diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 3b1a1560b25f5..0108aa5b147ee 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -1896,6 +1896,8 @@ if (BUSES["ISA"]~=null) then
 		MAME_DIR .. "src/devices/bus/isa/xsu_cards.h",
 		MAME_DIR .. "src/devices/bus/isa/xtide.cpp",
 		MAME_DIR .. "src/devices/bus/isa/xtide.h",
+		MAME_DIR .. "src/devices/bus/isa/zxbus_adapter.cpp",
+		MAME_DIR .. "src/devices/bus/isa/zxbus_adapter.h",
 	}
 end
 
diff --git a/src/devices/bus/isa/isa_cards.cpp b/src/devices/bus/isa/isa_cards.cpp
index 786c9bf10107d..50db577cbfcc1 100644
--- a/src/devices/bus/isa/isa_cards.cpp
+++ b/src/devices/bus/isa/isa_cards.cpp
@@ -90,6 +90,7 @@
 #include "finalchs.h"
 #include "hpblp.h"
 #include "opus100pm.h"
+#include "zxbus_adapter.h"
 
 
 void pc_isa8_cards(device_slot_interface &device)
@@ -148,6 +149,7 @@ void pc_isa8_cards(device_slot_interface &device)
 	device.option_add("acb2072", ACB2072);
 	device.option_add("3xtwin", ISA8_3XTWIN);
 	device.option_add("opus108pm", ISA8_OPUS108PM);
+	device.option_add("zxbus_adapter", ISA8_ZXBUS);
 }
 
 void pc_isa16_cards(device_slot_interface &device)
diff --git a/src/devices/bus/isa/zxbus_adapter.cpp b/src/devices/bus/isa/zxbus_adapter.cpp
new file mode 100644
index 0000000000000..c65ea81bc74af
--- /dev/null
+++ b/src/devices/bus/isa/zxbus_adapter.cpp
@@ -0,0 +1,28 @@
+// license:BSD-3-Clause
+// copyright-holders:Andrei I. Holub
+#include "emu.h"
+#include "zxbus_adapter.h"
+
+DEFINE_DEVICE_TYPE(ISA8_ZXBUS, zxbus_adapter_device, "zxbus_adapter", "ISA8 to ZXBUS Adapter")
+
+zxbus_adapter_device::zxbus_adapter_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+	: device_t(mconfig, ISA8_ZXBUS, tag, owner, clock)
+	, device_isa8_card_interface(mconfig, *this)
+	, m_isa_io_view(*this, "isa_io_view")
+	, m_zxbus(*this, "zxbus")
+{
+}
+
+void zxbus_adapter_device::device_start()
+{
+	set_isa_device();
+	m_isa->space(isa8_device::AS_ISA_IO).install_view(0x0000, 0xffff, m_isa_io_view);
+	m_zxbus->set_io_space(m_isa_io_view[0], m_isa_io_view[0]);
+	m_isa_io_view.select(0);
+}
+
+void zxbus_adapter_device::device_add_mconfig(machine_config &config)
+{
+	ZXBUS(config, m_zxbus, 0);
+	ZXBUS_SLOT(config, "card", 0, m_zxbus, zxbus_cards, nullptr);
+}
diff --git a/src/devices/bus/isa/zxbus_adapter.h b/src/devices/bus/isa/zxbus_adapter.h
new file mode 100644
index 0000000000000..00fd353e75af7
--- /dev/null
+++ b/src/devices/bus/isa/zxbus_adapter.h
@@ -0,0 +1,27 @@
+// license:BSD-3-Clause
+// copyright-holders:Andrei I. Holub
+#ifndef MAME_BUS_ISA_ZXBUS_ADAPTER_H
+#define MAME_BUS_ISA_ZXBUS_ADAPTER_H
+
+#include "isa.h"
+
+#include "bus/spectrum/zxbus.h"
+
+class zxbus_adapter_device: public device_t, public device_isa8_card_interface
+{
+public:
+	zxbus_adapter_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+	virtual void device_start() override ATTR_COLD;
+	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+	memory_view m_isa_io_view;
+	required_device<zxbus_device> m_zxbus;
+
+};
+
+DECLARE_DEVICE_TYPE(ISA8_ZXBUS, zxbus_adapter_device)
+
+#endif // MAME_BUS_ISA_ZXBUS_ADAPTER_H
diff --git a/src/devices/bus/spectrum/nemoide.cpp b/src/devices/bus/spectrum/nemoide.cpp
index 75c83bc31fe78..4aef90df5540f 100644
--- a/src/devices/bus/spectrum/nemoide.cpp
+++ b/src/devices/bus/spectrum/nemoide.cpp
@@ -21,12 +21,13 @@ class nemoide_device : public device_t, public device_zxbus_card_interface
 		, m_ata(*this, "ata")
 	{ }
 
