// license:BSD-3-Clause // copyright-holders:Olivier Galibert /*************************************************************************** m6504.c MOS Technology 6502, NMOS variant with reduced address bus ***************************************************************************/ #include "emu.h" #include "m6504.h" DEFINE_DEVICE_TYPE(M6504, m6504_device, "m6504", "MOS Technology M6504") m6504_device::m6504_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6502_device(mconfig, M6504, tag, owner, clock) { program_config.m_addr_width = 13; sprogram_config.m_addr_width = 13; } void m6504_device::device_start() { mintf = std::make_unique(); init(); } uint8_t m6504_device::mi_6504::read(uint16_t adr) { return program->read_byte(adr & 0x1fff); } uint8_t m6504_device::mi_6504::read_sync(uint16_t adr) { return scache->read_byte(adr & 0x1fff); } uint8_t m6504_device::mi_6504::read_arg(uint16_t adr) { return cache->read_byte(adr & 0x1fff); } void m6504_device::mi_6504::write(uint16_t adr, uint8_t val) { program->write_byte(adr & 0x1fff, val); }