COMAL80, "C128 COMAL 80 cartridge", tag, owner, clock, "c128_comal80", __FILE__),
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device_c64_expansion_card_interface(mconfig, *this),
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m_bank(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 c128_comal80_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 c128_comal80_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 c128_comal80_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 (!romh)
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{
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offs_t addr = ((m_bank & 0x07) << 14) | (offset & 0x3fff);
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data = m_romh[addr];
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}
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else if (!io1)
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{
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data = (m_bank << 4) | (data & 0x0f);
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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 c128_comal80_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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/*
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bit description
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0
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1
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2
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3
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4 A14
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5 A15
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6 A16
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7 A17
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*/
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m_bank = data >> 4;
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}
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}
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