+	virtual void io_map(address_map &map) override ATTR_COLD;
+
 protected:
 	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
 	virtual void device_start() override ATTR_COLD;
 
 private:
-	void map_io(address_map &map) ATTR_COLD;
 
 	u8 ata_r(offs_t offset);
 	void ata_w(offs_t offset, u8 data);
@@ -51,7 +52,7 @@ void nemoide_device::ata_w(offs_t offset, u8 data)
 	m_ata->cs0_w((offset >> 5) & 7, ata_data);
 }
 
-void nemoide_device::map_io(address_map &map)
+void nemoide_device::io_map(address_map &map)
 {
 	map(0x0011, 0x0011).mirror(0xff00).lrw8(NAME([this]() { return m_ata_data_latch; })
 		, NAME([this](offs_t offset, u8 data) { m_ata_data_latch = data; }));
@@ -74,8 +75,6 @@ void nemoide_device::device_add_mconfig(machine_config &config)
 void nemoide_device::device_start()
 {
 	save_item(NAME(m_ata_data_latch));
-
-	m_zxbus->install_device(0x0000, 0xffff, *this, &nemoide_device::map_io);
 }
 
 } // anonymous namespace
diff --git a/src/devices/bus/spectrum/neogs.cpp b/src/devices/bus/spectrum/neogs.cpp
index 156c2e2895cc0..32fc939b5096d 100644
--- a/src/devices/bus/spectrum/neogs.cpp
+++ b/src/devices/bus/spectrum/neogs.cpp
@@ -85,6 +85,8 @@ class neogs_device : public device_t, public device_zxbus_card_interface
 		, m_neogs_led(*this, "neogs_led")
 	{ }
 
+	virtual void io_map(address_map &map) override ATTR_COLD;
+
 protected:
 	// device_t implementation
 	virtual void device_start() override ATTR_COLD;
@@ -92,8 +94,6 @@ class neogs_device : public device_t, public device_zxbus_card_interface
 	virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
 	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
 
-	void neogsmap(address_map &map) ATTR_COLD;
-
 	INTERRUPT_GEN_MEMBER(irq0_line_assert);
 
 	void map_memory(address_map &map) ATTR_COLD;
@@ -438,7 +438,7 @@ const tiny_rom_entry *neogs_device::device_rom_region() const
 	return ROM_NAME( neogs );
 }
 
-void neogs_device::neogsmap(address_map &map)
+void neogs_device::io_map(address_map &map)
 {
 	map(0x00bb, 0x00bb).mirror(0xff00).rw(FUNC(neogs_device::neogs_status_r), FUNC(neogs_device::neogs_command_w));
 	map(0x00b3, 0x00b3).mirror(0xff00).rw(FUNC(neogs_device::neogs_data_r), FUNC(neogs_device::neogs_data_w));
@@ -466,8 +466,6 @@ void neogs_device::device_start()
 				}
 			});
 
-	m_zxbus->install_device(0x0000, 0xffff, *this, &neogs_device::neogsmap);
-
 	m_neogs_led.resolve();
 
 	save_item(NAME(m_data_in));
diff --git a/src/devices/bus/spectrum/smuc.cpp b/src/devices/bus/spectrum/smuc.cpp
index d2ac18278a449..f44cb7a6106d4 100644
--- a/src/devices/bus/spectrum/smuc.cpp
+++ b/src/devices/bus/spectrum/smuc.cpp
@@ -25,7 +25,7 @@ class smuc_device : public device_t, public device_zxbus_card_interface
 		, m_ata(*this, "ata")
 	{ }
 
