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-rw-r--r--src/devices/bus/spectrum/uslot.cpp116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/devices/bus/spectrum/uslot.cpp b/src/devices/bus/spectrum/uslot.cpp
new file mode 100644
index 00000000000..315f768669e
--- /dev/null
+++ b/src/devices/bus/spectrum/uslot.cpp
@@ -0,0 +1,116 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Currah MicroSlot
+
+**********************************************************************/
+
+#include "emu.h"
+#include "uslot.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(SPECTRUM_USLOT, spectrum_uslot_device, "spectrum_uslot", "Spectrum Currah \xC2\xB5Slot")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+MACHINE_CONFIG_MEMBER(spectrum_uslot_device::device_add_mconfig)
+ /* passthru */
+ MCFG_SPECTRUM_EXPANSION_SLOT_ADD("exp1", spectrum_expansion_devices, nullptr)
+ MCFG_SPECTRUM_EXPANSION_SLOT_IRQ_HANDLER(DEVWRITELINE(DEVICE_SELF_OWNER, spectrum_expansion_slot_device, irq_w))
+ MCFG_SPECTRUM_EXPANSION_SLOT_NMI_HANDLER(DEVWRITELINE(DEVICE_SELF_OWNER, spectrum_expansion_slot_device, nmi_w))
+
+ MCFG_SPECTRUM_EXPANSION_SLOT_ADD("exp2", spectrum_expansion_devices, nullptr)
+ MCFG_SPECTRUM_EXPANSION_SLOT_IRQ_HANDLER(DEVWRITELINE(DEVICE_SELF_OWNER, spectrum_expansion_slot_device, irq_w))
+ MCFG_SPECTRUM_EXPANSION_SLOT_NMI_HANDLER(DEVWRITELINE(DEVICE_SELF_OWNER, spectrum_expansion_slot_device, nmi_w))
+MACHINE_CONFIG_END
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// spectrum_uslot_device - constructor
+//-------------------------------------------------
+
+spectrum_uslot_device::spectrum_uslot_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, SPECTRUM_USLOT, tag, owner, clock)
+ , device_spectrum_expansion_interface(mconfig, *this)
+ , m_exp1(*this, "exp1")
+ , m_exp2(*this, "exp2")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void spectrum_uslot_device::device_start()
+{
+ m_slot = dynamic_cast<spectrum_expansion_slot_device *>(owner());
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void spectrum_uslot_device::device_reset()
+{
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+READ_LINE_MEMBER(spectrum_uslot_device::romcs)
+{
+ return m_exp1->romcs() | m_exp2->romcs();
+}
+
+
+READ8_MEMBER(spectrum_uslot_device::mreq_r)
+{
+ uint8_t temp;
+ uint8_t data = 0xff;
+
+ temp = m_exp1->mreq_r(space, offset);
+ if (m_exp1->romcs())
+ data &= temp;
+
+ temp = m_exp2->mreq_r(space, offset);
+ if (m_exp2->romcs())
+ data &= temp;
+
+ return data;
+}
+
+WRITE8_MEMBER(spectrum_uslot_device::mreq_w)
+{
+ if (m_exp1->romcs())
+ m_exp1->mreq_w(space, offset, data);
+
+ if (m_exp2->romcs())
+ m_exp2->mreq_w(space, offset, data);
+}
+
+READ8_MEMBER(spectrum_uslot_device::port_fe_r)
+{
+ uint8_t data = 0xff;
+
+ if (m_exp1->romcs())
+ data &= m_exp1->port_fe_r(space, offset);
+
+ if (m_exp2->romcs())
+ data &= m_exp2->port_fe_r(space, offset);
+
+ return data;
+} \ No newline at end of file