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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/***************************************************************************
m6507.c
Mostek 6502, NMOS variant with reduced address bus
***************************************************************************/
#include "emu.h"
#include "m6507.h"
const device_type M6507 = &device_creator<m6507_device>;
m6507_device::m6507_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock) :
m6502_device(mconfig, M6507, "M6507", tag, owner, clock, "m6507", __FILE__)
{
program_config.m_addrbus_width = 13;
sprogram_config.m_addrbus_width = 13;
}
void m6507_device::device_start()
{
if(direct_disabled)
mintf = new mi_6507_nd;
else
mintf = new mi_6507_normal;
init();
}
UINT8 m6507_device::mi_6507_normal::read(UINT16 adr)
{
return program->read_byte(adr & 0x1fff);
}
UINT8 m6507_device::mi_6507_normal::read_sync(UINT16 adr)
{
return sdirect->read_byte(adr & 0x1fff);
}
UINT8 m6507_device::mi_6507_normal::read_arg(UINT16 adr)
{
return direct->read_byte(adr & 0x1fff);
}
void m6507_device::mi_6507_normal::write(UINT16 adr, UINT8 val)
{
program->write_byte(adr & 0x1fff, val);
}
UINT8 m6507_device::mi_6507_nd::read_sync(UINT16 adr)
{
return sprogram->read_byte(adr & 0x1fff);
}
UINT8 m6507_device::mi_6507_nd::read_arg(UINT16 adr)
{
return program->read_byte(adr & 0x1fff);
}
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