-	virtual void map_shadow_io(address_map &map) override ATTR_COLD;
+	virtual void shadow_io_map(address_map &map) override ATTR_COLD;
 
 protected:
 	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
@@ -33,8 +33,6 @@ class smuc_device : public device_t, public device_zxbus_card_interface
 	virtual void device_reset() override ATTR_COLD;
 
 private:
-	void map_io(address_map &map) ATTR_COLD {}
-
 	void port_ffba_w(offs_t offset, u8 data);
 	u8 ata_r(offs_t offset);
 	void ata_w(offs_t offset, u8 data);
@@ -83,7 +81,7 @@ void smuc_device::ata_w(offs_t offset, u8 data)
 		m_ata->cs0_w(ata_offset, ata_data);
 }
 
-void smuc_device::map_shadow_io(address_map &map)
+void smuc_device::shadow_io_map(address_map &map)
 {
 	map(0x18a2, 0x18a2).mirror(0x4718) //     5fba | 0x011xxx101xx010 | Version: 2
 		.lr8(NAME([]() { return 0x40; }));
@@ -125,8 +123,6 @@ void smuc_device::device_start()
 	save_item(NAME(m_port_7fba_data));
 	save_item(NAME(m_port_ffba_data));
 	save_item(NAME(m_ide_hi));
-
-	m_zxbus->install_device(0x0000, 0xffff, *this, &smuc_device::map_io);
 }
 
 void smuc_device::device_reset()
diff --git a/src/devices/bus/spectrum/zxbus.cpp b/src/devices/bus/spectrum/zxbus.cpp
index ac5e83436ddac..67beb56fb3752 100644
--- a/src/devices/bus/spectrum/zxbus.cpp
+++ b/src/devices/bus/spectrum/zxbus.cpp
@@ -40,8 +40,8 @@ zxbus_device::zxbus_device(const machine_config &mconfig, const char *tag, devic
 
 zxbus_device::zxbus_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
 	: device_t(mconfig, type, tag, owner, clock)
-	, m_iospace(*this, finder_base::DUMMY_TAG, -1)
-	, m_shadow_io_view(nullptr)
+	, m_io(nullptr)
+	, m_shadow_io(nullptr)
 {
 }
 
@@ -52,10 +52,14 @@ void zxbus_device::device_start()
 void zxbus_device::add_slot(zxbus_slot_device &slot)
 {
 	m_slot_list.push_front(&slot);
-	if (m_shadow_io_view)
+
+	device_zxbus_card_interface *card = slot.get_card_device();
+	if (card)
 	{
-		device_zxbus_card_interface *dev = slot.get_card_device();
-		(*m_shadow_io_view).install_device(0x0000, 0xffff, *dev, &device_zxbus_card_interface::map_shadow_io);
+		if (m_io)
+			m_io->install_device(0x0000, 0xffff, *card, &device_zxbus_card_interface::io_map);
+		if (m_shadow_io)
+			m_shadow_io->install_device(0x0000, 0xffff, *card, &device_zxbus_card_interface::shadow_io_map);
 	}
 }
 
@@ -65,11 +69,6 @@ device_zxbus_card_interface::device_zxbus_card_interface(const machine_config &m
 {
 }
 
-void zxbus_device::install_shadow_io(memory_view::memory_view_entry &io_view)
-{
-	m_shadow_io_view = &io_view;
-}
-
 void device_zxbus_card_interface::interface_pre_start()
 {
 	if (!m_zxbus)
diff --git a/src/devices/bus/spectrum/zxbus.h b/src/devices/bus/spectrum/zxbus.h
index ddaa176cf9e54..5caa0f023ef07 100644
--- a/src/devices/bus/spectrum/zxbus.h
+++ b/src/devices/bus/spectrum/zxbus.h
@@ -85,14 +85,13 @@ class zxbus_device : public device_t
 public:
 	zxbus_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
 
