// license:BSD-3-Clause // copyright-holders:AJR /*************************************************************************** DEC VT61 CPU Currently this device is just a stub with no actual execution core. ***************************************************************************/ #include "emu.h" #include "vt61.h" #include "vt61dasm.h" // device type definition DEFINE_DEVICE_TYPE(VT61_CPU, vt61_cpu_device, "vt61_cpu", "DEC VT61 CPU") vt61_cpu_device::vt61_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : cpu_device(mconfig, VT61_CPU, tag, owner, clock) , m_program_config("microprogram", ENDIANNESS_LITTLE, 16, 10, -1) , m_memory_config("memory", ENDIANNESS_LITTLE, 8, 16, 0) , m_idr_config("IDR", ENDIANNESS_LITTLE, 8, 6, 0) , m_program_cache(nullptr) , m_memory_cache(nullptr) , m_idr_cache(nullptr) , m_pc(0) , m_ac(0) , m_mar(0) , m_mdr(0) , m_ir(0) , m_sp{0} , m_icount(0) , m_misc_flags(0) , m_modem_flags(0) , m_intrpt_control(0) { m_program_config.m_is_octal = true; m_memory_config.m_is_octal = true; m_idr_config.m_is_octal = true; } std::unique_ptr vt61_cpu_device::create_disassembler() { return std::make_unique(); } device_memory_interface::space_config_vector vt61_cpu_device::memory_space_config() const { return space_config_vector { std::make_pair(AS_PROGRAM, &m_program_config), std::make_pair(AS_DATA, &m_memory_config), std::make_pair(AS_IDR, &m_idr_config) }; } void vt61_cpu_device::device_start() { m_program_cache = space(AS_PROGRAM).cache<1, -1, ENDIANNESS_LITTLE>(); m_memory_cache = space(AS_DATA).cache<0, 0, ENDIANNESS_LITTLE>(); m_idr_cache = space(AS_IDR).cache<0, 0, ENDIANNESS_LITTLE>(); set_icountptr(m_icount); state_add(VT61_PC, "PC", m_pc).mask(01777).formatstr("%5s"); state_add(STATE_GENPC, "GENPC", m_pc).mask(01777).noshow(); state_add(STATE_GENPCBASE, "CURPC", m_pc).mask(01777).noshow(); state_add(VT61_AC, "AC", m_ac).formatstr("%03O"); state_add(VT61_MAR, "MAR", m_mar).formatstr("%06O"); state_add(VT61_MALO, "MALO", [this]() { return m_mar & 000377; }, [this](u8 data) { m_mar = (m_mar & 0177400) | data; } ).noshow(); state_add(VT61_MAHI, "MAHI", [this]() { return (m_mar & 0177400) >> 8; }, [this](u8 data) { m_mar = (m_mar & 000377) | (data << 8); } ).noshow(); state_add(VT61_MDR, "MDR", m_mdr).formatstr("%03O"); state_add(VT61_IR, "IR", m_ir).mask(6); for (int i = 0; i < 16; i++) state_add(VT61_R0 + i, string_format("R%d", i).c_str(), m_sp[i]).formatstr("%03O"); state_add(VT61_MISC, "MISC", m_misc_flags).formatstr("%03O"); state_add(VT61_MOD, "MOD", m_modem_flags).formatstr("%02O").mask(017); state_add(VT61_INTRC, "INTRC", m_intrpt_control).formatstr("%02O").mask(017); save_item(NAME(m_pc)); save_item(NAME(m_ac)); save_item(NAME(m_mar)); save_item(NAME(m_mdr)); save_item(NAME(m_ir)); save_item(NAME(m_sp)); save_item(NAME(m_misc_flags)); save_item(NAME(m_modem_flags)); save_item(NAME(m_intrpt_control)); } void vt61_cpu_device::device_reset() { m_pc = 0; m_misc_flags = 0; m_modem_flags = 0; m_intrpt_control = 0; } void vt61_cpu_device::execute_run() { debugger_instruction_hook(m_pc); m_icount = 0; } void vt61_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) const { switch (entry.index()) { case VT61_PC: str = string_format("%o:%03o", m_pc >> 8, m_pc & 0377); break; } }