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// license:BSD-3-Clause
// copyright-holders:AJR
/***********************************************************************************************************
ICD R-Time 8 (Atari 800 cartridge)
The circuitry in this clock cartridge is very simple, containing the RTC itself, oscillator and
battery, and a 74HCT138 to decode the $D5B8-$D5BF address range from the /CCTL and A7-A3 pins. No ROM
is included; the cartridge can be placed in the passthrough slot of the SpartaDOS X cartridge.
***********************************************************************************************************/
#include "emu.h"
#include "rtime8.h"
// device type definition
DEFINE_DEVICE_TYPE(A800_RTIME8, a800_rtime8_device, "a800_rtime8", "ICD R-Time 8")
//-------------------------------------------------
// a800_rtime8_device - constructor
//-------------------------------------------------
a800_rtime8_device::a800_rtime8_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, A800_RTIME8, tag, owner, clock)
, device_a800_cart_interface(mconfig, *this)
, m_rtc(*this, "rtc")
{
}
//-------------------------------------------------
// device_add_mconfig - configure subdevices
//-------------------------------------------------
void a800_rtime8_device::device_add_mconfig(machine_config &config)
{
M3002(config, m_rtc, 32.768_kHz_XTAL);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a800_rtime8_device::device_start()
{
}
//-------------------------------------------------
// read_d5xx - handle reads from $D500-$D5FF
//-------------------------------------------------
// TODO: 4-bit access, D7-D4 returns open bus
void a800_rtime8_device::cctl_map(address_map &map)
{
map(0xb8, 0xbf).lrw8(
NAME([this](offs_t offset) { return m_rtc->read() | 0xf0; }),
NAME([this](offs_t offset, u8 data) { m_rtc->write(data & 0x0f); })
);
}
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