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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"
DEFINE_DEVICE_TYPE(M6504, m6504_device, "m6504", "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_addrbus_width = 13;
sprogram_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_t m6504_device::mi_6504_normal::read(uint16_t adr)
{
return program->read_byte(adr & 0x1fff);
}
uint8_t m6504_device::mi_6504_normal::read_sync(uint16_t adr)
{
return sdirect->read_byte(adr & 0x1fff);
}
uint8_t m6504_device::mi_6504_normal::read_arg(uint16_t adr)
{
return direct->read_byte(adr & 0x1fff);
}
void m6504_device::mi_6504_normal::write(uint16_t adr, uint8_t val)
{
program->write_byte(adr & 0x1fff, val);
}
uint8_t m6504_device::mi_6504_nd::read_sync(uint16_t adr)
{
return sprogram->read_byte(adr & 0x1fff);
}
uint8_t m6504_device::mi_6504_nd::read_arg(uint16_t adr)
{
return program->read_byte(adr & 0x1fff);
}
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