-	template <typename T> void set_iospace(T &&tag, int spacenum) { m_iospace.set_tag(std::forward<T>(tag), spacenum); }
-	template<typename T> void install_device(offs_t addrstart, offs_t addrend, T &device, void (T::*map)(class address_map &map), u64 unitmask = ~u64(0))
+	void set_io_space(address_space_installer &io, address_space_installer &shadow_io)
 	{
-		m_iospace->install_device(addrstart, addrend, device, map, unitmask);
+		m_io = &io;
+		m_shadow_io = &shadow_io;
 	}
 
 	void add_slot(zxbus_slot_device &slot);
-	void install_shadow_io(memory_view::memory_view_entry &io_view);
 
 protected:
 	zxbus_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
@@ -100,8 +99,8 @@ class zxbus_device : public device_t
 	virtual void device_start() override ATTR_COLD;
 
 private:
-	required_address_space m_iospace;
-	memory_view::memory_view_entry *m_shadow_io_view;
+	address_space_installer *m_io;
+	address_space_installer *m_shadow_io;
 
 	std::forward_list<zxbus_slot_device *> m_slot_list;
 };
@@ -114,7 +113,8 @@ class device_zxbus_card_interface : public device_interface
 	friend class zxbus_slot_device;
 
 public:
-	virtual void map_shadow_io(address_map &map) ATTR_COLD {}
+	virtual void io_map(address_map &map) ATTR_COLD {}
+	virtual void shadow_io_map(address_map &map) ATTR_COLD {}
 
 protected:
 	device_zxbus_card_interface(const machine_config &mconfig, device_t &device);
diff --git a/src/mame/sinclair/pentevo.cpp b/src/mame/sinclair/pentevo.cpp
index c1ac00173682c..023172734162d 100644
--- a/src/mame/sinclair/pentevo.cpp
+++ b/src/mame/sinclair/pentevo.cpp
@@ -158,7 +158,7 @@ void pentevo_state::atm_update_io()
 {
 	if (BIT(m_port_bf_data, 0) || is_dos_active())
 	{
-		m_io_view.select(0);
+		m_io_view.select(1);
 		if (m_beta_drive_selected && m_beta_drive_virtual == m_beta_drive_selected)
 			m_io_dos_view.disable();
 		else
@@ -168,7 +168,7 @@ void pentevo_state::atm_update_io()
 	}
 	else
 	{
-		m_io_view.disable();
+		m_io_view.select(0);
 		if (BIT(m_port_eff7_data, 7))
 			m_glukrs->enable();
 		else
@@ -623,28 +623,32 @@ void pentevo_state::pentevo_io(address_map &map)
 	map(0xffdf, 0xffdf).lr8(NAME([this]() -> u8 { return ~m_io_mouse[1]->read(); }));
 	map(0x001f, 0x001f).mirror(0xff00).lr8(NAME([]() -> u8 { return 0x00; })); // TODO Kepmston Joystick
 
-	// PORTS: Shadow
 	map(0x0000, 0xffff).view(m_io_view);
-	m_io_view[0](0x0000, 0xffff).view(m_io_dos_view);
+	m_io_view[0];
+
+	// PORTS: Shadow
+	m_io_view[1](0x0000, 0xffff).view(m_io_dos_view);
 	m_io_dos_view[0](0x001f, 0x001f).mirror(0xff00).rw(m_beta, FUNC(beta_disk_device::status_r), FUNC(beta_disk_device::command_w));
 	m_io_dos_view[0](0x003f, 0x003f).mirror(0xff00).rw(m_beta, FUNC(beta_disk_device::track_r), FUNC(beta_disk_device::track_w));
 	m_io_dos_view[0](0x005f, 0x005f).mirror(0xff00).rw(m_beta, FUNC(beta_disk_device::sector_r), FUNC(beta_disk_device::sector_w));
 	m_io_dos_view[0](0x007f, 0x007f).mirror(0xff00).rw(m_beta, FUNC(beta_disk_device::data_r), FUNC(beta_disk_device::data_w));
 	m_io_dos_view[0](0x00ff, 0x00ff).select(0xff00).r(m_beta, FUNC(beta_disk_device::state_r));
 
