// license:BSD-3-Clause // copyright-holders:hap /* Rockwell A5000 MCU */ #include "emu.h" #include "a5000.h" #include "rw5000d.h" DEFINE_DEVICE_TYPE(A5000, a5000_cpu_device, "a5000", "Rockwell A5000") // constructor a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data) : b5000_cpu_device(mconfig, type, tag, owner, clock, prgwidth, program, datawidth, data) { } a5000_cpu_device::a5000_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : a5000_cpu_device(mconfig, A5000, tag, owner, clock, 9, address_map_constructor(FUNC(a5000_cpu_device::program_448x8), this), 6, address_map_constructor(FUNC(a5000_cpu_device::data_45x4), this)) { } // disasm std::unique_ptr a5000_cpu_device::create_disassembler() { return std::make_unique(); } //------------------------------------------------- // execute //------------------------------------------------- void a5000_cpu_device::execute_one() { switch (m_op) { case 0x02: op_illegal(); break; case 0x03: op_tkb(); break; case 0x76: m_mtd_step = 1; break; case 0x77: op_atb(); break; // rest is same as B5000 default: b5000_cpu_device::execute_one(); break; } } //------------------------------------------------- // changed opcodes (no need for separate file) //------------------------------------------------- void a5000_cpu_device::op_mtd_step() { assert(m_mtd_step > 0); // MTD: load strobe + segments (multi step) switch (m_mtd_step) { // step 1: disable strobe and segment drivers case 1: m_write_str(0); op_kseg(); break; // step 2: load strobe from Bl case 2: m_write_str(1 << m_prev_bl); break; // step 4: load segment drivers case 4: seg_w(m_seg | decode_digit(m_prev3_c << 4 | ram_r())); m_mtd_step = 0; return; default: break; } m_mtd_step++; }