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// 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::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);
}
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