-	m_io_view[0](0x00ff, 0x00ff).select(0xff00).w(FUNC(pentevo_state::atm_port_ff_w));
-	m_io_view[0](0x0077, 0x0077).select(0xff00).lr8(NAME([]() { return 0xff; })).w(FUNC(pentevo_state::atm_port_77_w));
-	m_io_view[0](0x3ff7, 0x3ff7).select(0xc000).w(FUNC(pentevo_state::atm_port_f7_w));      // ATM
-	m_io_view[0](0x37f7, 0x37f7).select(0xc000).w(FUNC(pentevo_state::pentevo_port_7f7_w)); // PENTEVO
-	m_io_view[0](0x3bf7, 0x3bf7).select(0xc000).w(FUNC(pentevo_state::pentevo_port_bf7_w)); // RO
+	m_io_view[1](0x00ff, 0x00ff).select(0xff00).w(FUNC(pentevo_state::atm_port_ff_w));
+	m_io_view[1](0x0077, 0x0077).select(0xff00).lr8(NAME([]() { return 0xff; })).w(FUNC(pentevo_state::atm_port_77_w));
+	m_io_view[1](0x3ff7, 0x3ff7).select(0xc000).w(FUNC(pentevo_state::atm_port_f7_w));      // ATM
+	m_io_view[1](0x37f7, 0x37f7).select(0xc000).w(FUNC(pentevo_state::pentevo_port_7f7_w)); // PENTEVO
+	m_io_view[1](0x3bf7, 0x3bf7).select(0xc000).w(FUNC(pentevo_state::pentevo_port_bf7_w)); // RO
 
 	// SPI
-	m_io_view[0](0x0057, 0x0057).select(0xff00)
+	m_io_view[1](0x0057, 0x0057).select(0xff00)
 		.lw8(NAME([this](offs_t offset, u8 data) { if (BIT(offset, 15)) spi_port_77_w(offset, data); else spi_port_57_w(offset, data); }));
 
 	// Gluk
-	m_io_view[0](0xdef7, 0xdef7).lw8(NAME([this](offs_t offset, u8 data) { m_glukrs->address_w(data); } ));
-	m_io_view[0](0xbef7, 0xbef7).rw(FUNC(pentevo_state::gluk_data_r), FUNC(pentevo_state::gluk_data_w));
+	m_io_view[1](0xdef7, 0xdef7).lw8(NAME([this](offs_t offset, u8 data) { m_glukrs->address_w(data); } ));
+	m_io_view[1](0xbef7, 0xbef7).rw(FUNC(pentevo_state::gluk_data_r), FUNC(pentevo_state::gluk_data_w));
+
+	subdevice<zxbus_device>("zxbus")->set_io_space(m_io_view[0], m_io_view[1]);
 }
 
 void pentevo_state::init_mem_write()
@@ -786,8 +790,7 @@ void pentevo_state::pentevo(machine_config &config)
 	AT_KEYB(config, m_keyboard, pc_keyboard_device::KEYBOARD_TYPE::AT, 3);
 
 	zxbus_device &zxbus(ZXBUS(config, "zxbus", 0));
-	zxbus.set_iospace("maincpu", AS_IO);
-	ZXBUS_SLOT(config, "zxbus1", 0, "zxbus", zxbus_cards, nullptr);
+	ZXBUS_SLOT(config, "zxbus1", 0, zxbus, zxbus_cards, nullptr);
 }
 
 
diff --git a/src/mame/sinclair/scorpion.cpp b/src/mame/sinclair/scorpion.cpp
index 97f37fdaa2d95..56f322cdddaa5 100644
--- a/src/mame/sinclair/scorpion.cpp
+++ b/src/mame/sinclair/scorpion.cpp
@@ -243,10 +243,7 @@ void scorpion_state::update_io(bool dos_enable)
 
 	scorpion_update_memory();
 
-	if (dos())
-		m_io_shadow_view.select(0);
-	else
-		m_io_shadow_view.disable();
+	m_io_shadow_view.select(dos() ?  1 : 0);
 }
 
 u8 scorpion_state::port_ff_r()
@@ -337,10 +334,7 @@ void scorpion_state::scorpion_mem(address_map &map)
 void scorpion_state::scorpion_io(address_map &map)
 {
 	map.unmap_value_high();
-	map(0x0022, 0x0022).select(0xffdc) // FE | xxxxxxxxxx1xxx10
-		.rw(FUNC(scorpion_state::spectrum_ula_r), FUNC(scorpion_state::spectrum_ula_w));
-	map(0x0023, 0x0023).mirror(0xffdc) // FF | xxxxxxxxxx1xxx11
-		.r(FUNC(scorpion_state::port_ff_r));
+
 	map(0x0021, 0x0021).mirror(0x3fdc) // 1FFD | 00xxxxxxxx1xxx01
 		.w(FUNC(scorpion_state::port_1ffd_w));
 	map(0x4021, 0x4021).mirror(0x3fdc) // 7FFD | 01xxxxxxxx1xxx01
@@ -351,23 +345,28 @@ void scorpion_state::scorpion_io(address_map &map)
 	map(0xe021, 0xe021).mirror(0x1fdc) // FFFD | 111xxxxxxx1xxx01
 		.lr8(NAME([this]() { return m_ay[m_ay_selected]->data_r(); })).w(FUNC(scorpion_state::ay_address_w));
 
