// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Commodore VIC-1112 IEEE-488 Interface Cartridge emulation **********************************************************************/ #include "emu.h" #include "vic1112.h" //************************************************************************** // MACROS / CONSTANTS //************************************************************************** #define M6522_0_TAG "u4" #define M6522_1_TAG "u5" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(VIC1112, vic1112_device, "vic1112", "VIC-1112 IEEE-488 Interface") WRITE_LINE_MEMBER( vic1112_device::via0_irq_w ) { m_via0_irq = state; m_slot->irq_w(m_via0_irq | m_via1_irq); } uint8_t vic1112_device::via0_pb_r() { /* bit description PB0 PB1 PB2 PB3 _EOI PB4 _DAV IN PB5 _NRFD IN PB6 _NDAC IN PB7 _ATN IN */ uint8_t data = 0; data |= m_bus->eoi_r() << 3; data |= m_bus->dav_r() << 4; data |= m_bus->nrfd_r() << 5; data |= m_bus->ndac_r() << 6; data |= m_bus->atn_r() << 7; return data; } void vic1112_device::via0_pb_w(uint8_t data) { /* bit description PB0 _DAV OUT PB1 _NRFD OUT PB2 _NDAC OUT PB3 PB4 PB5 PB6 PB7 */ m_bus->host_dav_w(BIT(data, 0)); m_bus->host_nrfd_w(BIT(data, 1)); m_bus->host_ndac_w(BIT(data, 2)); } WRITE_LINE_MEMBER( vic1112_device::via1_irq_w ) { m_via1_irq = state; m_slot->irq_w(m_via0_irq | m_via1_irq); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void vic1112_device::device_add_mconfig(machine_config &config) { MOS6522(config, m_via0, DERIVED_CLOCK(1, 1)); m_via0->readpb_handler().set(FUNC(vic1112_device::via0_pb_r)); m_via0->writepb_handler().set(FUNC(vic1112_device::via0_pb_w)); m_via0->irq_handler().set(FUNC(vic1112_device::via0_irq_w)); MOS6522(config, m_via1, DERIVED_CLOCK(1, 1)); m_via1->readpb_handler().set(IEEE488_TAG, FUNC(ieee488_device::dio_r)); m_via1->writepa_handler().set(IEEE488_TAG, FUNC(ieee488_device::host_dio_w)); m_via1->ca2_handler().set(IEEE488_TAG, FUNC(ieee488_device::host_atn_w)); m_via1->cb2_handler().set(IEEE488_TAG, FUNC(ieee488_device::host_eoi_w)); m_via1->irq_handler().set(FUNC(vic1112_device::via1_irq_w)); IEEE488(config, m_bus); ieee488_slot_device::add_cbm_defaults(config, nullptr); m_bus->srq_callback().set(m_via1, FUNC(via6522_device::write_cb1)); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // vic1112_device - constructor //------------------------------------------------- vic1112_device::vic1112_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, VIC1112, tag, owner, clock) , device_vic20_expansion_card_interface(mconfig, *this) , m_via0(*this, M6522_0_TAG) , m_via1(*this, M6522_1_TAG) , m_bus(*this, IEEE488_TAG) , m_via0_irq(0), m_via1_irq(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void vic1112_device::device_start() { // state saving save_item(NAME(m_via0_irq)); save_item(NAME(m_via1_irq)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void vic1112_device::device_reset() { m_bus->host_ifc_w(0); m_bus->host_ifc_w(1); } //------------------------------------------------- // vic20_cd_r - cartridge data read //------------------------------------------------- uint8_t vic1112_device::vic20_cd_r(offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { if (!io2) { data = (BIT(offset, 4) ? m_via1 : m_via0)->read(offset & 0x0f); } else if (!blk5) { if (offset & 0x1000) data = m_blk5[offset & 0x17ff]; } return data; } //------------------------------------------------- // vic20_cd_w - cartridge data write //------------------------------------------------- void vic1112_device::vic20_cd_w(offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { if (!io2) { (BIT(offset, 4) ? m_via1 : m_via0)->write(offset & 0x0f, data); } }