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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#ifndef __MSX_SYSTEMFLAGS_H
#define __MSX_SYSTEMFLAGS_H
/*
Some MSX2+ and TurboR machines have a 'system flags' I/O port ($F4).
The value in this register is cleared on power up, but it keeps it's
value during a reset of the system.
*/
extern const device_type MSX_SYSTEMFLAGS;
#define MCFG_MSX_SYSTEMFLAGS_ADD(_tag, _initial_value) \
MCFG_DEVICE_ADD(_tag, MSX_SYSTEMFLAGS, 0) \
msx_systemflags_device::set_initial_value(*device, _initial_value);
class msx_systemflags_device : public device_t
{
public:
msx_systemflags_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// static configuration helpers
static void set_initial_value(device_t &device, uint8_t initial_value) { dynamic_cast<msx_systemflags_device &>(device).m_initial_value = initial_value; }
DECLARE_READ8_MEMBER(read);
DECLARE_WRITE8_MEMBER(write);
protected:
virtual void device_start() override;
private:
uint8_t m_initial_value;
uint8_t m_system_flags;
};
#endif
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