-	// Mouse
-	map(0xfadf, 0xfadf).lr8(NAME([this]() -> u8 { return 0x80 | (m_io_mouse[2]->read() & 0x07); }));
-	map(0xfbdf, 0xfbdf).lr8(NAME([this]() -> u8 { return m_io_mouse[0]->read(); }));
-	map(0xffdf, 0xffdf).lr8(NAME([this]() -> u8 { return ~m_io_mouse[1]->read(); }));
-	map(0x0003, 0x0003) // 1F | xxxxxxxx0x0xxx11
+	map(0x0000, 0xffff).view(m_io_shadow_view);
+
+	// !Shadow
+	m_io_shadow_view[0](0x0022, 0x0022).select(0xffdc) // FE | xxxxxxxxxx1xxx10
+		.rw(FUNC(scorpion_state::spectrum_ula_r), FUNC(scorpion_state::spectrum_ula_w));
+	m_io_shadow_view[0](0x0023, 0x0023).mirror(0xffdc) // FF | xxxxxxxxxx1xxx11
+		.r(FUNC(scorpion_state::port_ff_r));
+	m_io_shadow_view[0](0xfadf, 0xfadf).lr8(NAME([this]() -> u8 { return 0x80 | (m_io_mouse[2]->read() & 0x07); }));
+	m_io_shadow_view[0](0xfbdf, 0xfbdf).lr8(NAME([this]() -> u8 { return m_io_mouse[0]->read(); }));
+	m_io_shadow_view[0](0xffdf, 0xffdf).lr8(NAME([this]() -> u8 { return ~m_io_mouse[1]->read(); }));
+	m_io_shadow_view[0](0x0003, 0x0003) // 1F | xxxxxxxx0x0xxx11
 		.select(0xff5c).lr8(NAME([this]() -> u8 { return (m_beta->state_r() & 0xc0) | 0x00; })); // TODO Kepmston Joystick
 
 	// Shadow
 	// DOS + xxxxxxxx0nnxxx11
-	map(0x0000, 0xffff).view(m_io_shadow_view);
-	m_io_shadow_view[0](0x0003, 0x0003).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::status_r), FUNC(beta_disk_device::command_w));
-	m_io_shadow_view[0](0x0023, 0x0023).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::track_r), FUNC(beta_disk_device::track_w));
-	m_io_shadow_view[0](0x0043, 0x0043).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::sector_r), FUNC(beta_disk_device::sector_w));
-	m_io_shadow_view[0](0x0063, 0x0063).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::data_r), FUNC(beta_disk_device::data_w));
-	m_io_shadow_view[0](0x00e3, 0x00e3).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::state_r), FUNC(beta_disk_device::param_w));
+	m_io_shadow_view[1](0x0003, 0x0003).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::status_r), FUNC(beta_disk_device::command_w));
+	m_io_shadow_view[1](0x0023, 0x0023).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::track_r), FUNC(beta_disk_device::track_w));
+	m_io_shadow_view[1](0x0043, 0x0043).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::sector_r), FUNC(beta_disk_device::sector_w));
+	m_io_shadow_view[1](0x0063, 0x0063).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::data_r), FUNC(beta_disk_device::data_w));
+	m_io_shadow_view[1](0x00e3, 0x00e3).mirror(0xff1c).rw(m_beta, FUNC(beta_disk_device::state_r), FUNC(beta_disk_device::param_w));
 
