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Diffstat (limited to 'src/devices/bus/bbc/rom/rtc.cpp')
-rw-r--r--src/devices/bus/bbc/rom/rtc.cpp124
1 files changed, 124 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/rom/rtc.cpp b/src/devices/bus/bbc/rom/rtc.cpp
new file mode 100644
index 00000000000..7d73c24b53e
--- /dev/null
+++ b/src/devices/bus/bbc/rom/rtc.cpp
@@ -0,0 +1,124 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/***************************************************************************
+
+ Solidisk Real Time Clock
+
+ http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Solidisk_RTC.html
+
+ PMS Genie Watch (RTC for the BBC)
+
+***************************************************************************/
+
+#include "emu.h"
+#include "rtc.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(BBC_STLRTC, bbc_stlrtc_device, "bbc_stlrtc", "Solidisk Real Time Clock")
+DEFINE_DEVICE_TYPE(BBC_PMSRTC, bbc_pmsrtc_device, "bbc_pmsrtc", "PMS Genie Real Time Clock")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bbc_stlrtc_device::device_add_mconfig(machine_config &config)
+{
+ MC146818(config, m_rtc, 32.768_kHz_XTAL); // TODO: verify clock
+}
+
+void bbc_pmsrtc_device::device_add_mconfig(machine_config &config)
+{
+ /* Dallas DS1216 SmartWatch RAM */
+ DS1315(config, m_rtc, 0);
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// bbc_stlrtc_device - constructor
+//-------------------------------------------------
+
+bbc_stlrtc_device::bbc_stlrtc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, BBC_STLRTC, tag, owner, clock)
+ , device_bbc_rom_interface(mconfig, *this)
+ , m_rtc(*this, "rtc")
+{
+}
+
+bbc_pmsrtc_device::bbc_pmsrtc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, BBC_PMSRTC, tag, owner, clock)
+ , device_bbc_rom_interface(mconfig, *this)
+ , m_rtc(*this, "rtc")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_stlrtc_device::device_start()
+{
+}
+
+void bbc_pmsrtc_device::device_start()
+{
+}
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+uint8_t bbc_stlrtc_device::read(offs_t offset)
+{
+ uint8_t data = get_rom_base()[offset & 0x3fff];
+
+ switch (offset & 0x3fc0)
+ {
+ case 0x3e00:
+ data = m_rtc->read(1);
+ break;
+ case 0x3e40:
+ if (!machine().side_effects_disabled())
+ m_rtc->write(0, data);
+ break;
+ case 0x3e80:
+ case 0x3ec0:
+ data = m_rtc->read(0);
+ break;
+ case 0x3f00:
+ case 0x3f40:
+ case 0x3f80:
+ case 0x3fc0:
+ if (!machine().side_effects_disabled())
+ m_rtc->write(1, data);
+ break;
+ }
+ return data;
+}
+
+uint8_t bbc_pmsrtc_device::read(offs_t offset)
+{
+ uint8_t data = get_rom_base()[offset & 0x1fff];
+
+ switch (offset)
+ {
+ case 0x00:
+ data |= m_rtc->read_0();
+ break;
+ case 0x01:
+ data |= m_rtc->read_1();
+ break;
+ case 0x04:
+ if (m_rtc->chip_enable())
+ data = m_rtc->read_data() & 0x01;
+ break;
+ }
+ return data;
+}