diff options
Diffstat (limited to 'src/devices/bus/vic20/exp.c')
-rw-r--r-- | src/devices/bus/vic20/exp.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/exp.c b/src/devices/bus/vic20/exp.c new file mode 100644 index 00000000000..bab88756ff5 --- /dev/null +++ b/src/devices/bus/vic20/exp.c @@ -0,0 +1,229 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore VIC-20 Expansion Port emulation + +**********************************************************************/ + +#include "exp.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type VIC20_EXPANSION_SLOT = &device_creator<vic20_expansion_slot_device>; + + + +//************************************************************************** +// DEVICE VIC20_EXPANSION CARD INTERFACE +//************************************************************************** + +//------------------------------------------------- +// device_vic20_expansion_card_interface - constructor +//------------------------------------------------- + +device_vic20_expansion_card_interface::device_vic20_expansion_card_interface(const machine_config &mconfig, device_t &device) + : device_slot_card_interface(mconfig, device), + m_blk1(*this, "blk1"), + m_blk2(*this, "blk2"), + m_blk3(*this, "blk3"), + m_blk5(*this, "blk5"), + m_nvram(*this, "nvram") +{ + m_slot = dynamic_cast<vic20_expansion_slot_device *>(device.owner()); +} + + +//------------------------------------------------- +// ~device_vic20_expansion_card_interface - destructor +//------------------------------------------------- + +device_vic20_expansion_card_interface::~device_vic20_expansion_card_interface() +{ +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// vic20_expansion_slot_device - constructor +//------------------------------------------------- + +vic20_expansion_slot_device::vic20_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, VIC20_EXPANSION_SLOT, "VIC-20 expansion port", tag, owner, clock, "vic20_expansion_slot", __FILE__), + device_slot_interface(mconfig, *this), + device_image_interface(mconfig, *this), + m_write_irq(*this), + m_write_nmi(*this), + m_write_res(*this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void vic20_expansion_slot_device::device_start() +{ + m_card = dynamic_cast<device_vic20_expansion_card_interface *>(get_card_device()); + + // resolve callbacks + m_write_irq.resolve_safe(); + m_write_nmi.resolve_safe(); + m_write_res.resolve_safe(); + + // inherit bus clock + if (clock() == 0) + { + vic20_expansion_slot_device *root = machine().device<vic20_expansion_slot_device>(VIC20_EXPANSION_SLOT_TAG); + assert(root); + set_unscaled_clock(root->clock()); + } +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void vic20_expansion_slot_device::device_reset() +{ + if (get_card_device()) + { + get_card_device()->reset(); + } +} + + +//------------------------------------------------- +// call_load - +//------------------------------------------------- + +bool vic20_expansion_slot_device::call_load() +{ + if (m_card) + { + if (software_entry() == NULL) + { + if (!core_stricmp(filetype(), "20")) fread(m_card->m_blk1, 0x2000); + else if (!core_stricmp(filetype(), "40")) fread(m_card->m_blk2, 0x2000); + else if (!core_stricmp(filetype(), "60")) fread(m_card->m_blk3, 0x2000); + else if (!core_stricmp(filetype(), "70")) fread(m_card->m_blk3, 0x2000, 0x1000); + else if (!core_stricmp(filetype(), "a0")) fread(m_card->m_blk5, 0x2000); + else if (!core_stricmp(filetype(), "b0")) fread(m_card->m_blk5, 0x2000, 0x1000); + else if (!core_stricmp(filetype(), "crt")) + { + // read the header + UINT8 header[2]; + fread(&header, 2); + UINT16 address = (header[1] << 8) | header[0]; + + switch (address) + { + case 0x2000: fread(m_card->m_blk1, 0x2000); break; + case 0x4000: fread(m_card->m_blk2, 0x2000); break; + case 0x6000: fread(m_card->m_blk3, 0x2000); break; + case 0x7000: fread(m_card->m_blk3, 0x2000, 0x1000); break; + case 0xa000: fread(m_card->m_blk5, 0x2000); break; + case 0xb000: fread(m_card->m_blk5, 0x2000, 0x1000); break; + default: return IMAGE_INIT_FAIL; + } + } + } + else + { + load_software_region("blk1", m_card->m_blk1); + load_software_region("blk2", m_card->m_blk2); + load_software_region("blk3", m_card->m_blk3); + load_software_region("blk5", m_card->m_blk5); + } + } + + return IMAGE_INIT_PASS; +} + + +//------------------------------------------------- +// call_softlist_load - +//------------------------------------------------- + +bool vic20_expansion_slot_device::call_softlist_load(software_list_device &swlist, const char *swname, const rom_entry *start_entry) +{ + load_software_part_region(*this, swlist, swname, start_entry); + + return true; +} + + +//------------------------------------------------- +// get_default_card_software - +//------------------------------------------------- + +void vic20_expansion_slot_device::get_default_card_software(std::string &result) +{ + software_get_default_slot(result, "standard"); +} + + +//------------------------------------------------- +// cd_r - cartridge data read +//------------------------------------------------- + +UINT8 vic20_expansion_slot_device::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) +{ + if (m_card != NULL) + { + data = m_card->vic20_cd_r(space, offset, data, ram1, ram2, ram3, blk1, blk2, blk3, blk5, io2, io3); + } + + return data; +} + + +//------------------------------------------------- +// cd_w - cartridge data write +//------------------------------------------------- + +void vic20_expansion_slot_device::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) +{ + if (m_card != NULL) + { + m_card->vic20_cd_w(space, offset, data, ram1, ram2, ram3, blk1, blk2, blk3, blk5, io2, io3); + } +} + + +//------------------------------------------------- +// SLOT_INTERFACE( vic20_expansion_cards ) +//------------------------------------------------- + +// slot devices +#include "fe3.h" +#include "megacart.h" +#include "std.h" +#include "vic1010.h" +#include "vic1110.h" +#include "vic1111.h" +#include "vic1112.h" +#include "vic1210.h" + +SLOT_INTERFACE_START( vic20_expansion_cards ) + SLOT_INTERFACE("exp", VIC1010) + SLOT_INTERFACE("3k", VIC1210) + SLOT_INTERFACE("8k", VIC1110) + SLOT_INTERFACE("16k", VIC1111) + SLOT_INTERFACE("fe3", VIC20_FE3) + + // the following need ROMs from the software list + SLOT_INTERFACE_INTERNAL("standard", VIC20_STD) + SLOT_INTERFACE_INTERNAL("ieee488", VIC1112) + SLOT_INTERFACE_INTERNAL("megacart", VIC20_MEGACART) +SLOT_INTERFACE_END |