-	subdevice<zxbus_device>("zxbus")->install_shadow_io(m_io_shadow_view[0]);
+	subdevice<zxbus_device>("zxbus")->set_io_space(m_io_shadow_view[0], m_io_shadow_view[1]);
 }
 
 void scorpion_state::scorpion_switch(address_map &map)
@@ -531,9 +530,8 @@ void scorpion_state::scorpion(machine_config &config)
 	config.device_remove("exp");
 
 	zxbus_device &zxbus(ZXBUS(config, "zxbus", 0));
-	zxbus.set_iospace("maincpu", AS_IO);
-	ZXBUS_SLOT(config, "zxbus:1", 0, "zxbus", zxbus_gmx_cards, nullptr);
-	ZXBUS_SLOT(config, "zxbus:2", 0, "zxbus", zxbus_gmx_cards, nullptr);
+	ZXBUS_SLOT(config, "zxbus:1", 0, zxbus, zxbus_gmx_cards, nullptr);
+	ZXBUS_SLOT(config, "zxbus:2", 0, zxbus, zxbus_gmx_cards, nullptr);
 }
 
 void scorpion_state::profi(machine_config &config)
diff --git a/src/mame/sinclair/specnext.cpp b/src/mame/sinclair/specnext.cpp
index c34a162849456..fa9a025c51540 100644
--- a/src/mame/sinclair/specnext.cpp
+++ b/src/mame/sinclair/specnext.cpp
@@ -68,6 +68,7 @@ class specnext_state : public spectrum_128_state
 	specnext_state(const machine_config &mconfig, device_type type, const char *tag)
 		: spectrum_128_state(mconfig, type, tag)
 		, m_maincpu(*this, "maincpu")
+		, m_io_shadow_view(*this, "io_shadow_view")
 		, m_bank_boot_rom(*this, "bootrom")
 		, m_bank_ram(*this, "bank_ram%u", 0U)
 		, m_view0(*this, "mem_view0")
@@ -289,6 +290,7 @@ class specnext_state : public spectrum_128_state
 	memory_access<8, 0, 0, ENDIANNESS_LITTLE>::specific m_next_regs;
 	memory_access<16, 0, 0, ENDIANNESS_LITTLE>::specific m_program;
 	memory_access<16, 0, 0, ENDIANNESS_LITTLE>::specific m_io;
+	memory_view m_io_shadow_view;
 	memory_bank_creator m_bank_boot_rom;
 	memory_bank_array_creator<8> m_bank_ram;
 	memory_view m_view0, m_view1, m_view2, m_view3, m_view4, m_view5, m_view6, m_view7;
@@ -2755,6 +2757,10 @@ void specnext_state::map_io(address_map &map)
 		if (m_nr_08_dac_en)
 			m_dac[3]->data_w(data);
 	}));
+
+	map(0x0000, 0xffff).view(m_io_shadow_view);
+	subdevice<zxbus_device>("zxbus")->set_io_space(m_io_shadow_view[0], m_io_shadow_view[1]);
+	m_io_shadow_view.select(0);
 }
 
 void specnext_state::map_regs(address_map &map)
@@ -3493,8 +3499,7 @@ void specnext_state::tbblue(machine_config &config)
 	SPECNEXT_DIVMMC(config, m_divmmc, 0);
 
 	zxbus_device &zxbus(ZXBUS(config, "zxbus", 0));
-	zxbus.set_iospace("maincpu", AS_IO);
-	ZXBUS_SLOT(config, "zxbus:1", 0, "zxbus", zxbus_cards, nullptr);
+	ZXBUS_SLOT(config, "zxbus:1", 0, zxbus, zxbus_cards, nullptr);
 
