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diff --git a/src/devices/bus/epson_qx/ide.cpp b/src/devices/bus/epson_qx/ide.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Brian Johnson
+/*******************************************************************
+ *
+ * IDE Compact Flash Adapter
+ *
+ * This implements a Compact flash adapter expansion card for QX-10
+ * systems. The boot disk necessary to support this card is listed below.
+ *
+ * Disk Image: https://github.com/brijohn/qx10/raw/master/diskimages/qx10cf.imd
+ * Board Design: https://github.com/brijohn/qx10/tree/master/kicad/cf_adapter
+ *
+ *******************************************************************/
+
+#include "emu.h"
+#include "ide.h"
+
+
+//**************************************************************************
+// EPSON IDE DEVICE
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(EPSON_QX_OPTION_IDE, bus::epson_qx::ide_device, "epson_qx_option_ide", "Epson QX-10 Compact Flash Adapter")
+
+namespace bus::epson_qx {
+
+static INPUT_PORTS_START( ide )
+ PORT_START("IOBASE")
+ PORT_CONFNAME(0xf0, 0xd0, "IO Base Address Selection")
+ PORT_CONFSETTING(0x80, "&80")
+ PORT_CONFSETTING(0x90, "&90")
+ PORT_CONFSETTING(0xa0, "&A0")
+ PORT_CONFSETTING(0xb0, "&B0")
+ PORT_CONFSETTING(0xc0, "&C0")
+ PORT_CONFSETTING(0xd0, "&D0")
+ PORT_CONFSETTING(0xe0, "&E0")
+ PORT_CONFSETTING(0xf0, "&F0")
+INPUT_PORTS_END
+
+//-------------------------------------------------
+// ide_device - constructor
+//-------------------------------------------------
+ide_device::ide_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ ide_hdd_device_base(mconfig, EPSON_QX_OPTION_IDE, tag, owner, clock),
+ device_option_expansion_interface(mconfig, *this),
+ m_iobase(*this, "IOBASE"),
+ m_installed(false)
+{
+}
+
+//-------------------------------------------------
+// device_input_ports - device-specific ports
+//-------------------------------------------------
+ioport_constructor ide_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( ide );
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+void ide_device::device_start()
+{
+ ide_hdd_device_base::device_start();
+
+ m_installed = false;
+
+ save_item(NAME(m_installed));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+void ide_device::device_reset()
+{
+ ide_hdd_device_base::device_reset();
+
+ if (!m_installed) {
+ address_space &space = m_bus->iospace();
+ offs_t iobase = m_iobase->read() & 0xf0;
+ space.install_device(iobase, iobase+0x0f, *this, &ide_device::map);
+ m_installed = true;
+ }
+}
+
+uint8_t ide_device::read(offs_t offset)
+{
+ if (offset < 8) {
+ return command_r(offset);
+ } else if (offset == 14 || offset == 15) {
+ return control_r(offset & 7);
+ }
+ return 0xff;
+}
+
+void ide_device::write(offs_t offset, uint8_t data)
+{
+ if (offset < 8) {
+ command_w(offset, data);
+ } else if (offset == 14) {
+ control_w(offset & 7, data);
+ }
+}
+
+void ide_device::map(address_map &map)
+{
+ map(0x00, 0x0f).rw(FUNC(ide_device::read), FUNC(ide_device::write));
+}
+
+} // namespace bus::epson_qx