diff options
Diffstat (limited to 'src/emu/bus/cbm2/std.c')
-rw-r--r-- | src/emu/bus/cbm2/std.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/emu/bus/cbm2/std.c b/src/emu/bus/cbm2/std.c new file mode 100644 index 00000000000..a872201b968 --- /dev/null +++ b/src/emu/bus/cbm2/std.c @@ -0,0 +1,68 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore CBM-II Standard cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "std.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type CBM2_STD = &device_creator<cbm2_standard_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// cbm2_standard_cartridge_device - constructor +//------------------------------------------------- + +cbm2_standard_cartridge_device::cbm2_standard_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, CBM2_STD, "CBM-II standard cartridge", tag, owner, clock, "cbm2_standard", __FILE__), + device_cbm2_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void cbm2_standard_cartridge_device::device_start() +{ +} + + +//------------------------------------------------- +// cbm2_bd_r - cartridge data read +//------------------------------------------------- + +UINT8 cbm2_standard_cartridge_device::cbm2_bd_r(address_space &space, offs_t offset, UINT8 data, int csbank1, int csbank2, int csbank3) +{ + if (!csbank1 && m_bank1_mask) + { + data = m_bank1[offset & m_bank1_mask]; + } + else if (!csbank2 && m_bank2_mask) + { + data = m_bank2[offset & m_bank2_mask]; + } + else if (!csbank3 && m_bank3_mask) + { + data = m_bank3[offset & m_bank3_mask]; + } + + return data; +} |