 	const rectangle scr_full = { SCR_320x256.left() - 16, SCR_320x256.right() + 16, SCR_320x256.top() - 8, SCR_320x256.bottom() + 8 };
 	m_screen->set_raw(28_MHz_XTAL / 2, CYCLES_HORIZ, CYCLES_VERT, scr_full);
diff --git a/src/mame/sinclair/sprinter.cpp b/src/mame/sinclair/sprinter.cpp
index 20fdadf96cce5..39a65c76a33d7 100644
--- a/src/mame/sinclair/sprinter.cpp
+++ b/src/mame/sinclair/sprinter.cpp
@@ -46,7 +46,6 @@ Sprinter Sp2000 (Peters Plus Ltd)
 #include "bus/pc_kbd/pc_kbdc.h"
 #include "bus/rs232/hlemouse.h"
 #include "bus/rs232/rs232.h"
-#include "bus/spectrum/zxbus.h"
 #include "cpu/z80/z84c015.h"
 #include "machine/ds128x.h"
 #include "sound/ay8910.h"
@@ -79,7 +78,7 @@ class sprinter_state : public spectrum_128_state
 	sprinter_state(const machine_config &mconfig, device_type type, const char *tag)
 		: spectrum_128_state(mconfig, type, tag)
 		, m_maincpu(*this, "maincpu")
-		, m_isa(*this, "isa%u", 0U)
+		, m_isa(*this, "isa8%u", 0U)
 		, m_rtc(*this, "rtc")
 		, m_ata(*this, "ata%u", 1U)
 		, m_beta(*this, BETA_DISK_TAG)
@@ -1709,7 +1708,7 @@ INPUT_PORTS_START( sprinter )
 	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CAPS SHIFT") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT)  PORT_CHAR(UCHAR_SHIFT_1) PORT_CHAR(UCHAR_SHIFT_2)
 	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("z    Z    :      LN       BEEP   COPY") PORT_CODE(KEYCODE_Z)      PORT_CHAR('z') PORT_CHAR('Z') PORT_CHAR(':')
 																	 PORT_CODE(KEYCODE_BACKSLASH)
-	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("x    X    $      EXP      INK    CLEAR") PORT_CODE(KEYCODE_X)   PORT_CHAR('x') PORT_CHAR('X') PORT_CHAR(U'£')
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("x    X    $      EXP      INK    CLEAR") PORT_CODE(KEYCODE_X)     PORT_CHAR('x') PORT_CHAR('X') PORT_CHAR('$')
 	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("c    C    ?      LPRINT   PAPER  CONT") PORT_CODE(KEYCODE_C)      PORT_CHAR('c') PORT_CHAR('C') PORT_CHAR('?')
 	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("v    V    /      LLIST    FLASH  CLS") PORT_CODE(KEYCODE_V)       PORT_CHAR('v') PORT_CHAR('V') PORT_CHAR('/')
 																	 PORT_CODE(KEYCODE_SLASH) PORT_CODE(KEYCODE_SLASH_PAD)
@@ -1893,13 +1892,11 @@ void sprinter_state::sprinter(machine_config &config)
 
 	ISA8(config, m_isa[0], X_SP / 5);
 	m_isa[0]->set_custom_spaces();
-	zxbus_device &zxbus(ZXBUS(config, "zxbus", 0));
-	zxbus.set_iospace(m_isa[0], isa8_device::AS_ISA_IO);
-	ZXBUS_SLOT(config, "zxbus2isa", 0, "zxbus", zxbus_cards, nullptr);
+	ISA8_SLOT(config, "isa0", 0, m_isa[0], pc_isa8_cards, "zxbus_adapter", false);
 
 	ISA8(config, m_isa[1], X_SP / 5);
 	m_isa[1]->set_custom_spaces();
-	ISA8_SLOT(config, "isa8", 0, m_isa[1], pc_isa8_cards, nullptr, false);
+	ISA8_SLOT(config, "isa1", 0, m_isa[1], pc_isa8_cards, nullptr, false);
 
 	m_screen->set_raw(X_SP / 3, SPRINT_WIDTH, SPRINT_HEIGHT, { 0, SPRINT_XVIS - 1, 0, SPRINT_YVIS - 1 });
 	m_screen->set_screen_update(FUNC(sprinter_state::screen_update));
diff --git a/src/mame/sinclair/tsconf.cpp b/src/mame/sinclair/tsconf.cpp
index 5df2573f83007..194d05506da62 100644
--- a/src/mame/sinclair/tsconf.cpp
+++ b/src/mame/sinclair/tsconf.cpp
@@ -279,9 +279,8 @@ void tsconf_state::tsconf(machine_config &config)
 	m_maincpu->set_vblank_int("screen", FUNC(tsconf_state::tsconf_vblank_interrupt));
 
 	zxbus_device &zxbus(ZXBUS(config, "zxbus", 0));
-	zxbus.set_iospace("maincpu", AS_IO);
-	ZXBUS_SLOT(config, "zxbus1", 0, "zxbus", zxbus_cards, nullptr);
-	//ZXBUS_SLOT(config, "zxbus2", 0, "zxbus", zxbus_cards, nullptr);
+	ZXBUS_SLOT(config, "zxbus1", 0, zxbus, zxbus_cards, nullptr);
+	//ZXBUS_SLOT(config, "zxbus2", 0, zxbus, zxbus_cards, nullptr);
 
 	m_ram->set_default_size("4096K");