// license:BSD-3-Clause // copyright-holders:Olivier Galibert /*************************************************************************** m6504.c Mostek 6502, NMOS variant with reduced address bus ***************************************************************************/ #include "emu.h" #include "m6504.h" const device_type M6504 = &device_creator; m6504_device::m6504_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : m6502_device(mconfig, M6504, "M6504", tag, owner, clock, "m6504", __FILE__) { program_config.m_addrbus_width = 13; } void m6504_device::device_start() { if(direct_disabled) mintf = new mi_6504_nd; else mintf = new mi_6504_normal; init(); } UINT8 m6504_device::mi_6504_normal::read(UINT16 adr) { return program->read_byte(adr & 0x1fff); } UINT8 m6504_device::mi_6504_normal::read_direct(UINT16 adr) { return direct->read_raw_byte(adr & 0x1fff); } UINT8 m6504_device::mi_6504_normal::read_decrypted(UINT16 adr) { return direct->read_decrypted_byte(adr & 0x1fff); } void m6504_device::mi_6504_normal::write(UINT16 adr, UINT8 val) { program->write_byte(adr & 0x1fff, val); } UINT8 m6504_device::mi_6504_nd::read_direct(UINT16 adr) { return read(adr); } UINT8 m6504_device::mi_6504_nd::read_decrypted(UINT16 adr) { return read(adr); }